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Residues of Malathion and Metabolites in and on the Cotton Leaf vs. Toxicity to the Boll Weevil

D.A. Wolfenbarger, J.E. Mulrooney and R.G. Jones


ABSTRACT

Malathion was applied at 12 and 16 oz [A.I.]/a to cotton near Mercedes, TX, in 1995 and sampled on 0, 2, 4 and 6 d posttreatment to determine residues of malathion, malaoxon, and iso-malathion. Residues were then compared to determine toxicity to boll weevil, Anthonomus grandis Boheman. Residues of malathion comprised 99% of the leaf washes and 100% of the leaf homogenates. Malaoxon was found in one leaf wash sample of a leaf collected on 0 d from cotton sprayed with the low use rate. Iso-malathion was not found in any sample. Residues of 2.43 to 13.63 ppm malathion killed 100% of the weevils on d 0 and 2. Residues of 1.55 to 1.99 ppm killed 89% to 90% of the boll weevils on d 4 and 0.5 to 1.26 ppm killed 72% to 81% of the boll weevils on d 6.





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Document last modified May 20, 2002