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
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
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DOI：
10.1016/j.cropro.2003.10.004
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发表时间：
2004-06-01
期刊：
影响因子：
2.8
通讯作者：
Wang, YG
中科院分区：
文献类型：
--
作者：
Feng, MG;Pu, XY;Wang, YG
在云南秋季（试验1）和浙江夏季（试验2）进行了球孢白僵菌分生孢子矿物油基乳油防治茶树假眼小绿叶蝉的田间药效试验。在试验1中，以1.7、2.5和5.0 × 10（13）个分生孢子/公顷的比率单独或与10%吡虫啉WP一起以16.7、25和50 g/公顷的低比率分别喷洒茶园两次，间隔14天。试验2采用1.7 × 1013分生孢子/hm 2单用或与50 g/hm 2的吡虫啉混用，每12 d喷2次。每三天或五天进行一次的叶蝉计数显示出在第一次喷雾后不同程度的叶蝉控制，第二次喷雾增强了这种控制。球孢白僵菌和吡虫啉的高比率导致最显著的叶蝉控制，在试验1中产生69%（48-83%）的总体平均效力，在试验2中产生67%（也是48-83%）的总体平均效力。B的高剂量喷施。在试验1中，单独使用球孢白僵菌的有效率仅为39%（33-49%），与较低施用率的有效率差异不显著，而在试验2中为50%（39-60%）。在试验2中，单独使用吡虫啉的低速率喷雾也导致50%的功效（34-69%）。含10%吡虫啉可湿性粉剂的球孢霉油基乳油，其用量可低于或等于推荐用量（375-480 g/ha）的15%。而B对叶蝉的防治效果较差。单独的巴西纳不太令人满意。讨论了当地天气类型和叶蝉种群结构对田间试验结果的影响。(C)2003爱思唯尔有限公司。保留所有权利。
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.