Nutsedge Control in Turfgrass practical approaches to consider. Kai Umeda Area Extension Agent
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1 Nutsedge Control in Turfgrass practical approaches to consider Kai Umeda Area Extension Agent
2 Nutsedge Control in Turfgrass Biological Cultural Chemical
3 Nutsedge Control in Turfgrass Biological Insects Diseases
4 Nutsedge Control in Turfgrass Cultural Solarization Mechanical Hand-pulling, hoeing Tillage Mowing
5 Nutsedge Control in Turfgrass Chemical Preemergence Fumigants Soil-applied herbicides Postemergence Foliar-applied applied herbicides
6 Nutsedge Control in Turfgrass Chemical Preemergence Fumigants Methyl bromide Metam-sodium Soil-applied herbicides Metolachlor (Pennant( Pennant*)
7 Nutsedge Control in Turfgrass Chemical Postemergence Triazine herbicides (simazine, atrazine) 2,4-D MSMA, DSMA Requires multiple applications Glyphosate (Roundup( Roundup*)
8
9 Advances in Chemical Control of Nutsedge in Turfgrass Discovery of ALS inhibiting herbicides in the 1980 s ALS enzyme in plants stopped Production of 3 amino acids reduced valine, leucine, isoleucine Imidazolinone and sulfonylurea herbicides
10 Advances in Chemical Control of Nutsedge in Turfgrass Imidazolinone and sulfonylurea herbicides Imazaquin (Image( Image*) Halosulfuron (SedgeHammer( SedgeHammer* * [Manage[ Manage*]) Trifloxysulfuron (Monument( Monument*) Sulfosulfuron (Certainty( Certainty*) Flazasulfuron (proposed Katana*)
11 Advances in Chemical Control of Nutsedge in Turfgrass Imidazolinone chemistry Image* * herbicide Uptake into plants through roots and shoots Translocated to the growing points Effective when combined with MSMA
12 Advances in Chemical Control of Nutsedge in Turfgrass Imidazolinone chemistry Image* * herbicide Immediately stops plant growth Causes yellowing or chlorosis in days Burns with MSMA Complete death of nutsedge in 2 weeks
13 Advances in Chemical Control of Nutsedge in Turfgrass Imidazolinone chemistry Image* * herbicide Effective rate at 0.5 lb AI/A 0.26 oz product (70DG)/1000 ft oz product (70DG)/A Add adjuvant (non-ionic surfactant) Combine with MSMA 2 to 3 lb AI/A
14 Advances in Chemical Control of Nutsedge in Turfgrass Sulfonylurea chemistry SedgeHammer*, Monument*, Certainty* * herbicides Uptake into plants through roots and shoots Translocated to the growing points
15 Advances in Chemical Control of Nutsedge in Turfgrass Sulfonylurea chemistry SedgeHammer* * herbicide Effective rate at lb AI/A 1.3 oz product (75WG)/A 0.03 oz product (75WG)/1000ft 2 Add non-ionic surfactant at 0.25 to 0.5% (v/v)
16 Advances in Chemical Control of Nutsedge in Turfgrass Sulfonylurea chemistry Monument* * herbicide Effective rate at lb AI/A 0.56 oz product (75DG)/A oz product (75DG)/1000ft 2 Add adjuvant non-ionic surfactant at 0.25 to 0.5% (v/v) Methylated seed oil (MSO) Crop oil concentrate (COC)
17 Advances in Chemical Control of Nutsedge in Turfgrass Sulfonylurea chemistry Certainty* * herbicide Effective rate at 0.06 lb AI/A 0.75 to 1.25 oz product (75 WDG)/A 0.8 gm product (75 WDG)/1000ft 2 Add adjuvant non-ionic surfactant at 0.25 to 0.5% (v/v) Add MSMA
18 Advances in Chemical Control of Nutsedge in Turfgrass Imidazolinone and sulfonylurea chemistries Repeat applications needed in severe infestations during a growing season More than 1 year to significantly reduce populations Turfgrass may be injured Seedhead suppression
19 Advances in Chemical Control of Nutsedge in Turfgrass Multiple applications needed in a year Image* Limit not stated SedgeHammer* 6 to 10 week interval Limited to 4 applications not exceeding 5.3 oz/a Monument* 6 week interval Limited to 1.7 oz/a Certainty* 4 to 10 week interval
20 Field Trial Results 2004 and to 4 applications made in 2004 followed by 2 more applications in 2005 Halosulfuron Halosulfuron Monument Monument Image Certainty % 88% 97% 95% 91% 95%
21 Field Trial Results 2005 Applications initiated in May, June, and July Overseeded ryegrass infested with nutsedge in May Transition occurred during June Bermudagrass only in July
22 Field Trial Results 2005 SedgeHammer* * and MSMA relatively safe on ryegrass with reduction of nutsedge Image* and Certainty* not safe on ryegrass and effective against nutsedge 4 applications starting in May or June vs 3 applications starting in July Monument*, Certainty*, Image*, SedgeHammer*
23 Field Trial Results 2005 MSMA at 3.0 lb AI/A multiple applications reduced nutsedge Relatively safe on overseeded ryegrass MSMA tank-mixed with Image* MSMA applied first followed by Certainty Tank-mixed with Certainty No advantage
24 MSMA Efficacy Against Nutsedge Can begin applications earlier in spring with ryegrass still present Apply every weeks Weaken nutsedge before summer applications of other chemistries Initiate other chemistry applications in July and make treatments Shorter daylength
25 Comparison of Herbicides for Nutsedge Control Image* 70 DG imazaquin 0.5 lb AI/A 11.4 oz/a 0.26 oz/1000ft 2 No limit SedgeHammer* 75 WDG halosulfuron lb AI/A 1.3 oz/a 0.03 oz/1000ft 2 4 applications 5.3 oz/a total Monument* 75 WG trifloxysulfuron lb AI/A 0.56 oz/a oz/1000ft oz/a total Certainty* 75 WDG sulfosulfuron lb AI/A 1.25 oz/a oz/1000ft oz/a total/year
26 Comparison of the Safety of Herbicides for Nutsedge Control Warm-season turfgrass use Image* Manage* Monument* Certainty* bermudagrass St. Augustinegrass zoysiagrass creeping bentgrass Ky bluegrass perennial ryegrass fine/tall fescue bermudagrass kikuyugrass seashore paspalum St. Augustinegrass zoysiagrass bermudagrass zoysiagrass bermudagrass St. Augustinegrass zoysiagrass kikuyugrass centipedegrass creeping bentgrass
27 Comparison of the Safety of Herbicides for Nutsedge Control DO NOT USE on Sensitive Turfgrasses Image* SedgeHammer* Monument* Certainty* golf/bowling greens bentgrasses perennial ryegrass Poa trivialis tall fescue dichondra golf course greens golf course greens dichondra other unlabeled turfgrasses Newly seeded, sodded,, or sprigged turfgrasses golf course greens or w/in 4 ft of greens
28 Comparison of the Safety of Herbicides for Nutsedge Control Interval to Fall Overseeding Image* SedgeHammer* Monument* Certainty* 1-1/21/2 months after treatment 2 weeks after application 6 weeks after last application not determined
29 Field Experiment 1 application
30 Turfgrass Research, Extension, Education turf.arizona.edu
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