J. M. Vargas Jr., R. Detweiler and C. Bilgrien Department 6f Botany and Plant Pathology, M.S.U. Snow Mold Fungicide Trials

Transcription

1 New Fungicides fr Anthracnse Cntrl, Fungigatin, Fairway Yellwing, and Chemical Cntrl f Typhula blight, Helminthsprium melting-ut, and Sclertinia dllarspt. J. M. Vargas Jr., R. Detweiler and C. Bilgrien Department 6f Btany and Plant Pathlgy, M.S.U. Snw Mld Fungicide Trials - -0 The -0 snw mld fungicide trials were cnducted at the Byne Highlands Resrt n Penncrss creeping bentgrass mwed at / inch. Treatments were applied t 6 feet x feet plts in three replicatins f a randm blck design n Octber,. The wettable pwders and flwables were applied with a small-plt C0 sprayer at a vlume f 0 gal/acre. The granular applicatins were made with a ft Sctt's drp-type spreader. The plt ratings were taken n April, 0 (Tables, and ). Results Temperatures were mderate up thrugh mid-december,. This was fllwed by freezing temperatures befre the snw fell in mid-january. Therefre, when the snw fell it was n frzen grund. Under these cnditins, the tw prevalent snw mlds were Typhula blight caused by Typhula ishikarensis, and Fusarium patch caused by Fusarium nivale. The majrity f the Typhula blight in the Harbr Springs area has been due t Typhula incarnata ver the past years. Perhaps the frzen grund prir t snw fall caused the ppulatin shift. There was als mre Fusarium patch than in previus years. The PCNB prducts (Pr Turf F+FII, Acti-dine RZ, and Terraclr W), the mercury fungicides (Cal-clr, Cal-gran), and the Dacnil cmbinatin prducts (Dacnil plus Tersan r Chipc 60) were the highest ranking fungicides f thse that gave significant ttal snw mld reductin cmpared t the untreated cntrl. In tables and when the specific snw mlds are factred-ut, Dacnil and CGA-6 are seen t have activity against Typhula blight but nt Fusarium patch. 0

2 Table. Percent Area Infected With All Snw Mlds. Typhula Blight (Typhula ishikarensis) and Fusarium Patch (Fusarium nivale) in Byne Highlands Snw Mld Fungicide Trials -0. Replicatin Treatment Rate/000 ft I II III AVE DMR (%) Pr Turf F+FII X 0 0. A Acti-dine RZ z. a. A Cal-clr z.. A Cal-gran 6 lbs.. A Dacnil (00) + fl. z. + z Tersan Dacnil (WP) + z. + z.. Tersan Terraclr W z.. C Dacnil (WP) + z. + z C Tersan Dacnil (00) 6 fl. z. 0 0 CD Dacnil (WP) + z. + z. CD Chipc 60 Dacnil (00) + fl. z. + z CD Tersan Dacnil (00) + 6 fl. z. + 6 z. 6. CD Chipc 60 Dacnil (wp) z CD BFN 0 -fl. z CD Dacnil (00) fl. z. 0. CD CGA-6 0 gm. ai. 0. CD Dacnil (00) fl. z CD Tersan SP z CD Pr Turf Brad Spectrum X CD Chipc 60 z. 0. CD Dacnil (00) + 6 fl. z. + z. Cp Tersan BFN 0. fl. z. 60 CD Bayletn + Dyrene z. + 6 z. 0 0 CD Bayletn z CD CGA-6 0 gm. ai CD Bayletn 6 z. 60. BCDE Chipc 60 6 z. 0. CDE Bayletn 0 z. 0 0 CDE Bayletn z DE Dacnil (WP) z DE Check E Nte: All treatments fllwed by the same letter are nt significantly different frm each ther at the % level f significance.

3 Table. Percent Area Infected With Typhula Blight (Typhula ishikarensis) in Byne Highlands Snw Mld Fungicide Trials -0. Replicatin Treatment Rate/l000 ft I II III AVE DMR (%) Dacnil (00) 6 fl. z A Dacnil (00) fl. z A Cal-clr Z A CGA-6 0 gm. ai A Cal-Gran 6 lbs. 0 0 A Acti-dine RZ z 0 0. A Pr Turf F+FII X 0 0 A Dacnil (wp) z Dacnil (WP) + z. + z. 0. Tersall Dacnil (00) + fl. z. + z Tersan Bayletn 0 z. a a. Terraclr z. a CGA-6 0 gm. ai. a a 0 Bayletn z. a Bayletn + Dyrene z. + 6 z Dacnil + 6 fl. z. + z.. (00) Tersan Dacnil (WP) + Tersan z. + z Dacnil (00) fl. z. 0. Dacnil (00) + 6 fl. z. + 6 z. 0 Chipc 60 Dacnil (WP) + z. + z. Chipc 60 Dacnil (00) + fl. z. + z Tersan Dacnil (WP) z BFN 0 fl. z Chipc 60 z C Chipc 60 6 z C Bayletn z. 0. C Bayletn 6 z. 0.. C Tersan SP z C Pr Turf Brad Spectrum X C BFN 0. fl. z. 60 BC Check C Nte: All treatments fllwed by the same letter are nt significantly different frm each ther at the % level f significance.

4 Table. Percent Area Infected With Fusarium Patch (Fusarium nivale) in Byne Highlands Snw Mld Fungicide Trials -0. Replicatin Treatment Rate/l000 ft I II III AVE DMR(%) Dacnil (00) + fl. z. + z A Tersan Dacnil (wp) + z. + z A Tersan BFN 0. fl. z A BFN 0 fl. z A Dacnil (WP) + z. + z A Chipc 60 Tersan SP z a A Pr Turf F+FII X 0 a 0 a A Pr Turf Brad Spectrum X A Acti-dine RZ z 0 0. A Terraclr z. 0 a A Dacnil (00) + fl. z. + z Tersan Dacnil (WP) + fl. z. + z Tersan Cal-clr z.. Dacnil (00) + 6 fl. z. + 6 z Chipc 60 Dacnil (00) + 6 fl. z. + z Tersan Cal-Gran 6 lbs. 0 Chipc 60 z. 0 0 C Dacnil (00) fl. z CD Bayletn z CD Dacnil (00) 6 fl. z CD Dacnil (WP) z CD Bayletn 6 z. 0 a. CD Bayletn + Dyrene z. + 6 z CD Chipc 60 6 z. 0 0 CD Check CD CGA-6 0 gm. ai. 0. ed CGA-6 0 gm. ai CD Dacnil (00) fl. z CD Dacnil (WP) z BCD Bayletn 0 z CD Bayletn z D Nte: All treatments fllwed by the same letter are nt significantly different frm each ther at the % level f significance.

5 Helminthsprium (Melting-Out) Fungicide Study - 0 The 0 Helminthsprium melting-ut (Helminthsprium vagans) fungicide study was cnducted at the MSU Sils Research Farm n Park Kentucky bluegrass maintained at a -/ inch height f cut. Fungicide treatments were applied n a bi-weekly schedule n May 6, May and June, except as nted n the data charts. All materials were applied with a C0 small-plt sprayer at a vlume f 0 gal/acre. The plts were feet x 6 feet and were replicated three times in a randmized blck design. The plts were rated n June 0. Results and Cnclusins There was severe Helminthsprium melting-ut disease pressure during the spring f 0. Many fungicides which nrmally have ratings f and had much higher ratings. Only fur chemicals under this severe pressure gave significant cntrl cmpared t the untreated check: Chipc 60 at the z rate, CGA-6 at the and gm ai (active ingredient) rate and Acti-dine RZ at the. z rate. Table. MSU Sils Farm Helminthsprium Melting-Out - Fungicide Study Disease Infectin Rating - Scale - (, n disease;, severe disease). Rating Taken - 6/0/0 Replicatin Treatment Rate/000 ft I II III AVE DMR Chipc 60 z. A CGA 6 gm. ai. A CGA 6 gm. ai.. A Acti-dine RZ. z.. Dacnil 00 6 fl. z. C Dacnil 00 fl. z. 6. C KL gm. + fl. z./00 gal.. C Bifilm* KL -0-0*.6 gm. 6. C Bifilm* fl. z./00 gal.. C Acti~d.ine TGF.6 z. 6 C Hydrated Lime + lb. + lb. 6 C Pwder Blue KL -0-0*.6 gm. 6. C KL gm. + fl. z./00 gal.. BC Bifilm* Check 6. C Nte: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level. *Received nly treatments, n May and June.

6 Helminthsprium Melting-Out Acti-Dine Fungicide Study 0 Hartland Glen Glf Curse, Hartland, MI The 0 Up-Jhn Acti-dine melting-ut study was cnducted n a Barn Kentucky bluegrass fairway at Hartland Glen Glf Curse in Hartland, MI. On May, the entire plt area, except fr the check plts, was treated with a tank mix cmbinatin f Acti-dine RZ ( z/a) and Acti-dine TGF ( z/a). In subsequent weeks, Acti-dine RZ ( z/a) was applied at weekly, bi-weekly, tri-weekly and mnthly intervals in replicatins each. These applicatins cntinued thrugh June, at which time the weekly plts had received Acti-dine RZ treatments, the bi-weekly plts had received treatments, the tri-weekly plts had received treatment, and the mnthly plts had received treatment. The three remaining Acti-dine RZ + Acti-dine TGF treated plts received n additinal treatments after May. All treatments were applied with a C0 small-plt sprayer at a vlume f 0 gal/a. The plts were rated n June (Table ). Results and Cnclusins The acti-dine RZ treatments all gave significant cntrl ver the untreated check except the Acti-dine mnthly applicatin which received ne additinal treatment after the initial Acti-dine RZ and Acti-dine TGF treatment n May. There appears t be merit in further investigatin f this prgram n a mre susceptible Kentucky bluegrass cultivar t see if there are greater differences amng treatments. Table. Hartland Glen Helminthsprium Melting-Out - Fungicide Study 0 Disease Infectin Rating - Scale - (, n disease;, severe disease). Rating Taken - 6//0 Treatment Rate/acre Replicatin I II III AVE DMR Acti-dine RZ (weekly) z./a. A Acti-dine RZ (biweekly) z./a. Acti-dine RZ + z./a + z./a 6 Acti-dine TGF (nce nly) Acti-dine'RZ (triweekly) z./a 6. Acti-dine RZ (mnthly) z./a. Be Cntrl C Nte: Treatments fllwed by same letter are nt significantly different frm each ther at the % level.

7 Dllarspt Fungicide Studies - 0 Tw Sclertinia dllarspt (Sclertinia hmecarpa) studies were cnducted, ne n an annual bluegrass fairway and the ther n a Trnt creeping bentgrass green. Liquid applicatins were made with a C0 small-plt sprayer at a vlume f 0 gal/acre. Granular frmulatins were applied with a Sctts ft drp-type spreader. Bth studies were laid ut in three replicatins f a randm blck design. The annual bluegrass Sclertinia dllarspt study was cnducted at Burrughs Farms Glf Curse in Brightn, MI, n an irrigated Pa annua fairway maintained at / inch height f cut. Treatments were applied preventatively t 6 feet x feet plts n July, July, August, and September, except as nted n the data charts. The Sclertinia dllarspt ratings were taken n September. The Trnt creeping bentgrass dllarspt study was cnducted at the MSU Crps and Sils Field Labratry n an irrigated putting green which was infected prir t treatment. Treatments were applied curatively n September 0 and September. The dllarspt ratings were made n September. Results and Cnclusins Trnt Creeping Bentgrass Sclertinia Dllarspt Study Table 6 shws the mst effective fungicides fllwing tw fungicide applicatins at a day interval. The dllar spt infestatin was exceptinally heavy this seasn. The entire plt areas in the untreated check and ineffective fungicide plts became almst cmpletely cvered by the disease. The systemic fungicides and cmbinatin (systemic and cntact) fungicides gave the best cntrl under the severe disease pressure. Thse treatments giving significant cntrl ver the untreated check were: F-, F-, F-, F-, Brmsan z, Cleary 6 and z, Fung SOland z, Tersan and z, IBDU + Bayletn. and.0 z ai, Bayletn z and. z ai, Chipc 60 z, Bayletn and Acti-dine TGF. z ai +. z, CGA-6 and gm ai, Dusan. and 6.6 z, Rnilan z, Dacnil Fl 6 fl z and fl z, Acti-dine TGF.6 z, Dacnil WP. OZ, Acti-dine TGF + Dacnil WP. z +. z. Annual Bluegrass Sclertinia Dllarspt Study The Sclertinia dllar spt infectin was als heavy in the preventive study at Burrughs Farms. CGA-6 at and gm ai, IBDU + Bayletn at. and.0 z ai, F-, F-, F-, Bayletn z and. z ai, Rnilan OZ, Brmsan OZ, Dusan 6.6 OZ, Dacnil GR. OZ, and. OZ, Fung 0 and OZ, Tersan and z, Bayletn + Acti-dine TGF. z ai +. OZ, Chipc OZ, Cleary 6 and OZ, Acti-dine TGF + Dacnil WP. z +. z all gave significant cntrl cmpared t the untreated check (Table ). The applicatins were made n day and greater intervals which may have favred the systemic fungicides ver the cntact fungicides. 6

8 Table 6. 0 Dllarspt Fungicide Study - Creeping Bentgrass Crp and Sils Field Labratry, East Lansing, MI Disease Rating -, n disease;, severe disease. //0 Treatment Rate/l000 ft Replicatin I II III AVE DMR (%) F- F- Brmsan Cleary 6 Cleary 6 Fung 0 Tersan Bayletn + IBDU Bayletn Tersan Chip c 60 Fung 0 Bayletn + IBDU Bayletn + Acti-dine TGF CGA-6 Dusan Dusan Rnilan CGA-6 F- Dacnil FL Dacnil FL Bayletn Acti-dine TGF Dacnil WP F- F- Acti-dine TGF + Dacnil WP Acti-dine TGF Dacnil WP Kal -0-0 Check Bifilm Pwder Blue + Hyd. Lime Kal -0-0 Kal + Bifilm Kal + Bifilm X X z. z. z. z. z.. z. ai./ lbs. z. z. z. z.. z. ai./ lbs.. z. ai. +. z. gm. ai.. z. 6.6 z. z. gm. ai. X 6 fl. z. fl. z.. z. ai..6 z.. z. X IX. z. +. z.. z.. z..6 gm. fl. z./00 gal. lbs. + lb..6 gm..6 gm. + fl. z./00 gal..6 gm. + fl. z./00 gal A A C C C C C BCD BCD CDE DEF EF EF EF EF EF FG FG GH GH H H H H H Nte: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level.

9 Table. 0 Dllarspt Fungicide Study - Pa annua Burrughs Farms Glf Curse, Brightn, MI Disease Rating -, n disease;, severe disease. //0. Treatment Rate/l000 ft Replicatin I II III AVE DMR (%) CGA-6 Bayletn + IBDD Tersan Bayletn + IBDD F- Bayletn Rnilan Brmsan Dusan F- Dacnil GR F-* Fung 0 Dusan Fung 0 Bayletn + Acti-dine TGF Chipc 60 Cleary 6 F-* Dacnil GR F- Tersall Bayletn CGA-6 Acti-dine TG + Dacnil WP Cleary 6' F- Dacnil FL Kal -0-0 Dacnil GR Dacnil FL Kal + Bifilm F- Acti-dine TGF Acti-dine TGF al -0-0 Dacnil.WP Check, Pwder Blue + Hyd. Lime Biflim Kal + Bifilm Dacnil 'WP gm. ai.. z. ai./.6 lbs. z.. z. ai./.6 lbs. X z. z. z. 6.6 z. X. z. X z.. z. z.. z. ai. +. z. z. z. IX. z. IX z.. z. ai. gm. ai.. z. +. z. z. X 6 fl. z..6 gm..6 z. fl. z..6 gm. + fl. z./00 gal. X. z..6 z..6 gm.. z. lb. + lb. fl. z./00 gal..6 gm. + fl. z./00 gal.. z A A A A A A A. A. A. A. A. A.. C C C C. CD. CDE. CDE. CDE. CDE. CDE. CDEF. CDEF. BCDEFG. BCDEFG. BCDEFG. CDEFGH DEFGH. EFGHI. FGHIJ 6 FGHIJ 6 FGHIJ 6 FGHIJ 6. GHIJ 6. GHIJ 6. GHIJ. HIJ IJ. J Nte: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level. * - was nt applied n September.

10 Acti-dine TGF - Dacnil WP Cmbinatin Dllarspt Study - 0 This efficacy, phyttxicity and cmpatibility study was cnducted n a dllarspt (Sclertinia hmecarpa) infected Trnt creeping bentgrass green n the Crps and Sils Field Labratry, Michigan State University, East Lansing, MI. The green received / lb. nitrgen/looo sq. ft. fr the seasn weeks frm the initiatin f the study. The green was mwed at a / inch height three times a week and irrigated n an as needed basis. The study was replicated three times in a randm blck design with treatments being applied curatively n September, September, September and September. The treatments were applied t feet x 6 feet plts with a C0 small-plt sprayer at a vlume f 0 gal./acre. Disease pressure was mderately heavy thrughut the duratin f the study. The plts were rated n September 6~ fllwing the secnd applicatin and n Octber, fllwing the furth applicatin. Results and Cnclusins The results in Table shw that after applicatins ( days apart) all treatments gave significant cntrl ver the untreated check althugh nt cmplete cntrl. Table shws that after fur fungicide applicatins, with the lngest applicatin interval being 0 days, all treatments again gave significant cntrl ver the untreated check with Acti-dine TGF OZ, Acti-dine TGF OZ, Dacnil WP OZ, and Bayletn. z ai, all cmpletely eliminating the disease.

11 Table. Acti-dine TGF - Dacnil WP Cmbinatin Dllarspt Study MSU Crps and Sils Field Labratry Disease Rating -, n disease;, severe disease. /6/0. Replicatin Treatment Rate/l000 ft I II III AVE DMR (%) Acti-dine TGF* z. A Bayletn. z. ai. A Acti-dine TGF + Dacnil Wp* z. + z.. Dacnil WP z.. Acti-dine TGF* z.. Dacnil WP z. B Acti-dine TGF + Bayletn z. +. z. ai. B Check C Ntes: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level. *Phyttxicity bserved n Acti-dine TFG plts at z. and z. rates, as well as in cmbinatin with Dacnil WP. N phyttxicity bserved in cmbinatin with Bayletn. N cmpatibility prblems were encuntered. Table. Acti-dine TGF - Dacnil -WP Cmbinatin Dllarspt Study MSU Crps and Sils Field Labratry Disease Rating -, n disease;, severe disease. 0//0. Replicatin Treatment Rate/l000 ft I II III AVE DMR (%) Acti-dine TGF* z. I A Acti-dine TGF* z. I A Dacnil z. A Bayletn. z. ai. I A Acti-dine TGF + Bayletn z. +. z. ai.. Acti-dine TFG + Dacnil WP* z. + z.. Dacnil WP z. B Check I 6 6. C Ntes: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level. *Phyttxicity bserved n Acti-dine TFG plts at I z. and z. rates, as well as in cmbinatin with Dacnil WP. N phyttxicity bserved in cmbinatin with Bayletn. N cmpatibility prblems were encuntered.

12 Dacnil-Rnilan Cmbinatin Dllarspt Study - 0 The Dacnil FL - Rnilan cmbinatin dllarspt (Sclertinia hmecarpa) study was cnducted at the Crps and Sils Field Labratry in East Lansing, MI, n an irrigated Trnt creeping bentgrass putting green. The plt was laid ut in three replicatins f a randm blck design. The entire plt area was unifrmly infected with dllarspt at the time f treatment. Treatments were applied curatively t feet x 6 feet plts n August, September, Septmber and September. All treatments were applied with a C0 small-plt sprayer at a vlume f 0 gal./acre. The ratings were taken n Octber (Table 0). Results and Cnclusins All treatments gave significant cntrl cmpared t the untreated check. Rnilan alne r in cmbinatin with Dacnil ranked higher than Dacnil alne. The,, and day spray intervals under the severe disease pressure prbably accunted fr Rnilan's higher ranking. Dacnil FL Gallnage Study - 0 The Dacnil FL gallnage study was cnducted n an irrigated Trnt creeping bentgrass putting green at the MSU Crps and Sils Field Labratry in East Lansing, MI. The plt area was unifrmly infected with dllarspt (Sclertinia hmecarpa) prir t treatment. Treatments were applied curatively t feet x 6 feet plts in three replicatins f a randm blck design. Treatments were made n August, August, September and September using a C0 small-plt sprayer. The ratings were taken n September (Table ). Results and Cnclusins All rate and gallnages gave significant cntrl cmpared t the untreated cntrl. The 6 z/000 sq ft rate gave better, if nt always significant, cntrl at the % level than the z/000 sq ft rates. The nly treatment giving significant cntrl ver all f the z Dacnil rates was Dacnil 6 z/000 sq ft rate in gal f water. Apprximately week intervals were used in this study which pushed Dacnil t its limits under the severe dllar spt pressure, but under such stress there is a trend that indicates Dacnil at the 6 z/000 sq ft rate is mre effective when applied with lwer water gallnage. All treatments gave significant cntrl cmpared t the untreated check. This study was initiated earlier than the Acti-dine - Dacnil - Bayletn study (Table ) and received the same number f treatments, the majr difference being the lnger interval between applicatin in this study (6, and days) versus the shrter (, and 0 days) intervals in the Acti-dine - Bayletn - Dacnil study. Dacnil gave cntrl at the + z/000 sq ft rate at shrter intervals (Table ) cmparable t the and 6 z/000 sq ft at lnger intervals (Table ). The lnger intervals in the Dacnil - Rnilan study shw similar results with Dacnil (Table 0). All studies were cnducted n the same green.

13 Table 0. Dacnil FL - Rnilan Cmbinatin Dllarspt Study MSU Crps and Sils Field Labratry Disease Rating -, n disease;, severe disease. 0//0 Replicatin Treatment Rate/IOOO ft I II III AVE DMR (%) Rnilan z. I I A Rnilan + Dacnil FL z. + fl. z. A Rnilan z.. Rnilan + Dacnil FL z. + fl. z.. Dacnil FL 6 fl. z. B Dacnil FL fl. z.. C Check. D Nte: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level. Table. Dacnil FL Gallnage Dllarspt Study MSU Crps and Sils Field Labratry Disease Rating -, n disease;, severe disease. //0. Replicatin Treatment Rate/l000 ft I II III AVE DMR (%) Dacnil FL 6 fl. z./ gal. A Tersan z./ gal. A Dacnil FL 6 fl. z./ gal.. Dacnil FL 6 fl. z./ gal.. Dacnil FL 6 fl. z./6 gal.. Dacnil FL 6 fl. z./ gal. C Dacnil FL fl. z./ gal.. BCD Dacnil FL fl. z./ gal.. BCD Dacnil FL fl. z./6 gal. CD Dacnil FL fl. z./ gal.. DE Dacnil FL fl. z./ gal. E Check F Nte: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level.

14 Anthracnse - Fungicide Studies - 0 The 0 anthracnse (Cllettrichum graminicla) fungicide studies were cnducted n the Bay Pinte Glf Club in West Blmfield, MI, and n the EI Drad Glf Curse in Masn, MI, n irrigated annual bluegrass fairways maintained at a / inch height f cut. The studies were laid ut in three replicatins f a randmized blck design. The liquid applicatins were made with a C0 small-plt sprayer at a vlume f 0 gal./acre while the granular frmulatins were applied with a Sctts ft drp-type spreader. The plt size was 6 feet x feet. Treatments were applied curatively at EI Drad als, n August and August. The ratings were taken n September. Results and Cnclusins Bay Pinte Glf Club Anthracnse Study The July 0 fungicide applicatins were made prir t the presence f any bservable disease symptms. N additinal treatment was made until August. The next scheduled treatment was fr July, but was nt applied because n evidence f the disease was present. Anthracnse did develp the week f August and all treatments were applied n August, with sel~cted cntact fungicides (as indicated n chart) applied a week later n August. Ratings were taken n August and September (Tables and ). It can be seen that effective fungicides which cntrl anthracnse will allw annual bluegrass survival during heat stress perids f the summer. EI Drad Glf Curse, Masn, MI Ratings were based n % imprvement since fungicide treatments were applied after disease utbreak. Thse treatments receiving minuses indicate hw much the disease increased in thse treatments. Fr example, the check which received n treatment had a % increase in the amunt f disease frm the start f the experiment n August t September when the readings were taken. The plt area was predminately annual bluegrass with 0-0% Kentucky bluegrass interspersed as patches. This affected the unifrmity f turf and f infectin. Only annual bluegrass areas in the plts were evaluated. The statistics reflect the variatin amng treatments by shwing n significant difference between 6.% imprvement in turf recvery and % imprvement. The data shw that fungicide treatment can cntrl an anthracnse epidemic and allw annual bluegrass recvery whereas the untreated annual bluegrass cntrl cntinued t deterirate. Thse prducts which were mst effective in stpping the anthracnse epidemic were: the benzimidazle systemic fungicides (Brmsan, Dusan, Fung 0, Tersan, Cleary's 6), prducts cntaining the systemic fungicide Bayletn (F-numbered cmpunds except F-, which cntained nly fertilizer, IBDU fertilizer + Bayletn, Bayletn + Acti-dine TGF and Bayletn alne), the systemic fungicide CGA-6, r certain rates f Dacnil (Table ). Similar trends can be Seen in the anthracnse data taken at Bay Pinte Glf Club (Tables and ) except that Rnilan, which had ne preventive treatment, als ranked amng the tp treatments.

15 Table. Anthracnse - Fungicide Study - 0. Bay Pinte Glf Curse, Unin Lake, MI. % Area Infected - // Treatment Rate/000 ft Replicatin I II III AVE DMR (%) F- X. A F- IX 0. Bayletn z.. Bayletn +.6 lbs. 0 C IBDU (. z. ai.) Bayletn +.6 lbs C IBDU (. z. ai.) CGA-6 gm. ai. 6 CD F- X CD F- IX 0. CD F- X 0 CD CGA-6 gm. ai. 0 CD Rnilan z. 0 0 CDE Fung 0 z CDE Tersan z. 0. CDE Dacnil GR. z. 0. CDEF F- X. CDEF Bayletn +. z. ai. +. z.. CDEF Acti-dine TGF Dusan 6.6 z. 6. CDEF Tersan z. 6. CDEF Cleary 6 z. 0 CDEF Dacnil GR. z. 0. Cleary 6 z. 0. Fung 0 z.. Dusan. z Dacnil GR. z Bayletn. z. ai Brmsan z. 0 Acti-dine TGF.6 z. 0 H Dacnil FL fl. z H Dacnil FL 6 fl. z. 6. HI F- X HI Dacnil WP. z. HI KL gm. 0 0 HI Acti-dine TGF +. z. +. z. 60 CDEFGHI Dacnil WP Kal + Bifilm.6 gm. + fl. z./00 gal DEFGHI Acti-dine TGF. z EFGHI Pwder Blue + lbs. + lb FGHI Hyd. Lime KL + Bifilm.6 gm. + fl. z./00 gal GHI Check 0 0. HI Bifilm fl. z./00 gal I Nte: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level.

16 Table. Anthracnse - Fungicide Study. Bay Pinte Glf Curse, West Blmfield, MI. % Area Infected - //0 Treatment Rate/000 ft Replicatin I II III AVE DMR (%) F- F- Bayletn Bayletn + IBDU (. z. ai.) Bayletn + IBDU (. z. ai.) CGA-6 F- F- F- CGA-6 Dusan Tersan Cleary 6 F- Rnilan Bayletn + Acti-dine TGF Brmsan Dusan Dacnil GR* Tersan Fung 0 Dacnil GR* Dacnil GR* Acti-dine TGF* Cleary 6 Bayletn Dacnil FL* Dacnil FL* Fung 0 Dacnil WP F- Acti-dine TGF + Dacnil Wp* Dacnil WP Chipc 60 Kal -0-0 Kal + Bifilm Kal + Bifilm Check Pwder Blue + Hyd. Lime Acti-dine TGF* Kal -0-0 Bifilm IX X z..6 lbs..6 lbs. gm. ai. X X IX gm. ai. 6.6 z. z. z. X z.. z. ai. +. z. z.. z.. z. z. z.. z.. z..6 z. z.. z. ai. fl. z. 6 fl. z. z.. z. X. z. +. z.. z. z..6 gm..6 gm. + fl. z./00 gal.. gm. + fl. z./00 gal. lbs. + lb.. z..6 gm. fl. z./00 gal A A C CD CD CD CD CDE CDE CDE CDEF CDEF H H H H H H H H H BCDEFGHI BCDEFGHI CDEFGHI DEFGHI EFGHI EFGHIJ EFGHIJ FGHIJ GHIJ HIJ HIJ IJ J Nte: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level. *Plts receiving an additinal treatment n August.

17 Table. Anthracnse - Fungicide Study. El Drad Glf Curse, Masn MI. Percent imprvement fllwing treatment - //0 Treatment Rate/000 ft Replicatin I II III AVE DMR (%) F- Brmsan Dusan Fung 0 Tersan F- F-* Bayletn CGA-6 Tersan F- Bayletn Cleary 6 Bayletn + AD-TGF Dacnil FL Dacnil GR Dusan Bayletn + IBDU (. z. ai.) Fung 0 Cleary 6 Dacnil GR F-* CGA-6 F- Dacnil FL Acti-dine TGF Chipc 60 Dacnil GR Bayletn + IBDU (. z. ai.) Rnilan Dacnil WP Acti-dine TGF + Dacnil WP Acti-dine TGF F- KL--0-0 Pwder Blue + Hyd. Lime KL- + Bifilm Dacnil WP KL--0-0 Bifilm KL + Bifilm Check X z.. z. z. z. X X. z. ai. gm. ai. z. X z. z.. z. ai. +. z. 6 fl. z.. z. 6.6 z..6 lbs. z. z.. z. IX gm. ai. IX fl. z.. z. z.. z..6 lbs. z.. z.. z. +. z..6 z. X.6 gm. lbs. + lb..6 gm. + z./00 gal.. z..6 gm. z./00 gal..6 gm. + z./00 gal a a a. a A A C C CD CD CDE CDE CDE CDE CDE CDE CDE CDEF CDEF CDEF CDEF CDEF CDEF CDEF CDEF CDEF BCDEFG CDEFG DEFG EFG FG FG Nte: Treatments fllwed by the same letter are nt significantly different frm ~ach ther-at the % level. *Received nly ne treatment. 6

18 Anthracnse - Nitrgen Fertility Timing and Carrier Study - 0 Burrughs Farms Glf Curse, Brightn, MI The lng term disease-fertility plts were established n an irrigated / inch mwed annual bluegrass fairway. All fertilizer applicatins were made as indicated in Tables and 6. The anthracnse (Cllettrichum graminicla) ratings were taken n the same plts n September, 0. N fungicides were applied n these plts. Results and Cnclusins Sulfur Cated Urea Timing - Anthracnse Study There were n significant differences amng treatments. The n nitrgen cntrl plts unfrtunately received a -/ Ib/l000 sq ft applicatin f Milrganite n June, 0. Nitrfrm - Urea - Anthracnse Study The plts receiving mst f their nitrgen in the early spring and late summer treatment had mre anthracnse than thse receiving their nitrgen primarily in the summer and drmantly.

19 Table. Sulfur Cated Urea Timing - Anthracnse Study - 0. Burrughs Farms Glf Curse, Brightn, MI Percent area infected with anthracnse - //0 Replicatin Treatment I II III AVE DMR (%) Sulfur Cated Urea (Special) 0 A. Check 0 0 A. Sulfur Cated Urea A. Sulfur Cated Urea 0 0. A. Sulfur Cated Urea A Ntes: Treatments & : June '0 July '0 Aug. '0 Sept. '0 Nv. ' / lb. N. / lb. N. / lb. N. lb. N. lb. N. Treatment : Treatment : Treatment : April '0 / lb. N. May '0 / lb. N. June '0 / lb. N. Sept. '0 / lb. N. April '0 lb. N. May '0 lb. N. June '0 lb. N. Sept. '0 lb. N. N nitrgen (Mistakenly treated with -/ lb. Milrganite/l000 ft n June, 0).

20 Table 6. Nitrfrm - Urea - Anthracnse Study 0. Burrughs Farms Glf Curse, Brightn, MI Percent area infected with anthracnse - //0. N fungicides applied. Treatment N. I Replicatin II III IV AVE DMR* 0 0 A 0 0. B Treatment : May '0 - lb. nitrgen (/ lb. pwder blue (nitrfrm), / lb. urea) June '0 - lb. nitrgen (/ lb. pwder blue (nitrfrm), / lb. urea). Sept. '0 - lbs. nitrgen ( lb. pwder blue (nitrfrm), lb. urea) Treatment : Nv. ' - lb. nitrgen (Urea). June '0 - / lb. nitrgen (/ lb. pwder blue (nitrfrm), / lb. urea). Aug. '0 - / lb. nitrgen (/ lb. pwder blue (nitrfrm), / lb. urea). Sept. '0 - lb. nitrgen (/ lb. pwder blue (nitrfrm), / lb. urea). Treatment : N nitrgen. *Treatments fllwed by the same letter are nt significantly different frm each ther at the % level.

21 Fusarium Blight Study - 0 The 0 Fusarium blight (Fusarium rseum) study was cnducted n the Hartland Glen Glf Curse, Hartland, MI, n an irrigated Barn Kentucky bluegrass fairway maintained at apprximately / inch height f cut (Tables and ). The study was placed n an area that had the disease the year befre and n which ld Fusarium blight scars were still present. Treatments were applied n July and July. The develpment f new rings was bserved shrtly after the first applicatin. Sme plts, including the experimental fertilizer-fungicide cmbinatins, were rated n July just prir t the secnd applicatin. The general fungicide study was nt rated because f nn-unifrm infictin and an verall lack f recvery in treated plts. Hwever, the entire area had recvered by mid-august, including the cntrl plts. The recvery frm Fusarium blight was attributed t the wet weather in late July and August. Results and Cnclusins There were n significant differences amng treatments due t recvery f initial Fusarium blight symptms. This recvery was believed t be due t the frequent rains which ccurred in late July and August. 0

22 Table. Hartland Glen Fusarium Blight Study -0. Experimental Ratings - Rating taken //0. Number f rings/plt.replicatin Treatment Rate Setting I II III IV AVE DMR (%) F- X A F- X A Check A F-66 IX A F-6 IX A F- IX 0 0. A F-6I IX. 0.. A Nte: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level. Table. Bayletn + IBDU Fusarium Blight Study - 0. Analysis -0-0, applied. lbs/looo ft Percent recvery after ne applicatin - //0. Replicatin Treatment Rate/lOOO ft I II III IV AVE DMR (%) Bayletn + IBDU. z. ai A Check A Bayletn + IBDU. z. ai A Nte: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level.

23 Hartland Fusarium Blight - Fertility Study - -0 The Hartland Fusarium Blight - Fertility study was cnducted n an irrigated Earn Kentucky bluegrass fairway mwed t a / inch mwing height in an area that had Fusarium blight the previus year. Established in Nvember, this study is a lng term investigatin f the effectiveness f varius nitrgen carriers and applicatin sequences fr the cntrl f Fusarium blight. The plts were read n July when new symptms began t appear. The wet weather that fllwed caused symptm develpment t cease and all plts recvered by late August. Results and Cnclusins These data are incnclusive since all treatments recvered befre severe idfectin ccurred. Als, at the time infectin ccurred, n plts had received ne full year f nitrgen treatments. Table. Fusarium Blight - Fertility Study Hartland Glf Curse, Hartland, MI. Treatment. BOU (ca rse). IBOU (fine).. Sul fur Sulfur Cated Cated Urea Urea (Special). Pwder Blue (Nitrfrm) + Urea 6. Pwder Blue (Nitrfrm) + Urea. Urea. Cntrl. Urea 0. IBDU (carse). Sulfur Cated Urea. Pwder Blue (Nitrfrm) + Urea. Urea r~nth/lbs'. N..per applicatin I N A M J J A s - - k k k - - k k k - k k k - - ~ k k k +~ - - k + k- ~ +~ k +~ ~ +~ - - k +~ / PB ~ Urea - -.~ ~ ~ ~ +~ ~+~ / +~

24 Table 0. Fusarium Blight - Fertility Study - 0. Hartland Glen Glf Curse, Hartland, MI. Number f Fusarium rings/plt - //0. Treatment II Replicatin I II III IV AVE. DMR A C 0 0. C 0 0. C 0. CD. CD 0.. BCD. CD. D Nte: Treatments fllwed by the same letter are nt significantly different frm each ther at the % level.

25 Glf Curse Fairway Fungigatin Efficacy Study - 0 Walnut Hills Glf Curse, East Lansing, Michigan The 0 fairway fungigatin study was cnducted n tw irrigated, annual bluegrass fairways ( & ) mwed at a / inch cutting height n the Walnut Hills Glf Curse in East Lansing, Michigan. Undiluted Dacnil flwable (FI) 00 fungicide was injected at a rate f apprximately gallns/hur directly int the irrigatin line using a Hydrfl chern-injectr (Hydrfl Crp., Maple Ave., Dublin PA ). Dacnil FI was applied at a qts/acre rate t the fairways based n the irrigatin system with a 00 galln/minute pump with Tr 66 tw speed individual irrigatin heads set n a minute cycle which delivers 60 gallns f water/minute and /0 inch precipitatin/hur. Dacnil FI fungigatin applicatins were made n May, June, June 6, July, August and August. Treatments were applied n an as needed basis with the mid-summer spray intervals being shrtened due t Sclertinia dllars pt (Sclertinia hmecarpa) and Anthracnse (Cllettrichum graminicla) pressure. Tw adjacent fairways received a similar treatment, qts/acre rate f Dacnil Fl n May, June, July, August and August applied with a Jhn Bean sprayer at the qts/acre rate with an utput f gallns/acre. Results and Discussin Sclertinia dllarspt and anthracnse were the nly tw diseases bserved n the Pa annua fairways during the summer perid. A mild utbreak f Fusarium patch (Fusarium nivale) ccurred in May. Dacnil FI applied thrugh the irrigatin system gave disease cntrl cmparable t Dacnil FI applied the mre cnventinal grund sprayer applicatin methd.