Abstract:

Effects of the extracts from selected bamboos on the growth and the activities of the digestive enzyme and arbaxylesterase of Helicoverpa armigera larvae were reported in this paper. The results showed that the extracts from Pleioblastus juxianensis, Bambusa multiplex, Brachystachyum albostriatum show strong growth disrupting effects on tested pest. The activities of the digestive enzyme in the larvae of Helicoverpa armigera fed with extract of Pleioblastus juxianensis, Bambusa multiplex, Brachystachyum albostriatum were higher than the control treatment, Thereinto, the activity of protease changed largest, that of amylase larger, and the activity of lipase changed a little. The activity of arbaxylesterase in the larvae fed with extract of Pleioblastus juxianensis, Bambusa multiplex, Brachystachyum albostriatum was inhibited, the relative enzyme activities after 3 days of which were 0.626、0.637、0.602 folds compared to CK, respectively. The effect on the enzymes in Helicoverpa armigera larvae was reduced with the treatment time.

Key words: bamboo extracts, Helicoverpa armigera, digestive enzyme, arbaxylesterase