Determination of Toxicity to Aphis Gossypii by Organic Pesticide and Test of Pesticide Effects in Field

【Objective】To ascertain the control effects of 0.6% Ginkgolides WE and 1.5% Pyrethrins WE on Aphis gossypii in organic cotton fields.【Method】Toxicity of Ginkgolides and Pyrethrins on Aphis gossypii were tested in laboratory,and tested its effect on Aphis gossypii were tested in fields.【Result】The laboratory experimental results indicated that the LC50 of Ginkgolides and Pyrethrins after 24 h treatment were 430.064 1 mg/L and 473.139 5 mg/L,the LD50 of Ginkgolides and Pyrethrins after 24 h treatment were 0.000 1 and 0.000 3 μg/g.【Conclusion】The field trial results showed that Pyrethrins had sustainable control effect on Aphis Gossypii.After 7 days treatment,the control efficacy was 80.13%.After 7 days treatment,the Ginkgolides efficacy was depressed by 43.72%.Ginkgolides and Pyrethrins could control Aphis gossypii in organic cotton fields.