期刊
AGRICULTURE-BASEL
卷 12, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/agriculture12070991
关键词
alternately rearing; high-dose/refuge strategy; resistant crop varieties; biotype; virulence
类别
资金
- National Key Research and Development Program of China [2021 YFD1401100]
- National Natural Science Foundation of China [32172507]
This study found that intermittent feeding on susceptible varieties can reduce the virulence of herbivorous insects on resistant varieties, which can delay the progress of resistance-breaking. Therefore, careful alternation between susceptible and resistant varieties is a potential method for managing pest resistance.
Resistant crop varieties can usually decrease the population density of insect pests; however, they can also easily cause the occurrence of highly virulent pest populations when repeatedly grown. Whether herbivorous insects feeding intermittently on a susceptible variety affects their subsequent virulence has rarely been investigated. In this paper, we examined the variations in the virulence of the brown planthopper (BPH), Nilaparvata lugens (Stal) (Hemiptera: Delphacidae), by alternately rearing three resistant rice varieties, Mudgo, ASD7, and Rathu Heenati, with a susceptible rice variety (TN1) in indoor experiments. The results showed that, while the susceptible rice variety was used in alternate rearing for several generations, the BPHs exhibited a higher intrinsic rate of increase (r(m)) and were identified as less virulent to all three resistant varieties. Such virulence reduction by experience with a susceptible variety could delay the progression of resistance-breaking toward resistant varieties. The results suggested that careful alternation with susceptible varieties in fields is a potential method for pest variety-resistance management.
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