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| Evaluation of Three Fungicides Control Efficacy on Strawberry Powdery Mildew |
| LI Na1 ☆，ZHANG Cong-shun1 ☆，ZHANG Tao2，SHI Yan-xia1，XIE Xue-wen1，CHAI A-li1，LI Bao-ju1* |
（1Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China；2Beijing Plant
Protection Station，Beijing 100029，China） |
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Abstract In order to evaluate the efficacy of 3 fungicides at different concentrations on strawberry powdery
mildew（Sphaerotheca aphanis），pot experiment and field trials were performed in the current study．The
results of pot experiment showed that 42.5% Pyraclostrobin·Fluxapyroxad SC diluted for 2 000 times showed the
highest control efficacy on strawberry powdery mildew occurring on the leaves，and its control efficacy reached
90.81%，significantly higher than that of the other treatments．The control efficacy of 30% Triflumizole WP and
50% Kresoxim-methyl WG in pot experiment were 85.58% and 76.21%，respectively．In the field trials，42.5%
Pyraclostrobin·Fluxapyroxad SC diluted for 2 000 times produced the best efficacy against strawberry powdery
mildew on leaves and fruits．Their control rates were 98.20% and 67.49%， respectively．While，the best control
efficacy of 30% Triflumizole WP were 74.72% and 60.78%， respectively．The best control efficacy of 50%
kresoxim-methyl WG were 76.00% and 49.01%，respectively．Therefore，these 3 fungicides showed different
efficacities against strawberry powdery mildew and all had no injury，all these 3 fungicides produced better efficacy
on strawberry powdery mildew occurring at leaves than on fruits．
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Received: 17 February 2014
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