殺虫剤の土壌施用に関する研究 : 第8報エチルチオメトン剤の土壌施用およびトップドレッシングがダイズ圃場の生物相, とくに害虫および捕食虫密度に及ぼす影響

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The effect of 5% Di-syston granules upon animal community was compared between the soil application and the top-dressing method in a soy-bean field. The insecticide was applied at the rate of 4 kg per 10 a at about 40 days after sowing, and fluctuations in the arthropod population was examined for 9 weeks after the application. Throughout the period of investigation, both methods resulted in the effective control of aphids. In the suppreive effect on total pest population, especially on the sucking-type, top-dressing appeared superior than soil application for 3 to 5 weeks after application. Direct lethal effect of the insecticide upon some species of predators and on the total of carnivores was recognized just after the application for 3 to 7 days in the case of soil application and about 1 to 2 weeks in the case of top-dressing. Total foliar arthropod population in the top-dressing was at first lower than that in the soil application, but about 4 weeks later it became higher than or similar to that in the latter plot. Total arthropod population on the ground above a few cm in depth was always lower in the soil application than in the top-dressing. During the first 4 weeks of the investigation, the ratio of total carnivores to total arthropods was lower, and the ratio of total soy-bean pests to total arthropods or to total carnivores was higher in the soil application than in the top-dressing. From these facts, it seemed that not only in the direct effect of pest control but also in the total ecological influence, top-dressing is more promising for pest control than soil application, at least during the first 4 weeks after the insecticide is applied. It was observed that there was a clear tendency for some of the predators, phytophagous spider mites, and other foliar arthropods to be more intensively affected by top-dressing than by soil application, and this might be the results of differences in the fumigative and systemic action between the two methods of insecticidal applications.
日本応用動物昆虫学会の論文
1970-12-25

殺虫剤の土壌施用に関する研究 : 第8報エチルチオメトン剤の土壌施用およびトップドレッシングがダイズ圃場の生物相, とくに害虫および捕食虫密度に及ぼす影響

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殺虫剤の土壌施用に関する研究 : 第8報 エチルチオメトン剤の土壌施用およびトップドレッシングがダイズ圃場の生物相, とくに害虫および捕食虫密度に及ぼす影響

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殺虫剤の土壌施用に関する研究 : 第8報エチルチオメトン剤の土壌施用およびトップドレッシングがダイズ圃場の生物相, とくに害虫および捕食虫密度に及ぼす影響