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Shading studies were conducted on snap bean,  Phaseolus vulgaris  L. cv. Hawaiian Wonder, plants to observe the influence of endogenous carbohydrate content of leaves on the feeding activity of the Chinese rose beetle (CRB)  Adoretus sinicus  Burmeister. Increasing the shade level from 0 to 40 or 80 % shade significantly decreased carbohydrate content of leaves and reduced CRB feeding. The normal distribution of carbohydrates within snap bean plants was altered by foiling the 2 terminal ranks of leaves and exposing the 2 subtending ranks to full sun. The feeding pattern of the CRB was observed to change in accordance to the carbohydrate concentration at each leaf rank. We speculate that carbohydrate concentration within leaves stimulates CRB feeding.

CARBOHYDRATE CONTENT OF SNAP BEAN LEAVES INFLUENCES CHINESE ROSE BEETLE FEEDING.