Butler, T. J.

Evers, Gerald Wayne

Melson, N. B.

Parsons, Margaret J.

English

Texas A&amp;M Repository

    PUBLICATIONS 2004 HERBICIDE EVALUATIONSON ESTABLISHMENT OF TIFTON 85 BERMUDAGRASSG. W. Evers, N. B. Melson, M. 1. Parsons, and T. J. ButlerBackground. Hybrid bennudagrass is used for hay and grazing; and is the mainimproved warm-season perennial grass in the eastern half of Texas and the southeastern UnitedStates. Because hybrid bennudagrasses produce very little seed, they are established vegetativelyby planting springs (rhizomes, roots, stolons, and stems). Tifton 85 is replacing Coastal as thenew bennudagrass standard because of its high yield and nutritive value. Warm-season annualweeds are a major problem in establishing clean bennudagrass stands quickly: At this timeWeedmaster (2,4-D amine + Dicamba) and the low volatile ester fonn ·of 2,4-D are the onlyherbicides labeled for establishing sprigged bennudagrass. An herbicide study was conducted in2002 on the Beverly and Ross Kinney farm 5 miles north of Overton. Herbicide treatments wereapplied 1, 14, and 29 days after planting (DAP) Tifton 85 bennudagrass on May 9. The area wasirrigated with a sprinkler gun to maintain good soil moisture during the study. Plots were 6 x 15 ftarranged in a randomized complete block design with four replications. Some herbicides onlywere applied for preemergence weed control (I DAP), some for pre- and postemergence weedcontrol (14 and 29 DAP), and some just for postemergence weed control. Plots were visuallyscored (0= no injury, 5=dead) by two people 6 weeks after preemergence treatments, 5 weeksafter 14 DAP treatments, and 3 weeks after 29 DAP treatments.Research Findings. All herbicide treatments exhibited some lDJUry on Tifton 85bennudagrass but none eliminated Tifton 85 (Table I). Preemergent (I DAP) treatments were lessphytotoxic than the postemergence treatments. Weedmaster and 2,4-D ester, which are labeled fornewly sprigged bennudagrass, caused some stunting but were not different from the controltreatment. The 2,4-D amine, Grazon P+D, Roundup, Redeem, Mandate at 2 and 3 pt/acre, and the3 pt/acre rate of Prowl injury ratings were not different from the control. Plateau was the mostphytotoxic herbicide. Damage increased as Plateau rate increased and was greatest when applied14 DAP. Of the 14 DAP postemergence treatments, 2,4-D amine, Weedmaster;Grazon P+D at Ipt/acre, and CGA362 at 0.2 oz/acre had injury scores of less than 2. Of the 29 DAP treatments,Weedmaster had the lowest injury rating and it was not different from the control. Othertreatments with low injury ratings were 2,4-D amine and ester, Grazon P+D, Redeem at I pt/acre,CGA362 at 0.3 oz/acre, and Fuego.Application. Weedmaster and 2,4-D ester are labeled for use on newly establishedbennudagrass anytime after sprigging. If applied prior to gennination of crabgrass these55herbicides will suppress crabgrass for approximately 30 days and will cause little injury tobennudagrass. Once the bennudagrass sprigs reach a 6-in length, bennudagrass is considered tobe established, and then the other herbicides labeled for pasture weed control can be used tocontrol broadleaf weeds.Table I. Injury ratings to Tifton 85 bermudagrass 6 weeks after 1 DAP treatments,S weeks after14 DAP treatments and 3 weeks after 29 DAP treatmentstInJury ratmg 0 = no mJUry' 5 = dead.tValues in a column followed by the same letter are not significantly different at the 0.05 level,Fisher's Protected LSD.,Applied days after planting1 I 14 29Herbicide Rate/acre ----------------------------Injury ratingt------------------------Control -- 0.0 g~ 0.0 g 0.0 kPlateau 10z 2.3 a-c 3.3 a-c 2.3 c-gPlateau 20z 3.3 a 4.0 ab 2.8 b-dPlateau 30z 4.5 a 3.5 ab2,4-D amine 4 pt 0.8 e-g 0.5 fJ?; 1.3 hi2.4-D ester 3 pt 0.8 e-g 2.3 c-e 1.7 f-iWeedmaster 3 pt 0.5 gf 1.8 d-f O.3jkGrazonP+D 1 pt 1.3 c-g 1.8 d-f 1.8 e-iGrazonP+D 2 pt 2.7 b-d 1.5 g-iRoundup 0.5 pt 3.3 a-c 3.8 aRoundup 2 pt 0.3 gCimmaron Max 0.25 oz Ally 2.3 a-c 2.3 c-e 2.3 c-f1 pt WeedmasterRedeem 1 pt 2.3 c-e 1.0 ijRedeem 2 pt 1.0 d-g 2.8 b-d 2.3 c-gMandate 2 pt 1.3 c-gMandate 3 pt 1.3 c-gMandate 4 pt 3.3 aProwl 3 pt 1.0 d-gProwl 4 pt 1.5 c-fCGA362 0.2oz 1.0 e-g 2.0 d-hCGA362 0.3 oz 3.0 b-d 1.5 g-iCGA362 0.4 oz 1.8 b-e 2.0 c-e 2.5 c-eCGA362 0.50z 2.8 abFuego 0.59 oz amber 2.0 b-d 2.3 c-e 1.3 hi12.5 oz clarityLAF004 2 pt 2.3 a-c 2.8 b-d 2.0 d-hEF1506 2 pt 2.0 c-e 3.0 a-c..56

Herbicide evaluations on establishment of Tifton 85 bermudagrass

Texas A&M University

https://oaktrust.library.tamu.edu/bitstream/1969.1/189755/1/article88.pdf

Herbicide evaluations on establishment of Tifton 85 bermudagrass

Abstract

Similar works

Full text

Available Versions

Texas A&M Repository

Texas A&M University

Herbicide evaluations on establishment of Tifton 85 bermudagrass

Abstract

Similar works

Full text

Available Versions

Texas A&amp;M Repository

Texas A&M University

Texas A&M Repository