Surveillance and Chemical Control of the Brown Planthopper

Saburo Fukamachi

《中華昆蟲》 4卷2期 (1984/09) Pp. ap16+139-147

https://doi.org/10.6660/TESFE.1984023

摘要

Early season rice plants (mid-April - early August) are cultivated on 8,000 ha and normal season ones (early June-October) on 30,000 ha in Kagoshima Prefecture located at the south-western tip of Japan. General forecasting work for rice and vegetables is carried out by two researchers at the experiment station and 10 technical officers at three plant protection offices. Light taps, rborne net traps and sticky traps are used for catching brown planthopper immigrants from overseas during the rainy season (June-July). Besides, there are nine surveying points equipped with a light trap over the prefecture. Monitoring observations at 100 fixed points are carried out twice a month during the cropping season. After the establishment of immigrants in rice fields, the temperature-sum rule is applied to predict the appearance of insect stages in the subsequent generations, and thus the timing of insecticide applications is determined in advance. The incidence of grassy stunt disease can be perdicted when immigrants come from the more southern part of China mainland, south to 25°N lat. In the standard control measures, insecticides are usually applied twice at 10-day intervals during late August to early September for the suppression of hopperburn. Additional applications of insecticides are practised in the form of simultaneous control when the outbreak of the leafroller occurs or the long-lasting heat prevails in late summer. Owing to planthopper resistance to insecticides, carbamate and phosphorus insecticides have been replaced by the mixtures of these insecticides.