Effect of Novel Insecticide HNPC-A9908 on Growth of Green Algae Chlorella pyrenoidosa

HNPC-A9908 is a novel insecticide which is effective in controlling various pest insects on vegetable, rice and other crops. Toxicity of HNPC-A9908 to the green algae Chlorella pyrenoidosa was studied in the laboratory through 96~120 h acute toxicity tests using the algae test flasks. The experimental results showed that HNPC-A9908 had some inhibition to the growth of the algae, and its 96 h-EC50 value in acetone and in ethyl acetate is 3.14 mg/L and 25.2 mg/L, respectively, indicating that HNPC-A9908 was considered as a low toxic pesticide to the green algae. In addition, HNPC-A9908 also exhibited some inhibitory effects on the photosynthesis pigments such as chlorophyll a and chlorophyll b, the greatest inhibition was observed in chlorophyll a of the algae.