Effects of imidacloprid-sodium chloride association on survival and reproduction of the stink bug Podisus nigrispinus

G. S. Ramos, P. Paulo, P. Toledo, K. Haddi, J. C. Zanuncio, E. E. Oliveira
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引用次数: 6

Abstract

Pesticide effects on natural enemies in an agroecosystem are of paramount importance for integrated pest management programs. Natural enemies can be subject to direct and indirect exposure to insecticides and synergistic molecules (e.g., sodium chloride - NaCl) which are used to control various pests of agricultural crops such as soybean. Here, we evaluated the potential effects of imidacloprid and its interaction with NaCl as an enhancer on the survival and reproductive abilities of the non-target predator Podisus nigrispinus (Dallas) (Hemiptera: Pentatomidae). The insects were exposed to the stink bugs control field recommended dose of imidacloprid associated or not with the salt at the concentration of 0.5% (w/v). NaCl as a pesticide enhancer did not affect  the survival of  P. nigrispinus adults after 48 h of exposure (less than 12% of mortality was always recorded). However, the fifth instar nymph mortality was almost 50%. The effects of imidacloprid on the reproductive parameters of P. nigrispinus included a decrease in the oviposition, showing fewer eggs per day. However, the fertility was not affected. The NaCl addition, therefore, had no effect on the mortality, survival, and reproduction of the non-target predator. The use of NaCl associated to imidacloprid and other pesticides in the presence of P. nigrispinus demonstrated compatibility, however, it requires further evaluation to endorse the set of these pest control strategies.
吡虫啉-氯化钠联用对黑足虱存活和繁殖的影响
农药对农业生态系统中天敌的影响是害虫综合治理的重要内容。天敌可直接或间接暴露于杀虫剂和协同分子(如氯化钠- NaCl),这些分子用于控制大豆等农作物的各种害虫。本研究评估了吡虫啉及其与NaCl互作对非目标捕食者黑足鼠(半翅目:蝽科)生存和繁殖能力的潜在影响。以0.5% (w/v)浓度的吡虫啉配盐和不配盐,在臭虫防治场推荐剂量下处理。NaCl作为农药增强剂,在暴露48 h后不影响黑皮黑豆成虫的存活(总死亡率低于12%)。然而,五龄若虫的死亡率几乎为50%。吡虫啉对黑皮弓形虫生殖参数的影响包括产卵量减少,每天产卵数减少。然而,生育能力不受影响。因此,NaCl的添加对非目标捕食者的死亡率、存活率和繁殖没有影响。NaCl与吡虫啉和其他杀虫剂在黑皮弓形虫存在下的配伍效果较好,但需要进一步评价这些防治策略的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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