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Cadre and Cotton “A Peanut Producer’s Dilemma”

Cadre and Cotton “A Peanut Producer’s Dilemma”. E. P. Prostko, A. S. Culpepper, T. L. Grey, C. W. Bednarz, and W. D. Duffie University of Georgia Tifton. Cadre in Peanuts. discovered (1981) field tested (1989) EUP’s (1993-95) labeled (1996) excellent control of nutsedge complex

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Cadre and Cotton “A Peanut Producer’s Dilemma”

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  1. Cadre and Cotton“A Peanut Producer’s Dilemma” E. P. Prostko, A. S. Culpepper, T. L. Grey, C. W. Bednarz, and W. D. Duffie University of Georgia Tifton

  2. Cadre in Peanuts • discovered (1981) • field tested (1989) • EUP’s (1993-95) • labeled (1996) • excellent control of nutsedge complex • G-E control of many other species 18 Month Cotton Rotation

  3. Cotton in GeorgiaPlanted Acres 1989-2001 Source: GASS

  4. Cadre Injury Symptoms • stunting • shortened internodes • yellowish-orange leaf color (lime) • unpredictable

  5. What do we know about Cadre?

  6. CadreBehavior in Environment • 120 day half life • upper 12-18” • degradation * microbial * photolysis?? Source: WSSA Herbicide Handbook

  7. Factors that Promote Microbial Degradation of Pesticides • adequate moisture • warm soil temperatures (75-900F) • favorable soil pH (> 5.5) • good aeration

  8. Other Soil Properties that Influence IMI Persistence • higher OM soils • heavier soils (i.e. more clay) • low pH ( < 5.5) • Why? * Increased adsorption which reduces herbicide availability for microbial degradation

  9. Now you see it, now you don’t?

  10. Seed Cotton Yield Response to Cadre Residues in North Carolina DES 119 York et al., 2000

  11. How much Cadre does it take to cause injury?

  12. Cotton Yield Response to PPI Applications of Cadre * * Averaged over 2 varieties (DP33B, SG501BG/RR) LSD 0.05 = 336 Tifton, GA 2000

  13. Cotton Yield Response to PRE Applications of Cadre * * * Averaged over 2 varieties (ST4892RR/BG, ST4691BG) LSD 0.05 = 712 Plains, GA 2000

  14. How much yield loss does Cadre carryover actually cause?

  15. Cadre Carryover in CottonBrooks County, GA - 2000 674 lbs 770 lbs 770 lbs 738 lbs/A (lint yield) 1540 lbs 1348 lbs 1220 lbs 1369 lbs/A 6/09/00

  16. Are there variety differences?

  17. Cotton Variety Response to Cadre at 8 PPB - 9 WAT ef g fg fg def def fg fg def fg ef Tifton, GA

  18. Cotton Variety Response to Cadre at 16 PPB - 9 WAT a bcd cde abc a ab ab abc a ab a Tifton, GA

  19. Summary • cotton tolerant of 1/16-1/8X rates • carryover caused 46% yield loss • no significant variety differences * AP 6101 * GA 161 (Phytogen)

  20. What can growers do? • follow 18 month restriction • reduced rates of Cadre? • banded applications • Cadre on irrigated fields only? • foliar fertilization? • optimum pH and nutrient levels • plant suspect fields last

  21. University of Georgia Extension Weed Science (gaweed.com)

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