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5189846 
Journal Article 
Dislodgable Insecticide Residues on Cotton Foliage: Permethrin, Curacron, Fenvalarate, Sulprofos, Decis, and Endosulfan 
Estesen, BJ; Buck, NA; Ware, GW 
1979 
Yes 
Bulletin of Environmental Contamination and Toxicology
ISSN: 0007-4861
EISSN: 1432-0800 
22 
The disappearance rates of permethrin (52645531), Curacron (41198087), fenvalerate (51630581), Sulprofos (35400432), FMC-45498 (52918635) (Decis), and endosulfan (115297) from cotton were investigated as part of the "Worker Safety Reentry Intervals for Pesticide Treated Crops" Regional Project at the University of Arizona. Test cotton plots located on a 16 acre block at an agricultural experiment station in Arizona were sprayed with the pesticides at rates of 0.023 to 1.1 kilograms per hectare. Triplicate samples were collected in each treatment plot at 0 to 96 hours and analyzed for dislodgeable insecticide residues. Each sample consisted of 100 leaves punched singly and collected from the top, middle, and bottom portions of plants using 2.54 centimeter diameter leaf punches. Two significant rains occurred during the sampling period, at 24 to 48 and 72 to 96 hours. The concentrations of dislodgeable residues for each insecticide at each sampling time were tabulated. The concentrations of endosulfan, Curacron, and Sulprofos residues decreased most during the first 24 hours. Only Sulprofos residues seemed to be significantly affected by the two rains. The concentration of the synthetic pyrethroid residues (fenvalerate, permethrin, and Decis) appeared to decrease very slowly. Fenvalerate was 65 percent, permethrin 47 percent, and Decis 32 percent of their original residues after 96 hours. The authors conclude that part of the reported efficacy of the synthetic pyrethroids can be attributed to their resistance to photolysis and removal by rain.