Rice brown planthopper (BPH, Nilaparvata lugens) population collected from rice filed in Hangzhou was successively reared on susceptible rice TN1 in the laboratory without exposure to insecticides for more than 14 generations, and its susceptibility change to insecticides and ecological fitness on different resistant rice varieties were monitored by generations. The resistance to imidacloprid was sharply declined with increasing generations without exposure to insecticides from 359.94fold at F1 to 6.50fold at F14 compared with susceptible strain, and the resistance to chlorpyrifos was from 9.90fold at F1 to 5.94fold at F14. Nymphal duration, weight of newly hatched female adult was significantly affected by rice variety, generation and their interaction, meanwhile the nymphal survival was significantly affected by generations only. The ratio of brachypterous adults in male was affected by generations and generation × variety interaction, while no difference was found in female. Nymphal duration was prolonged with increasing generations, and female nymphal duration was shorter on susceptible variety TN1 than that on resistant varieties IR26 or IR36，meanwhile female adult weight on TN1 was higher than that on IR26 and IR36. These results indicated that resistance of field BPH population to insecticide was reversed after several generations without exposure to insecticide, and its ecological fitness on TN1 was better than that on IR26 and IR36. It implies an important role in BPH management by rational and reductive use of insecticides coordinating with manipulation of resistant rice cultivars.
DONG Biqin1,2, YANG Yajun2,*, XU Hongxing2, ZHENG Xusong2, K L HEONG3, LV Zhongxian2,*
. Susceptibility to Insecticides and Ecological Fitness on Resistant Rice Varieties of Population of Nilaparvata lugens Stl (Hemiptera: Delphacidae) without Exposure to Insecticide in Laboratory[J]. Chinese Journal OF Rice Science, 2013
, 27(4)
: 419
-424
.
DOI: 10.3969/j.issn.1001-7216.2013.04.012
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