关键词: 银杏, 外种皮, 水提液, 菜青虫, 毒力

Abstract: Toxicity of extract from exopleura of Ginkgo biloba against Pieris rapae was evaluated in the study. The results showed that the mortality of extract at the concentration of 0.75g/ml against 3-instar larvae of P. rapae was 76.6% and extract of 0.15g/ml was 53.3%. Fed on the cabbage leaves treated with extracts (0.75g/ml, 0.15g/ml), the death rate of 3-instar larvae was 63.3% and 43.3%, respectively. The toxicity of extract (0.75g/ml) against 5-instar larvae of P. rapae was lower (33.3%) than that against 3-instar larvae. After 5d, the corrected mortality of extract at the concentration of 0.75g/ml was 63.6% in the field trial.

Key words: Ginkgo biloba, exopleura, water extract, Pieris rapae, toxicity