Dimethoate土壌施用によるキボシカミキリ成虫に対する殺虫効果とカイコへの影響

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Oral toxicity of Dimethoate to adults of the yellow-spotted longicorn beetle reached the value of LD_<50> 0.88μg/g and was two hundred and fifty times higher than that to the larvae (LD_<50> 220μg/g). Insecticidal effect of Dimethoate granules applied in soil ploughed to mulberry trees on the adult beetles persisted for 7 days at 6 g the application rate of per tree equivalent to 6 kg/10 a), for 20 days at a rate of 12.5 g and 40 days at a rate of 25 g and 50 g.The residues of Dimethoate in mulberry leaves amounted to 2.0 ppm at the application rate of 6 g per tree, to 1.5 ppm at a rate of 12.5 g, to 6.0 ppm at a rate of 25 g and to 7.8 ppm at a rate of 50 g, respectively, after 10 days of soil application. After 30 days of the application, the residual level of Dimethoate was reduced to 1.5 ppm, 1.9 ppm, 3.1 ppm and 4.0 ppm, respectively. The mulberry leaves from the tree to which Dimethoate granules had been applied killed newly hatched larvae of the silkworm except for the leaves from the tree treated with 6 g of the chemical after 10 days of application. Second instar larvae showed slightly toxic symptoms with leaves treated with 25 g and 50 g per tree. The larvae over the 3rd instar showed identical toxic symptoms with the leaves treated with 50 g of the chemical, but the cocooning of 5th instar larvae was normal. The mulberry leaves to which 25 g and 50 g of the chemical had been applied after 30 days of the application were slightly toxic to 5th instar larvae which were however able to produce a cocoon normally.
日本応用動物昆虫学会の論文
1982-08-25

Dimethoate土壌施用によるキボシカミキリ成虫に対する殺虫効果とカイコへの影響

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