Journal of Taiwan Agricultural Research

Author:Po-Yu Lai and Shou-Horng Huang*

Abstract:

The objective of this study was to evaluate the effectiveness of twenty registered insecticides on 4^th–5^th instar nymph of brown planthopper [Nilaparvata lugens (Stål)] and whitebacked planthopper [Sogatella furcifera (Horváth)] collected from Chiayi region during 2016. The morality of both planthopper species was tested by tower spray and rice seedling dipping methods in laboratory conditions. The results from tower spray tests on brown and whitebacked planthopper indicated that carbosulfan (48.34% EW) and clothianidin (16% SG) were the most effective insecticides, causing the morality at 84.7% and 93.4% respectively, followed by dinotefuran (20% SG) and benfuracarb (20% EC), mortality between 69.0–80.3%. Acephate (5% SP). Carbosulfan (48.34% EW) exhibited the mortality (75.7–91.0%) significantly higher than others on brown planthopper. Although benfuracarb (20% EC), carbosulfan (48.34% EW) and pymetrozine (25% WP) are commonly recommended for controlling whitebacked planthopper, the mortalities were 84.7% using the rice seedling dipping method. Judging from all results among the twenty insecticides by two test methods, dinotefuran (20% SG), carbosulfan (48.34% EW) and benfuracarb (20% EC) were effective for controlling both brownand whitebacked planthoppers. To effectively control rice pests, occurrence of planthopper species in the field must be closely monitored. In addition to registered insecticides, efforts are needed to select more effective insecticides in order to achieve cost-effective management.

Key words:Nilaparvata lugens (Stål), Sogatella furcifera (Horváth), Insecticide, Tower spray method, Rice seedling dipping method.

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