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中文摘要：
烟粉虱Q隐种是近几年新传入我国的入侵烟粉虱，主要危害蔬菜、棉花和花卉等经济作物，对多种化学农药都产生了很高的抗药性。为了了解吡虫啉不同施药方式对丽蚜小蜂控制烟粉虱效果的影响，本研究在实验室条件下，调查了经吡虫啉叶面处理和灌根处理两种不同施药方式处理，烟粉虱Q隐种的存活率、丽蚜小蜂的存活率和寄生率。结果表明：1、5、10、50mg·L^-1。浓度吡虫啉灌根处理的丽蚜小蜂校正死亡率分别为21．8％、14．9％、19．3％、16．2％；1、5、50mg·L^-1浓度吡虫啉叶面处理的丽蚜小蜂校正死亡率分别为52．2％、81．8％、93-3％。相同浓度的吡虫啉处理中，叶面处理的丽蚜小蜂死亡率显著高于灌根处理；在吡虫啉和丽蚜小蜂协同作用中，用浓度5、10、50mg·L^-1的吡虫啉灌根处理时，烟粉虱的死亡率分别为41．5％、39．1％、45．9％，丽蚜小蜂寄生率分别为11．9％、15．9％、7．9％；用浓度5、50mg·L^-1的吡虫啉叶面处理时，烟粉虱的死亡率分别为12．6％、37.2％，丽蚜小蜂寄生率均为2％左右。灌根处理对寄生蜂的存活率影响较小，且有利于丽蚜小蜂对烟粉虱的寄生和取食；而叶面处理显著降低了寄生蜂的存活率及寄生率。
英文摘要：
The Q biotype of Bemisia tabaci, an economically important invasive cryptic species, is a destructive pest of agricultural and horticultural crops, with broad geographical distribution in China, and of high resistance to some classes of insecticides. This paper investigated the biocontrol potential of Encarsiaformosa against B. tabaci as affected by systemic and foliar applications ofimidacloprid. Results showed that, with systemic treatment of 1, 5, 10, 50 mg.L-1 of imidacloprid, mortalities of E. fomosa were 21.8%, 14.9%, 19.3 %, 16.2%, respectively; and with foliar treatment of 1, 5, 50 mg.L-~ of imidacloprid, the mortalities were 52.2%, 81.8%, 93.3%, respectively. Obviously, at the same concentration of imidacloprid, mortality ofE. fomosa was higher in foliar treatment than in systemic treatment. When imidacloprid was applied in conjunction with wasp release, mortalities orB. tabaci were 41.5%, 39.1% and 45.9% and parasitisms by E. formosa were 11.9%, 15.9% and 7.9% for systemically applied 5, 10, 50 mg·L^-1 of imidacloprid, respectively, while for foliar treatment of 5, 50 mg·L^-1 of imidacloprid, mortalities orB. tabaci were 12.6% and 37.2%, respectively, and parasitisms were about 2%. Thus systemic application of imidacloprid in conjunction with release of natural enemies can afford substantial control ofB. tabaci and protection of parasitoids, whereas the traditional foliar application is harmful for E. formosa.
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