Effects of various host plants on development and protective enzyme activities of black cutworm, Agrotis ypsilon (Rottemberg)
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Key Words:Agrotis ypsilon; host plant; nutrient content; development; protective enzyme activity
Abstract:The main nutrient components of the Chinese cabbage Brassica campestris ssp. Pekinensis, soybean Glycine max Merrill and corn Zea mays L. were studied using biochemistry analysis. The effects of these host plants on development, oviposition and survival rate of black cutworm Agrotis ypsilon (Rottemberg), as well as the protective enzyme activities in the 6th instars larvae were compared. Results showed that there were significant differences of the contents of soluble protein, soluble sugar and water in Chinese cabbage, soybean and corn. A. ypsilon individuals feeding on soybean had shorter larval and pupae duration than corn and Chinese cabbage, female have longer longevity and each laid more eggs which were 43.02 d, 11.87 d, 15.92 d, 936.67 eggs, respectively. But the egg hatching percentage was the lowest by feeding corn. The survival rate of larvae and pupae ranked as soybean >Chinese cabbage >corn. There was no significant difference in the activity of catalase (CAT), but the activity of superoxide dismutase (SOD) and peroxidase (POD) were different in the 6th instars larvae ranked as soybean >Chinese cabbage >corn.