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Cadre and Cotton: A Peanut Producer’s Dilemma

E. P. Prostko
A. S. Culpepper
T. L. Grey
C. W. Bednarz
W. D. Duffie

University of Georgia
Tifton, GA

• Slide Presentation (PowerPoint, 6.6 MB)

TABLE OF CONTENTS

Cadre and Cotton: A Peanut Producer’s Dilemma Cadre in Peanuts Cotton in Georgia: Planted Acres 1989-2001 Cadre Injury Symptoms What do we know about Cadre? Cadre Behavior in Environment Factors that Promote Microbial Degradation of Pesticides Other Soil Properties that Influence IMI Persistence Now you see it, now you don’t? Seed Cotton Yield Response to Cadre Residues in North Carolina How much Cadre does it take to cause injury? Cotton Yield Response to PPI Applications of Cadre Cotton Yield Response to PRE Applications of Cadre How much yield loss does Cadre carryover actually cause? Cadre Carryover in Cotton: Brooks County, GA&npsp;-  2000 Are there variety differences? Cotton Variety Response to Cadre at 8 PPB - 9 WAT Cotton Variety Response to Cadre at 16 PPB - 9 WAT Summary What can growers do? University of Georgia, Extension Weed Science

SLIDE CONTENTS

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 G-E control of many other species 18 Month Cotton Rotation Cotton in GeorgiaPlanted Acres 1989-2001 Source: GASS Cadre Injury Symptoms stunting shortened internodes yellowish-orange leaf color (lime) unpredictable What do we know about Cadre? Cadre Behavior in Environment 120 day half life upper 12-18” degradation * microbial * photolysis?? Source: WSSA Herbicide Handbook Factors that Promote Microbial Degradation of Pesticides adequate moisture warm soil temperatures (75-900F) favorable soil pH (> 5.5) good aeration 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 Now you see it, now you don’t? Seed Cotton Yield Response to Cadre Residues in North Carolina York et al., 2000 DES 119 How much Cadre does it take to cause injury? Cotton Yield Response to PPI Applications of Cadre Averaged over 2 varieties (DP33B, SG501BG/RR) Tifton, GA 2000 LSD 0.05 = 336 * * Cotton Yield Response to PRE Applications of Cadre Averaged over 2 varieties (ST4892RR/BG, ST4691BG) Plains, GA 2000 LSD 0.05 = 712 * * * How much yield loss does Cadre carryover actually cause? Cadre Carryover in CottonBrooks County, GA - 2000 674 lbs 770 lbs 770 lbs 1540 lbs 1348 lbs 1220 lbs 738 lbs/A (lint yield) 1369 lbs/A 6/09/00 Are there variety differences? Cotton Variety Response to Cadre at 8 PPB - 9 WAT Tifton, GA ef ef fg def fg fg def def fg fg g Cotton Variety Response to Cadre at 16 PPB - 9 WAT Tifton, GA a ab a abc ab ab a abc cde bcd a Summary cotton tolerant of 1/16-1/8X rates carryover caused 46% yield loss no significant variety differences * AP 6101 * GA 161 (Phytogen) 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 PPT Slide University of Georgia Extension Weed Science (gaweed.com)