3 years ago

Effects of seed mixture sowing with resistant and susceptible rice on population dynamics of target planthoppers and non-target stemborers and leaffolders

Gui-jun Wan, Zhuo Li, Fa-jun Chen, Zi-hua Zhao, Megha N. Parajulee, Long Wang
BACKGROUND The widespread planting of insect-resistant crops has caused a dramatic shift in agricultural landscapes, thus raising concerns about the potential impact on both target and non-target pests worldwide. In this study, we examined the potential effects of six seed-mixture ratios of insect-resistant dominance (100%-R100, 95%-S05R95, 90%-S10R90, 80%-S20R80, 60%-S40R60, and 0%-S100) on target and non-target pests in a 2-year field trial in southern China. RESULTS The occurrence of target pests, Nilaparvata lugens and Sogatella furcifera, decreased with the increased ratio of resistant rice, and the mixture ratios with ≥90% resistant rice significantly increased the pest suppression efficiency, with lowest occurrences of non-target pests, Sesamia inferens, Chilo suppressalis and Cnaphalocrocis medinalis, in S100 and S10R90 seed-mixture ratios. Furthermore, there were no significant differences in the 1000-grain dry weight and grain yield between R100 versus treatments with ≥80% resistant seed mixture (S20R80, S10R90 and S05R95). CONCLUSION S10R90 resulted in good yield and provided the most effective control of both target and non-target pests, with potential to significantly reduce the application of chemical pesticides for integrated pest management in paddy fields. It is further presumed that the strategy of seed mixture with resistant and susceptible rice would be advantageous for rice yield stability.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ps.4860

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