关键词: 灰茶尺蠖')">灰茶尺蠖, 茶树; 茶树品种')">茶树; 茶树品种, 取食选择性')">取食选择性, 生化成分')">生化成分, 生长发育')">生长发育

Abstract: 【Aim】 This study aims to determine the feeding preference of Ectropis grisescens Warren to leaves of different tea (Canmellia sinensis) cultivars and the influence of leaves of different tea cultivars on the growth and development of this insect, so as to explore the adaptation mechanism of E. grisescens to tea cultivars. 【Methods】 The feeding preferences of E. grisescens larvae to leaves of 11 tea cultivars were measured, and five tea cultivars were screened based on the results of preference test. The contents of biochemical components (water, soluble sugar, tea polyphenols and free amino acids) in leaves of five tea cultivars were determined, and then the relationship between the feeding preference of E. grisescens and the contents of biochemical components in leaves of tea plants was analyzed. The effects of different tea cultivars on the growth and development of E. grisescens feeding with leaves of the five tea cultivars were measured. 【Results】 The feeding preference of E. grisescens larvae to leaves of 11 tea cultivars in descending order was Pingyangtezao>Shuchazao>Zhonghuang 2>Yuexiangzao>Zhonghuang 1>Lanlixiang>Caoxi 1>Yulu 1>Fudingdabai>Shancha 1>Suyuhuang. The linear regression analysis showed that the feeding preference of E. grisescens was positively correlated with the water content and soluble sugar content in tea leaves, and negatively correlated with the contents of tea polyphenols and free amino acids, suggesting that E. grisescens prefers the tea leaves with higher contents of water and soluble sugar, but not those with higher contents of tea polyphenols and free amino acids. After the larvae fed on leaves of different tea cultivars, their low instar larval, prepupal and pupal duration were significantly different, but their adult longevity, weight of the last instar larva, pupal weight, larval survival rate, adult emergence rate, number of eggs laid per female, leaf consumption and food utilization rate showed no significant difference. 【Conclusion】 The biochemical components of tea plants influence the feeding selection of E. grisescens, which can adapt to host plants by changing the feeding strategy.

Key words: Ectropis grisescens, Camellia sinensis, tea cultivar, feeding preference, biochemical component, growth and development