IMPACT OF FOLIAR OVERSPRAYS ON DUAL-GENE COTTONS COTTON INCORPORATED S 2012 - CROP M ANAGEMENT SEMINAR AND WORKSHOPS TUNICA, MS NOVEMBER 7-9, 2012 Dvid Kerns LA Gus Lorenz AR, Scott Stewrt TN, Angus Ctchot, Jeff Gore nd Don Cook MS, Ryn Jckson USDA-ARS, Stephen Biles TX, Roy Prker TX, Sebe Brown - LA
GENERAL BT TECHNOLOGY COMPARISON Pest Bollgrd (Cry1Ac) Bollgrd II (Cry1Ac + Cry2Ab) Widestrike (Cry1Ac + Cry1F) TwinLink (Cry1Ac + Cry2Ae) 1996 2003 2005 2013 Bollworm 4 2.5 3 2.5 Tobcco Bubworm 1 1 1 1 Pink Bollworm 1 1 1 1 Beet Armyworm 2 2 2 2 Fll Armyworm 2.5 2 1 2 Soyben Looper 1 1 1 1 1 = Complete control 2 = Rrely requires oversprys 3 = Sometimes requires oversprys 4 = Frequently requires oversprys
SPRAYING DUEL GENE COTTON FOR WORMS Current technologies re not bullet proof Under wht conditions Bt technology in question BGII vs WS Threshold/pressure Insecticide choice Efficcy/resistnce Other considertions Other pests Yield enhncement
MID-SOUTH THRESHOLDS Louisin Mississippi Tennessee Arknss Non-Bt 5 worms per 100 plnts plus eggs present (smll lrve) Before bloom nd cutout: 8 lrve/100 plnts, After bloom: 4 lrve per 100 plnts Before bloom nd cutout: 8 smll lrve/100 plnts or squre retention of < 80%, After bloom: 4 smll lrve per 100 plnts or 5% dmged squres 1 lrve (< 0.25 inch) per 2 row ft, or 1 per 4 row ft for lrger lrve, or 1 dmged squre per row ft plus eggs nd smll lrve, time to egg htch Bt Tret when 2-3% live lrve in fruit or when 10% plnt terminls infested (t lest 1/8 inch long lrve) Before bloom: 8 lrve/100 plnts or 5% dmged fruit, After bloom: 4 lrve per 100 plnts or 2% dmged bolls nd lrve re present (t lest 1/8 inch long lrve) Before bloom: 8 lrve/100 plnts or 5% dmged fruit, After bloom: 4 lrve per 100 plnts or 2% dmged bolls nd lrve re present 1 per 4 row ft lrve ( 0.25 inch)
Tretments Yield Increse Compred to UTC Conventionl Cotton, 2011 Coblt Adv 25 fl oz/ HGW86 6.75 oz/ 361.55 540.88 593.13 HGW86 13.5 oz/ HGW86 10.1 oz/ 672.30 663.05 704.53 701.93 743.40 Brigde 6.4 fl oz/ Belt 2 fl oz/ Belt 1.5 fl oz/+ Brigde 6.4 fl oz/ Beseige 9 fl oz/ 772.18 776.98 854.45 Belt 3 fl oz/ Beseige 12.5 fl oz/ 200 300 400 500 600 700 800 900 lbs/ Prevthon 20 oz/ Gus Lorenz
DUAL-GENE COTTON OVER SPRAYS HIGH BOLLWORM PRESSURE
Treted Yield - Untreted Yield lint lbs/cre High Pressure 2010 Yield Difference Comprison Treted (Corgen 0.088lb i/) vs. Untreted 700.00 600.00 598.86* DP 174 RF 500.00 PHY375 WRF 400.00 DP 0935 B2RF 300.00 313.03* DP 1050 B2RF 200.00 162.54 DP 1028 B2RF 100.00 112.13 100.39 80.92 59.59 DP 0912 B2RF DP 0949 B2RF 0.00 Treted (Corgen 0.088 lb i/) vs. Untreted -13.36 DP 1032 B2RF -100.00 Gus Lorenz
Lbs Lint per A MID-SOUTH BT OVERSPRAY YIELD 1200 1000 800 790 Non-Bt Bollgrd II Widestrike 1062 1015 928 933 909 897 915 711 827 600 603 400 370 200 0 Plnted Jeff Gore My 7
Returns Above Insect Control Off-Sttion Vlue-Added Trit Study Tchul Insecticide Applictions Triggered on Lrvl Thresholds Individully 2012 Untreted Krte Prevthon $1,400.00 $1,200.00 $1,000.00 $800.00 $600.00 3 2 1 1 1 1 $400.00 $200.00 $0.00 DP121 DP0912 PHY375 Ryn Jckson
Returns Above Insect Control Off-Sttion Vlue-Added Trit Study Twin Byou Insecticide Applictions Triggered on Lrvl Thresholds Individully 2012 Untreted Krte Prevthon $1,200.00 $1,000.00 $800.00 $600.00 1 1 1 1 $400.00 1 1 $200.00 $0.00 DP174 DP5458 PHY499 Ryn Jckson
DUAL-GENE COTTON OVER SPRAYS MODERATE BOLLWORM PRESSURE
TECHNOLOGY X FOLIAR INSECTICIDE TRIAL 1 (2012) 4500 4000 Seed Cotton Yield (moderte pressure) d b c c 3500 3000 2500 2000 1500 1000 0 3 4 4 0 1 1 3 0 2 2 3 U P B T U P B T U P B T NonBt (FM9250) BG2 (DP0912) WS (PHY375) U= Untreted P = Prevthon B = Belt T = Trcer Scott Stewrt
TECHNOLOGY X FOLIAR INSECTICIDE TRIAL 2 (2012) 4500 4000 Seed Cotton Yield (moderte pressure) 3500 3000 2500 2000 1500 1000 Prev Prevth fb Asn Brigde Untrt Prev Prevth fb Asn Brigde Untrt WS (PHY375) BG2 (DP0912) Scott Stewrt
DOES PREVATHON PROMOTE YIELD VIA SUPERIOR WORM CONTROL, OR THROUGH SOME OTHER FACTOR?
DUAL-GENE COTTON OVER SPRAYS LOW BOLLWORM PRESSURE
TECHNOLOGY X INSECTICIDE OVERSPRAY LOW BOLLWORM PRESSURE WINNSBORO, LA Yield (lbs-seed cotton/cre) 1600 1400 1200 1000 800 600 400 200 no significnt differences Untreted Prevthon 20 fl-oz Belt 3 fl-oz Trcer 2.9 fl-oz 0 DP 174F DP 1133 B2RF PHY 499 WF
TECHNOLOGY X FOLIAR INSECTICIDE TRIAL 3 (2012) 4000 3500 Seed Cotton Yield (light pressure nd overspryed leps) 3000 2500 2000 1500 1000 Prevthon Prevthon x 2 Brigde Untrt WS (PHY375) Scott Stewrt
Bt Cotton Overspry Test 4.545 bles/cre vg. 2012
Insecticide Overspry of PHY367 WRF oz/a Prevthon 14.0 Yield lb lint/cre 480 lb bles/ 4.63 Belt 3.0 4.60 Belt+Mustng 2.0+3.6 4.58 Besiege 8.0 4.68 Mustng Mx 3.6 4.57 Nontreted 4.21 0 300 600 900 1200 1500 1800 2100 2400 2700 Roy Prker - TX
Insecticide Overspry of DP 1044 B2RF oz/a Yield lb lint/cre Prevthon 14.0 Belt 3.0 Belt+Mustng 2.0+3.6 Besiege 8.0 Mustng Mx 3.6 Nontreted 0 200 400 600 800 1000 1200 1400 1600 Stephen Biles - TX
PERCEPTIONS OF INCREASED YIELD Sebe Brown LSU AgCenter
SUMMARY The benefit of oversprying duel-gene Bt cotton for bollworms is dependent on the technology in question nd the level of bollworm pressure Bollgrd II is more efficcious towrds bollworms thn Widestrike Vrietl differences lso occur Both Bollgrd II nd Widestrike cn benefit from insecticide oversprys trgeting bollworms when bollworm pressure in high Need reserch into djusting ction thresholds on duel gene cotton Should we be bsing worm sprys in Bt cotton on egg lys? Does Prevthon enhnce cotton yield in the bsence of bollworm pressure? The current body of dt suggests tht it does not; tht increses in yield pper to be due to insect control