Joseph Shimat V
University of California Cooperative Extension - Monterey County, Agriculture and Natural Resources.
J Econ Entomol. 2017 Dec 5;110(6):2471-2477. doi: 10.1093/jee/tox264.
Bagrada hilaris (Burmeister) (Hemiptera: Pentatomidae) is a serious pest of cruciferous crops in the central coast of California. Management of B. hilaris primarily involves the use of broad spectrum insecticides, such as pyrethroids and neonicotinoids, when the pest invades a crop field. Insect growth regulators (IGRs) are known for their efficacy on nymphal stages of B. hilaris, but little is known about their transovarial effects. Thus, the major objective of this study was to determine the transovarial effects of IGRs such as novaluron, diflubenzuron, and azadirachtin, when adults are exposed to direct topical spraying and dried residues. In addition, a direct topical spray of IGRs on older instars (fourth and fifth instars) was examined at 1-, 3-, and 7-d post-treatment. The number of young instars (first and second instars) and adults was recorded up to ~31 d after exposure. In the topical spray assays, the number of young instars was significantly lower for novaluron, diflubenzuron, and azadirachtin than for the nontreated control. The number of young instars that emerged after novaluron treatment was low (0-11%). In the assays with dried residues, the number of young instars that developed was significantly lower for novaluron treatment than for the other IGRs and the nontreated control. There was no significant difference among diflubenzuron, azadirachtin, and nontreated control treatments in the development of young instars. In the assays with a topical spray of IGRs on older instars, significantly more nymphs died at 3 and 7 d after exposure. The IGRs had no clear impact on adults.
黄斑蝽（Bagrada hilaris (Burmeister)）（半翅目：蝽科）是加利福尼亚州中部海岸十字花科作物的一种严重害虫。黄斑蝽的防治主要涉及在害虫侵入农田时使用广谱杀虫剂，如拟除虫菊酯类和新烟碱类。昆虫生长调节剂（IGRs）对黄斑蝽若虫阶段的防治效果显著，但对其经卵传递效应了解甚少。因此，本研究的主要目的是确定当成虫暴露于直接局部喷洒和干燥残留物时，虱螨脲、除虫脲和印楝素等昆虫生长调节剂的经卵传递效应。此外，在处理后1天、3天和7天，对大龄若虫（第四和第五龄）直接局部喷洒昆虫生长调节剂进行了检测。在暴露后约31天内记录低龄若虫（第一和第二龄）和成虫的数量。在局部喷洒试验中，虱螨脲、除虫脲和印楝素处理的低龄若虫数量显著低于未处理对照。虱螨脲处理后出现的低龄若虫数量很少（0 - 11%）。在干燥残留物试验中，虱螨脲处理发育出的低龄若虫数量显著低于其他昆虫生长调节剂和未处理对照。除虫脲、印楝素和未处理对照处理在低龄若虫发育方面没有显著差异。在对大龄若虫局部喷洒昆虫生长调节剂的试验中，暴露后3天和7天死亡的若虫明显更多。昆虫生长调节剂对成虫没有明显影响。
