New Herbicides and New Approaches to Weed Control Fred Yelverton, PhD
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1 New Herbicides and New Approaches to Weed Control Fred Yelverton, PhD
2 TurfFiles Find this presentation and more online Sign-up for Turf ALERTS Learn about turfgrass pests: Weeds Insects Diseases Identify your turf or weed species using Decision Aids
3 TurfFiles
4 Old Herbicides EPA Proposed Bans: MSMA, DSMA, CMA Triazine herbicides
5 Sulfonylurea Herbicides (SUs) Metsulfuron (Manor/Blade) Chlorsulfuron (Corsair) Halosulfuron (Manage) foramsulfuron (Revolver) rimsulfuron (Tranxit) sulfosulfuron (Certainty) Trifloxysulfuron (Monument) Flazasulfuron
6 Other New Herbicides Bispyribac (Velocity) Carfentrazone (Quicksilver) Sulfentrazone (Dismiss) Quinclorac (Drive) Fluoxypyr (in various 3-ways) Mesotrione (????) Echelon (Dismiss + Prodiamine)
7 Manage now sold by SedgeHammer Was sold by Monsanto now sold by Gowan Same product
8 QuickSilver 1.9L (carfentrazone)
9 Winter Weed Management Not Overseeded
10 Princep 1 lb ai /A AAtrex 1 lb ai / A Roundup Pro 1 lb ai / A Treated Dec 22, 2003 Photo Feb 5, 2004
11 Common and hybrid bermudagrass
12 % Control Bermudagrass Control One Year After Treatment Roundup 2 qts/a 1 Application 2 Applications 3 Applications Roundup + Fusilade 2 qts + 24 fl oz/a Roundup + Envoy 2 qts + 34 fl oz/a Roundup + Finale 2 qts + 4 qt/a
13 % Control Tifway 419 Control in El Toro Zoysiagrass (12 WAIT) a 84 ab 60 bcd 38 de Fus II 4 oz + TE 1 qt 4wks Fus II 4 oz + TE 1 qt 8wks AE 1.25 pt + TE 1 qt 4wks AE 1.25 pt + TE 1 qt 8wks Nontreated f Rates are product / acre, data collected , Sandhills Research Station
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15 Weeds Controlled by Mesotrione Large crabgrass (Digitaria sanguinalis) Smooth crabgrass (Digitaria ischaemum) Henbit (Lamium amplexicaule) Broadleaf plantain (Plantego major) Yellow woodsorrel (Oxalis stricta) Goosegrass (Eleusine indica) St. Augustine, Centipede are tolerant, bermuda is not
16 Tolerance Trials Mesotrione applied to established turfgrass, phytotoxicity peaked at the following (one or two applications): Tifway bermudagrass Tifsport bermudagrass Common/ Tifblair centipedegrass Raleigh St. Augustinegrass 0.25 lb ai/a 0.5 lb ai/a 10 15% 10 15% Emerald zoysiagrass 45 50% El Toro zoysiagrass 20 25% Confederate Tall Fescue 50 60% 15 25% <5% <5% 5 15% 20 30% 0% 0%
17 Turfgrass Tolerance to Highly tolerant Common centipedegrass Tifblair centipedegrass Mesotrione Intermediately tolerant Raleigh St. Augustinegrass Tifsport bermudagrass Susceptible Common bermudagrass Emerald zoysiagrass Tall fescue Tifway bermudagrass Bentgrass cultivars El Toro zoysiagrass
18 Mesotrione 0.25 lb ai applied June 6 (5-7 lf crabgrass), photo taken June 14
19 Escalade 2 Bermuda, Zoysia, Bahia, KY Bluegrass, Ryegrass, Fescue, Bent (not greens). Also St. Augustine on Sod Farms (except Floratam). 2,4-D: 3.2 lbs/gal, Fluroxypyr: 0.4 lbs/gal, Dicamba: 0.4 lbs/gal
20 % Control Purple Deadnettle, Common Chickweed and Carolina Geranium Control LSD (p =.05) LAMPU STEME GERCA Tri-Power 3 pt/a Triplet SF 3.5 pt/a Escalade II 3 pt/a Check 2006: Sampson County (Applied Feb 24; Evaluated Mar 29)
21 Dismiss Turf Herbicide 4L (sufentrazone)
22 Dismiss (sulfentrazone) Rates for single applications Creeping bent, fine fescue, tall fescue, perennial ryegrass lbs ai/a Ky blue, bahiagrass, carpetgrass, centipedegrass, kikuyugrass, seashore paspalum, zoysiagrass, buffalograss Common and hybrid bermudagrass 0.25 lbs ai/a lbs ai/a
23 Echelon (prodiamine + sulfentrazone) Will be available this spring 0.3G and liquid form. Available 0.2 prodiamine sulfentrazone Warm and cool-season applications
24 % Control Preemergent Smooth Crabgrass Control Early September lb ai 0.25 lb ai lb ai Dismiss 4F Echelon L Echelon G Barricade 65WG lb ai sulfentrazone per acre LSD = 13.8 Dismiss and Echelon rates are lb ai sulfentrazone per acre. PRE treatments were applied Evaluated rates of Echelon provided 0.38, 0.5 and 0.75 lb ai prodiamine. Comparison Barricade rates mimicked prodiamine contained in Echelon
25 Yellow Nutsedge (Cyperus esculentus)
26 % Control Yellow Nutsedge (Cyperus esculentus) Control c 84 bc 93 abc 97 a 82 c sulfent d sulfent sulfent WAIT 5 e sulfent fb sulfent fb 0.25 Manage 1.3 oz Manage 0.25 fb Rates are per acre. Sequential applications applied 7 weeks after initial treatment. Falling Creek Country Club
27 Purple Nutsedge (Cyperus rotundus)
28 % Control Purple Nutsedge (Cyperus rotundus) Control g 9 efg 7 efg 0 g 42 bc 13 WAIT 17 de 80 sulfent sulfent sulfent sulfent fb sulfent fb 0.25 Manage 1.3 oz Manage 0.25 fb Rates are per acre. Sequential applications applied 7 weeks after initial treatment. Brandywine Bay Country Club a
29 % Control Purple Nutsedge Control With Dismiss and Quicksilver Combinations cd a-d cd bcd ab a May 30 Application; Sep 14 Evaluation 2006: Plymouth Country Club Dismiss 4F 8 oz/a Dismiss 4F 12 oz/a Quicksilver 1.9EW 2 oz/a Dismiss 4F + Quicksilver 1.9EW oz/a Certainty 1.25 oz/a + NIS 0.25% Monument 0.56 oz/a + NIS 0.25% Check
30 Green Kyllinga (Kyllinga brevifolia) & False Green Kyllinga (K. gracillima)
31 % Control False Green Kyllinga Control with Sulfentrazone lb ai.375 lb ai fb.25 lb ai Dismiss 4F sulfentrazone 0.3G.375 fb.375 lb ai LSD=11.0 Data collected , 82 DAIT. Rates are lb ai per acre. Sequential applied 6 WAIT.
32 Turf Quality (1-9) Centipedegrass and St Augustinegrass Tolerance to Sulfentrazone Sulfentrazone Sulfentrazone Sulfentrazone Sulfentrazone Nontreated 1 Centipedegrass LSD= 0.3 St Augustinegrass LSD= NS Data collected , 4 WAT. Rates are lb ai per acre of 80 WP formulation.
33 % Control False Green Kyllinga Control with Sulfonylureas application applications 0 Monument Sedgehammer Certainty LSD=11.0 Data collected , 82 DAIT. Rates are lb ai per acre. Sequential applied 6 WAIT.
34 Doveweed (Murdannia nudiflora) McCarty, Murphy, and Yelverton
35 % Control Doveweed Control abc 22d ef 13e f 7f 2f 55c d 30ef 3 WAT 6 WAT 8fg 15fg 12fg Revolver 0.4 oz TranXit 1 oz Monument 0.3 oz Monument 0.56 oz flazasulfuron 3 oz Rates are per acre applied August 31, Means within a year followed by same letter(s) are not significantly different (P=0.05). Porters Neck GC 2004.
36 % Control Doveweed Control ab 83ab 70abc Manor 0.5 oz ef 5f 37cde 25ef 15f g 20e fg Certainty 2 oz Image 0.5 lb ai Trimec Classic 3.5 pt Millenium Ultra 2.25 pt 0 0f 3 WAT 6 WAT Rates are per acre applied August 31, Means within a year followed by same letter(s) are not significantly different (P=0.05). Porters Neck GC 2004.
37 % Control Doveweed Control a 92a Speedzone 3 pt c d 55bc 63b cd 62b cd 67bc Speedzone Southern 3 pt Weedar 64 1 pt Weedar 64 2 pt Bueno 6 2 lb ai 20 17e f 10f 13f g 0 3 WAT 6 WAT Rates are per acre applied August 31, Means within a year followed by same letter(s) are not significantly different (P=0.05). Porters Neck GC 2004.
38 % Control Doveweed Control bc 40de Aatrex 1 lb ai Aatrex 2 lb ai Aatrex 1 lb ai + COC Aatrex 1 lb + Speedzone Southern 3 pt Aatrex 1 lb + Trimec Classic 3.5 pt ef 0f 0f 0f 0g 3 WAT 6 WAT 0g 0g 0g Rates are per acre applied August 31, Means within a year followed by same letter(s) are not significantly different (P=0.05). Porters Neck GC 2004.
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