Ayyappath R, Polavarapu S, McGuire M R
Blueberry and Cranberry Research & Extension Center, Rutgers University, Chatsworth, NJ 08019, USA.
J Econ Entomol. 2000 Oct;93(5):1473-9. doi: 10.1603/0022-0493-93.5.1473.
Studies were conducted to evaluate the mortality of blueberry maggot, Rhagoletis mendax Curran, flies exposed to thiamethoxam- and imidacloprid-coated biodegradable (8-cm-diameter) red spheres, under both laboratory and field conditions. Laboratory studies with spheres coated with 0.1-2.0% (AI) of thiamethoxam indicated that they are effective against R. mendax; however, no dose-dependent response was observed. Studies on the effect of visitation time on thiamethoxam-coated spheres showed a decrease in R. mendax mortality as the duration of visitation time decreased from 60 to 10 s. Under field conditions, significantly more flies were captured on Plexiglas panes below the 2% (AI) thiamethoxam-coated spheres when compared with similar panes below untreated spheres. In field evaluations of thiamethoxam- and imidacloprid-coated spheres, imidacloprid-coated spheres (2.0% [AI]) were found to be significantly more effective than thiamethoxam-coated spheres (0.5-4.0% [AI]). Field trials to characterize the levels of mortality associated with aging pesticide-coated spheres revealed that the effectiveness of treated spheres decreased with increasing age of sphere, and this reduction in effectiveness is greater in thiamethoxam-coated spheres than in imidacloprid-coated spheres. These results provide comparative data on the effectiveness of thiamethoxam- and imidacloprid-coated spheres and support the potential of using pesticide-treated spheres for control of blueberry maggot flies.
开展了多项研究，以评估在实验室和田间条件下，暴露于噻虫嗪和吡虫啉包衣的可生物降解（直径8厘米）红色球体的蓝莓实蝇（Rhagoletis mendax Curran）成虫的死亡率。用0.1%-2.0%（活性成分）噻虫嗪包衣的球体进行的实验室研究表明，它们对蓝莓实蝇有效；然而，未观察到剂量依赖性反应。关于访视时间对噻虫嗪包衣球体影响的研究表明，随着访视时间从60秒减少到10秒，蓝莓实蝇的死亡率降低。在田间条件下，与未处理球体下方的类似玻璃板相比，在2%（活性成分）噻虫嗪包衣球体下方的有机玻璃板上捕获的果蝇明显更多。在噻虫嗪和吡虫啉包衣球体的田间评估中，发现吡虫啉包衣球体（2.0%[活性成分]）比噻虫嗪包衣球体（0.5%-4.0%[活性成分]）显著更有效。表征与老化农药包衣球体相关的死亡率水平的田间试验表明，处理过的球体的有效性随着球体年龄的增加而降低，并且噻虫嗪包衣球体的有效性降低幅度大于吡虫啉包衣球体。这些结果提供了关于噻虫嗪和吡虫啉包衣球体有效性的比较数据，并支持使用农药处理过的球体控制蓝莓实蝇成虫的潜力。
