• 作者： 程建中; 陳秋男
• 作者服務機構： 臺灣植物保護中心
• 中文摘要： 褐飛蝨在一天中之取食活動呈規律性改變。由一天中不同時段收集的蜜露量得知，其取食最盛時間約在上午5～9時。應用乾膜法測得其對殺蟲劑加保扶之LC50 值亦以5～9時最低。兩組曲線之變化恰好相反，而兩者之關係呈顯著負相（r=-0.8925）。由此推論，褐飛蝨之取食活動有日節律現象，因而系統性殺蟲劑對其毒效亦相應地作規律性改變。
• 英文摘要： Circadian rhythm of LC50 values to Carbo-furan (=Furadan) was detected by timing re-sidual treatments for the brown planthopper,reared under 14 hrs photophase beginning withdawn at 5:00 a. m., temperature fluctuating from28℃-31℃ and r. h. 66-95%. The LC50 valuesof 6 treatments arranged at 4-hr. intervals, viz.0100-0500, 0500-0900, 0900-1300, 1300-1700,1700-2100 and 2100-0100 (next day), were 11.4,9.9, 11.9, 16.3, 16.2 and 15.0 ppm, respectively.And a significant negative correlation (r=-0.8925, p<0.05) existed between LC50 valuesand relative amount of honeydew excretion,which was an indication of its feeding activity.Thus, the lowest LC50 value detected during0500-0900 coincided with the most active feed-ing period of the planthopper in a day. Weconclude that the rhythmic change of LC50values to carbofuran for the planthopper de-tected by the residual film method could beattributed to the circadian feeding activity ofthe insect.
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