Lahiri Sriyanka, Roberts Phillip M, Toews Michael D
Department of Entomology, University of Georgia, Tifton Campus, Tifton, GA.
J Econ Entomol. 2019 Feb 12;112(1):181-187. doi: 10.1093/jee/toy320.
Thrips are early-season pests of cotton and can cause yield and stand losses if not managed. Strip tillage into a winter cover crop, use of a neonicotinoid seed treatment, and foliar insecticide applications are all reliable pest management tactics, but how these methods interact with each other in a thrip-cotton agroecosystem needs to be further understood. A 2-yr field study was conducted to compare thrip counts and thrip-induced plant injury as a function of tillage practice (conventional vs strip tillage with heavy rolled rye), thiamethoxam seed treatment, and foliar insecticide application for managing thrips in cotton. Adult and nymph density, seedling biomass, true leaf formation, stand count, and lint yield were assessed. Results indicate that heavy rolled rye was effective for mitigating thrips on seedling cotton. On conventionally tilled fields, the neonicotinoid seed treatment and a foliar insecticide application were necessary for maximizing yield. Spinetoram was more efficacious than either acephate or cyantraniliprole for management of immature thrips; however, there were no yield effects attributed to foliar insecticide application. These data suggest that growers can mitigate early-season thrips using both cultural and chemically based management tactics.
蓟马是棉花生长早期的害虫，如果不加以防治，会导致产量损失和棉株数量减少。将条耕法应用于冬季覆盖作物、使用新烟碱类种子处理剂以及进行叶面杀虫剂喷施都是可靠的害虫防治策略，但这些方法在蓟马 - 棉花农业生态系统中如何相互作用仍需进一步了解。开展了一项为期两年的田间研究，以比较作为耕作方式（传统耕作与带重型碾压黑麦的条耕法）、噻虫嗪种子处理和叶面杀虫剂喷施函数的蓟马数量及蓟马引起的植株损伤，这些措施用于防治棉花中的蓟马。评估了成虫和若虫密度、幼苗生物量、真叶形成、棉株数量和皮棉产量。结果表明，重型碾压黑麦对减轻棉苗上的蓟马有效。在传统耕作的田块上，新烟碱类种子处理和叶面杀虫剂喷施对于实现产量最大化是必要的。多杀霉素在防治未成熟蓟马方面比乙酰甲胺磷或氰虫酰胺更有效；然而，叶面杀虫剂喷施对产量没有影响。这些数据表明，种植者可以通过文化和化学防治策略减轻生长早期的蓟马危害。
