Effects of Pymetrozine on the Feeding Behaviour of Rice Brown Planthopper, Nilaparvata lugens (Stal)
HE Yue-ping1; CHEN Li1, 2;CHEN Jian-ming1, *;CHEN Lie-zhong1;ZHANG Jue-feng1
1Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China; 2College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China; *Corresponding author, E-mail: firstname.lastname@example.org
Pymetrozine is one of the recommended alternatives for controlling rice brown planthopper, Nilaparvata lugens (Stl). Initial feeding choice experiments with winged female adults showed that after 24 h, there were no significant differences between the numbers of planthoppers alighting on untreated rice plants and those treated with 01 g/L pymetrozine (15±09 adults and 16±12 adults, respectively). Electrical penetration graph (EPG) data indicated that after the treatment of 01 g/L pymetrozine, no significant difference occurred on the frequency of stylet probing, the frequency of penetration into phloem, the duration in the extracellular region of phloem, and the duration of xylem ingestion, while the duration of nonprobing period increased, and the phloem ingestion behaviour was significantly interrupted compared with the treatment of water. The total duration of phloem ingestion of N. lugens adults in 4 h was only 12±05 min on the plants treated with pymetrozine, whereas 651±113 min on the untreated plants. Feeding recovery data suggested that the inhibition of pymetrozine on the phloem ingestion of N. lugens could be recovered, but took long time. The total duration of phloem ingestionof N. lugens was only about 10 min when the insects were first released to the rice seedlings treated by 01 g/L pymetrozine for 24 h, and then survived insects were transferred to the untreated rice seedlings for 120 h. It is revealed that pymetrozine had no deterrent or antifeeding effects on N. lugens, and did not block the stylet probing and the xylem ingestion of N. lugens. However, it significantly inhibited the phloem ingestion of N. lugens, and the recovery of N. lugens from the inhibitive effects was slow. Thus, pymetrozine has a high and persistent efficacy against N. lugens.
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