Greene A Daniel, Yang Xiangbing, Velazquez-Hernandez Yisell, Vargas German, Kendra Paul E, Mannion Catharine, Revynthi Alexandra M
Entomology and Nematology Department, Tropical Research and Education Center, University of Florida, 18905 SW 280th St., Homestead, FL 33031, USA.
Subtropical Horticulture Research Station, United States Department of Agriculture, Agricultural Research Service, Miami, FL 33158, USA.
Insects. 2023 Jun 11;14(6):544. doi: 10.3390/insects14060544.
In 2017, the hibiscus bud weevil (HBW), Linell (Coleoptera: Curculionidae), was found outside of its native range of Mexico and Texas, infesting hibiscus plants in Florida. Therefore, we selected 21 different insecticide and horticultural oil products to evaluate their effects on the reproductive rate, feeding, and oviposition behavior of the HBW. In laboratory experiments, significant mortality was observed in adult weevils exposed to diflubenzuron-treated hibiscus leaves and buds, and hibiscus buds treated with diflubenzuron contained the fewest number of eggs and feeding/oviposition holes. Among horticultural oil products, significant mortality was only observed in experiments in which adult weevils were directly sprayed (direct experiments). Pyrethrins and spinetoram plus sulfoxaflor reduced the oviposition rate and caused significant mortality in direct experiments. Diflubenzuron, pyrethrins, spinetoram plus sulfoxaflor, and spirotetramat were further tested via contact toxicity experiments and greenhouse experiments. Contact toxicity experiments demonstrated that the tested insecticides (except diflubenzuron) were highly toxic to HBW adults. In greenhouse experiments, only those hibiscus plants treated with pyrethrins had significantly fewer feeding/oviposition holes and larvae within their flower buds when compared to control (water-treated) plants. These results constitute an important first step in the identification of effective chemical control options for the HBW.
2017年，芙蓉花蕾象鼻虫（HBW），Linell（鞘翅目：象甲科），在其原生范围墨西哥和德克萨斯州以外被发现，侵害了佛罗里达州的芙蓉属植物。因此，我们选择了21种不同的杀虫剂和园艺油产品来评估它们对芙蓉花蕾象鼻虫繁殖率、取食和产卵行为的影响。在实验室实验中，观察到接触经敌氟虫脲处理的芙蓉叶和花蕾的成年象鼻虫有显著死亡率，并且用敌氟虫脲处理的芙蓉花蕾所含的卵以及取食/产卵孔数量最少。在园艺油产品中，仅在成年象鼻虫被直接喷洒的实验（直接实验）中观察到显著死亡率。除虫菊酯以及多杀霉素加氟啶虫胺腈在直接实验中降低了产卵率并导致显著死亡率。敌氟虫脲、除虫菊酯、多杀霉素加氟啶虫胺腈以及螺虫乙酯通过接触毒性实验和温室实验进一步测试。接触毒性实验表明，所测试的杀虫剂（除敌氟虫脲外）对芙蓉花蕾象鼻虫成虫具有高毒性。在温室实验中，与对照（水处理）植物相比，仅用除虫菊酯处理的芙蓉属植物在其花蕾内的取食/产卵孔和幼虫显著更少。这些结果是鉴定针对芙蓉花蕾象鼻虫有效化学防治方法的重要第一步。
