Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada.
Pest Manag Sci. 2009 Dec;65(12):1329-36. doi: 10.1002/ps.1818.
The cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham), is a major pest in the production of canola (Brassica napus L.) in North America and Europe, and effective population control is often essential for economical crop production. In North America, neonicotinoid insecticides have been used for several years in canola as seed treatments for reducing herbivory by flea beetles. The neonicotinoids clothianidin and imidacloprid were investigated to determine their effects on preimaginal development and on emergence of new-generation adults of C. obstrictus in comparison with effects of lindane, a chlorinated hydrocarbon seed treatment.
Mean numbers of second- and third-instar larvae were significantly higher in plants seed-treated with lindane than in plants treated with the neonicotinoid compounds, even though weevil oviposition was similar for all treatments. Emergence of new-generation adults was reduced by 52 and 39% for plants seed-treated with clothianidin and imidacloprid, respectively, compared with emergence from plants treated with lindane.
Seed treatment with both clothianidin and imidacloprid produced systemic insecticidal effects on larvae of C. obstrictus, with clothianidin slightly more effective than imidacloprid. Use of clothianidin or imidacloprid as seed treatments can comprise an important component in the integrated management of cabbage seedpod weevil in canola.
芜菁甘蓝象甲（Ceutorhynchus obstrictus (Marsham)）是北美和欧洲油菜（Brassica napus L.）生产中的主要害虫，通常需要有效控制种群以实现经济作物生产。在北美，多年来一直将新烟碱类杀虫剂作为油菜种子处理剂用于防治叶甲的取食。本研究调查了噻虫啉和吡虫啉对芜菁甘蓝象甲幼虫预蛹发育和新一代成虫羽化的影响，并与氯化烃种子处理剂林丹进行了比较。
尽管所有处理的象甲产卵量相似，但用林丹处理的植物上的二龄和三龄幼虫的平均数量明显高于用新烟碱类化合物处理的植物。与林丹处理的植物相比，用噻虫啉和吡虫啉处理的植物新一代成虫的羽化率分别降低了 52%和 39%。
噻虫啉和吡虫啉的种子处理对芜菁甘蓝象甲幼虫产生了系统的杀虫作用，噻虫啉的效果略优于吡虫啉。用噻虫啉或吡虫啉作为种子处理可以成为油菜芜菁甘蓝象甲综合治理的重要组成部分。
