ABSTRACT: The persistence of seleceted termiticides under field conditions was ascertained by treating soils at recommended rates and analyzing residues for six years. The termiticide residues at zero interval were: deltamethrin EC at 94, 83 and 73 ppm; deltamethrin SC at 136, 96 and 75 ppm;and chlorpyrifos TC at 589, 445, and 410 ppm in alkaline, acidic and neutral soils, respectively. After one year, the residues remained at 54, 31 and 35 ppm for deltamethrin EC; 27, 39 and 35 ppm for deltamethrin SC; and 73, 60 and 65 ppm for chlorpyrifos in alkaline, acidic and neutral soils, respectively.
After 6 years, we detected deltamethrin EC at 15, 23 and 10 ppm; deltamethrin SC at 11, 14, 11 ppm and chlorpyrifos TC at 3,3,and 3 ppm in alkaline, acidic and neutral soils,
repectively. These termiticide residues were adequate to control subterranean termites.
Species 1: Isoptera Rhinotermitidae Reticulitermes flavipes (Subterranean Termite)
Keywords: degradation, termiticides
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