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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タイトル別名
  • Insecticidal Effect of Dimethoate Applied in Soil on Adults of the Yellow-Spotted Longicorn Beetle, <i>Psacothea hilaris</i> PASCOE (Coleoptera: Cerambycidae) and the Silkworm, <i>Bombyx mori</i> L. (Lepidoptera: Bombycidae)
  • Dimethoate ドジョウ シヨウ ニヨル キボシカミキリ セイチュウ ニ

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説明

Oral toxicity of Dimethoate to adults of the yellow-spotted longicorn beetle reached the value of LD50 0.88μg/g and was two hundred and fifty times higher than that to the larvae (LD50 220μg/g). Insecticidal effect of Dimethoate granules applied in soil ploughed to mulberry trees on the adult beetles persisted for 7 days at 6g the application rate of per tree equivalent to 6kg/10a), for 20 days at a rate of 12.5g and 40 days at a rate of 25g and 50g. The residues of Dimethoate in mulberry leaves amounted to 2.0ppm at the application rate of 6g per tree, to 1.5ppm at a rate of 12.5g, to 6.0ppm at a rate of 25g and to 7.8ppm at a rate of 50g, respectively, after 10 days of soil application. After 30 days of the application, the residual level of Dimethoate was reduced to 1.5ppm, 1.9ppm, 3.1ppm and 4.0ppm, respectively.<br>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 6g of the chemical after 10 days of application. Second instar larvae showed slightly toxic symptoms with leaves treated with 25g and 50g per tree. The larvae over the 3rd instar showed identical toxic symptoms with the leaves treated with 50g of the chemical, but the cocooning of 5th instar larvae was normal. The mulberry leaves to which 25g and 50g 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.

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