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| Screening Effective Pesticides to Control Bemisia tabaci |
| SUN Hai1，ZHENG Xiang2，WANG Xiao-qing1，LI Yun-long1，HU Bin1，WANG Yin1，ZHENG Jian-qiu1 |
| （1Plant Protection Station of Beijing，Beijing 100029，China；2Daxing District Modern Agricultural Technology Innovation Service Center，Beijing 102600，China） |
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Abstract 5 kinds of new or mixed pesticides〔20% allyl isothiocyanate EW（AITC），99% petroleum oil EC，mixture of 22.4% spirotetramat SC and 20% nitenpyram WG，mixture of 240 g·L-1 spirodiclofen SC and 20% nitenpyram WG，Bemisia tabaci No.1〕were applied in fields to carry out pesticide effect and phytotoxicity experiments，and to evaluate the fast-acting property，durable effect and security of pesticides control effect．The results indicated that all these 5 pesticides had no injury at the recommended dose．The mixture of 22.4% spirotetramat SC and 20% nitenpyram WG showed better effect on controlling Bemisia tabaci，its durable effect was obvious compared with the contrast 20% nitenpyram，the control efficacy reached 65.6% 3 days after
spraying，then to 84.5% 20 days after spraying．This mixed pesticide could be used to control Bemisia tabaci．3 days after taking 99% petroleum oil EC，the control efficacy on Bemisia tabaci reached 53.0%，so it possessed a great potential in controlling Bemisia tabaci in organic and green agriculture production．20% AITC had fast acting effect on Bemisia tabaci，its control efficacy could reach 70.9% 3ays after spraying，but its durable effect was not ideal．Therefore，when Bemisia tabaci was prevailing，AITC should be rapidly applied and combined with other pesticides，which had long-lasting effect to control Bemisia tabaci ．While Bemisia tabaci No.1 and the mixture of 240 g·L-1 spirodiclofen SC and 20% nitenpyram WG were not suitable for controlling Bemisia tabaci considering a prevention effect，cost and ease of operation and other factors．
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Received: 03 April 2015
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