Field trials of an oil-based emulsifiable formulation of Beauveria bassiana conidia and low application rates of imidacloprid for control of false-eye leafhopper Empoasca vitis on tea in southern China

文献类型： 外文期刊

第一作者： Feng, MG

作者： Feng, MG;Pu, XY;Ying, SH;Wang, YG

作者机构：

关键词： Beauveria bassiana;Empoasca vitis;tea leafhoppers;emulsifiable formulation;mycoinsecticides;imidacloprid;microbial control

期刊名称：CROP PROTECTION （ 影响因子：2.571； 五年影响因子：3.11 ）

ISSN： 0261-2194

年卷期： 2004 年 23 卷 6 期

页码：

收录情况： SCI

摘要： A mineral oil-based emulsifiable preparation of Beauveria bassiana conidia was evaluated for field efficacy against false-eye leafhopper Empoasca vitis on tea in autumn of Yunnan Province (trial 1) and summer of Zhejiang Province (trial 2), China. In trial 1, tea plots were sprayed twice with a 14-day interval at the rates of 1.7, 2.5, and 5.0 x 10(13) conidia/ha alone or together with imidacloprid 10% WP at the low rates of 16.7, 25, and 50 g/ha, respectively. In trial 2, the plots on a hillside tea garden were sprayed twice with a 12-day interval at the rate of 1.7 x 1 013 conidia/ha alone or together with imidacloprid at the rate of 50 g/ha. Leafbopper counts made every three or five days showed a varying degree of leafhopper control after the first spray that was enhanced by the second spray. The high-rate of R bassiana and imidacloprid resulted in the most significant leafhopper control, yielding an overall mean efficacy of 69% (48-83%) in trial 1 and 67% (also 48-83%) in trial 2. The high-rate sprays of B. bassiana alone were only 39% (33-49%) efficient in trial 1, differing insignificantly from those at the lower application rates, and 50% (39-60%) in trial 2. The low-rate spray of imdacloprid alone in trial 2 also led to an efficacy of 50% (34-69%). Oil-based emulsifiable formulation of R bassiana containing imidacloprid 10% WP at a rate as low as less than or equal to 15% of its recommended rate (375-480 g/ha) could be incorporated into the tea leafhopper management system. However, leafhopper control by B. bassiana alone was less satisfactory. The effects of local weather pattern and leafhopper population structure on the field trial results are discussed. (C) 2003 Elsevier Ltd. All rights reserved.

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