Abstract:

【Objective】Evaluate the indoor toxicity and field control efficacy of 4 plant derived pesticides on Uroleucon gobonis to screen for pesticides with better control effect.【Methods】Using 50% pymetrozine WG as control agent，the indoor toxicity of 4 plant derived pesticides，0.6% matrine AS，1.5% pyrethroid EW，6.0% rotenone ME，and Pinellia ternata ethanol extract to Uroleucon gobonis was determined by leaf impregnation method. The field control efficacy was determined by leaf spray.【Results】3 d after treatment，the LC₅₀ of 0.6% matrine AS，1.5% pyrethroid EW，6.0% rotenone ME，and Pinellia ternata ethanol extract were 0.016，6.653，9.173，and 30.931 mg/L，respectively. While the LC₅₀ of control agent 50% pymetrozine WG was 24.786 mg/L. The toxicity of 0.6% matrine AS，1.5% pyrethroid EW，and 6.0% rotenone ME were significantly higher （P<0.05） than the control. After 1 d and 7 d treatment，the field control efficacy of 0.6% matrine AS 400 times diluted solution was 76.81% and 96.39%，respectively，indicating rapid and sustained efficacy. The field control efficacy of 1.5% pyrethroid EW 150 times diluted solution and 6.0% rotenone ME 500 times diluted solution 7 d after treatment was 88.84% and 88.37%，similar to the 87.29% filed control efficacy of the control agent 50% pirimid WG 750 times diluted solution.【Conclusion】0.6% matrine AS could be used for the prevention and control of Uroleucon gobonis in the peak infection period，while 1.5% pyrethroid EW and 6.0% rotenone ME could be used in the subsequent period. All three plant derived pesticides could be promoted and applied in the prevention and control of Uroleucon gobonis.

Key words: Plant derived pesticide, Uroleucon gobonis, Indoor toxicity measurement, Field control efficacy