Potential of diatomaceous earth as a management tool against Acanthoscelides obtectus infestations

L. V. Viteri Jumbo, M. Pimentel, E. E. Oliveira, P. Toledo, Lêda Rita D'Antonino Faroni
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引用次数: 3

Abstract

The weevil Acanthoscelides obtectus (Say) (Coleoptera: Chrysomelidae: Bruchinae) is a cosmopolitan pest that causes high losses in stored beans in small storage units and especially on-farm storages. Here, it was tested the efficacy of the inert dust diatomaceous earth (DE) as an alternative to control A. obtectus in common beans (i.e., Phaseolus vulgaris L.) on different storage temperatures and exposure intervals. Using a Completely Randomized design four doses (0.25, 0.50, 0.75 and 1.00g kg-1) of diatomaceous earth on beans kept at different temperatures (25, 28, 30, 32 and 35°C). Insect mortality was evaluated after two or five days of exposure. The impacts of diatomaceous earth in the offspring of five days-exposed A. obtectus adults were evaluated. The offspring production (emerged adults) was evaluated 60 days after the exposure. The results revealed that A. obtectus mortality caused by diatomaceous earth was dose, temperature and exposure period dependent. For instance, at the lowest temperature (25°C), diatomaceous earth dose (0.25g kg-1 of beans) and exposure period of two days, the efficacy of diatomaceous earth was significantly reduced when compared to the other treatments. When applied at temperatures above 30°C, the diatomaceous earth treatments always resulted in A. obtectus mortality of at least 90%. Curiously, offspring production (F1) was reduced to over 95% in all diatomaceous earth, temperatures and exposure period treatments. Therefore, the results demonstrated that diatomaceous earth has the potential to be used as a tool to manage A. obtectus infestations in stored beans, considering that such control practice adequately reduced these insect infestations in several possible scenarios.
硅藻土作为一种防治棘藻侵害的管理工具的潜力
象鼻虫(鞘翅目:金曲蝇科:Bruchinae)是一种世界性的害虫,对储存在小仓库的豆子造成很大的损失,特别是在农场的仓库。试验了惰性粉尘硅藻土(DE)在不同贮藏温度和不同暴露时间下对普通豆(Phaseolus vulgaris L.)中褐僵螨的防治效果。采用完全随机设计,在不同温度(25、28、30、32和35°C)下的大豆上施用四种剂量(0.25、0.50、0.75和1.00g kg-1)的硅藻土。昆虫的死亡率在暴露2天或5天后进行评估。评价了硅藻土对暴露5 d的成虫后代的影响。在接触后60天评估子代产量(羽化成虫)。结果表明,硅藻土对蠋蝽的致死具有剂量、温度和暴露时间依赖性。例如,在最低温度(25°C)、硅藻土剂量(0.25g kg-1豆)和暴露时间为2天的情况下,硅藻土的效果与其他处理相比显著降低。当施用温度高于30°C时,硅藻土处理总是导致至少90%的白斑拟南芥死亡率。奇怪的是,在所有硅藻土、温度和暴露期处理下,后代产量(F1)降低到95%以上。因此,研究结果表明,考虑到硅藻土在几种可能的情况下充分减少了这些昆虫的侵扰,硅藻土有可能作为一种工具来管理储存豆中的伊蚊侵扰。
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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