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Toxicity of dieldrin-concrete mixtures to termites



Toxicity of dieldrin-concrete mixtures to termites



Jour Econ Entomol 57(1): 26-29



Exposure of Reticulitermes flavipes (Kollar) on the surface of 0.1% and 1.6% (w/w) dieldrin-concrete mixtures resulted in knockdown and death. Laboratory aging of mixtures caused an initial reduction in surface toxicity leaving a stable residual toxicity. After 16 months the residual toxicity caused knockdown. Newly cracked surfaces of laboratory-aged mixtures were equivalent in toxicity to the original surface of new mixtures. After 22 months dieldrin-concrete posts set in clay loam soil at Madison, Wisconsin, have shown no reduction in surface toxicity to R. flavipes. Dieldrin concentration in the soil, 1 1/2 years after a 1.6% dieldrin-concrete post had been put in the ground, was 2.49 ppm at 2 in. and 0.49 ppm at 6 in. from the post. Ten species of termites exposed to 0.1% and 1.6% dieldrin-concrete blocks were affected. The dieldrin concentration in the 0.1% blocks was 542 [plus or minus] 7 ppm. The results of exposures indicated that 4 subterranean species were more sensitive to dieldrin-concrete poisoning than were 5 nonsubterranean species (not including 1 species in which only debilitated insects were available).

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Accession: 014784583

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DOI: 10.1093/jee/57.1.26


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