Alternately Rearing with Susceptible Variety Can Delay the Virulence Development of Insect Pests to Resistant Varieties

Gu Gong, Yu-Dan Zhang, Zhen-Fei Zhang and Wei-Jian Wu
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Gu Gong: Laboratory of Insect Ecology, South China Agricultural University, Guangzhou 510642, China
Yu-Dan Zhang: Laboratory of Insect Ecology, South China Agricultural University, Guangzhou 510642, China
Zhen-Fei Zhang: Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Lant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Wei-Jian Wu: Laboratory of Insect Ecology, South China Agricultural University, Guangzhou 510642, China

Agriculture, 2022, vol. 12, issue 7, 1-12

Abstract: 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 (Stål) (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.

Keywords: alternately rearing; high-dose/refuge strategy; resistant crop varieties; biotype; virulence (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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