Screening Test of Insecticides to Control Rice Planthoppers in Single Late Rice
HUANG Fudan;LI Bin;CHEN Youjia;WANG Guorong;Xiaoshan District Agricultural Technology Promotion Center;
The effects of six insecticides to control rice planthoppers were measured in field of single late rice. The results showed that dinotefuran 20% WP(30 g/667 m2), pymetrozine-nitenpyram 60% WG(12 g/667 m2) and pymetrozine-nitenpyram 80% WG(10 g/667 m2)effectively decreased the population of rice planthoppers, especially in the low instar nymphs. The effects of pymetrozinenitenpyram 60% WG and pymetrozine-nitenpyram 80% WG were better in high instar nymphs. Meanwhile, these two insecticides had high-speed effect and safety to natural enemies of pests. In addition, the effect of nitenpyram 50% WP was poor-speed but long du-ration. However, the effect of imidacloprid 10% WP(50 g/667 m2) on planthoppers was low, even had no effect on high instar nymphs. Furthermore, the chlorpyrifos 40% EW(100 m L/667 m2)and sulfoxaflor 22% SC(14 m L/667 m2)had slow action and short duration, and were harmful to nature enemies. Taken together, one powerful approach for rice planthoppers control was declared in the paper. The approach is the alterative use of pymetrozine 50% WP, dinotefuran 20% WP and pymetrozine-nitenpyram 60% WG during the low instar stages and the peak of incubation period.
【CateGory Index】： S435.112.3