High resistance levels in brazilian Plutella xylostella populations: needs for adjustments in field concentration

IF 0.9 4区农林科学 Q3 AGRONOMY

Revista Caatinga Pub Date : 2023-03-01 DOI:10.1590/1983-21252023v36n106rc

J. G. D. S. Silva Filho, T. I. D. Farias, I. A. D. Melo, K. Santoro, S. Anton, C. Badji

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Abstract

ABSTRACT Plutella xylostella cause severe damage on cruciferous plants all over the world. Farmers in several regions of Brazil report increasing inefficiency of chemical control, even when using high insecticide concentrations. We evaluate here the susceptibility of brazilian diamondback moth populations to the Premio® (Chlorantraniliprole), Dipel® (Bacillus thuringiensis var. kurstaki) and Lannate® BR (Oxime Methylcarbamate) insecticides, frequently used in Brazil. Susceptibility bioassays with five field-collected and two laboratory diamondback moth populations were conducted with increasing concentrations of insecticides up to ten times above the recommended concentration. Extremely high and region-dependent resistances were found in field populations against Chlorantraniliprole and B. thuringiensis, with Resistance Ratios up to 370.0 times for the Camocim de São Felix population. For Oxime Methylcarbamate, we were not able to do Probit analyses for the field populations because of very low mortality rates. Laboratory populations showed resistance to the three tested insecticides with all LC50 concentrations exceeding the recommended doses by at least 3 times. Our results show strong and variable resistance to the three tested insecticides according to the region of origin. To maintain efficient pest control in a large country like Brazil, local levels of resistance need therefore to be monitored by the authorities and reassessment and adjustments of regional doses of insecticides should be implemented as a public policy, to prevent massive spread of insecticides in the field, as well as increases in cases of resistance.

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巴西小菜蛾种群的高抗性水平：需要调整田间浓度

摘要：小菜蛾对世界各地十字花科植物造成严重危害。巴西几个地区的农民报告说，即使在使用高浓度杀虫剂的情况下，化学控制的效率也越来越低。我们在这里评估了巴西小菜蛾种群对巴西经常使用的Premio®（氯虫腈）、Dipel®（苏云金芽孢杆菌变种kurstaki）和Lannate®BR（肟甲基氨基甲酸酯）杀虫剂的易感性。对五个野外采集的小菜蛾种群和两个实验室小菜蛾种群进行了敏感性生物测定，杀虫剂浓度比推荐浓度高出十倍。田间群体对氯虫腈和苏云金芽孢杆菌具有极高的区域依赖性抗性，Camocim de São Felix群体的抗性比高达370.0倍。对于肟甲基氨基甲酸酯，由于死亡率非常低，我们无法对现场人群进行Probit分析。实验室人群对三种测试的杀虫剂表现出耐药性，所有LC50浓度都超过了推荐剂量至少3倍。我们的研究结果显示，根据来源地区的不同，对三种测试杀虫剂的抗性强且可变。因此，为了在巴西这样的大国保持有效的害虫控制，当局需要监测当地的抗药性水平，并应将重新评估和调整区域杀虫剂剂量作为一项公共政策来实施，以防止杀虫剂在田间大规模传播，以及抗药性病例的增加。

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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来源期刊

Revista Caatinga AGRONOMY-

CiteScore

2.10

自引率

11.10%

发文量

审稿时长

6-12 weeks

期刊介绍： A Revista Caatinga é uma publicação científica que apresenta periodicidade trimestral, publicada pela Pró-Reitoria de Pesquisa e Pós-Graduação da Universidade Federal Rural do Semi-Árido – UFERSA, desde 1976. Objetiva proporcionar à comunidade científica, publicações de alto nível nas áreas de Ciências Agrárias e Recursos Naturais, disponibilizando, integral e gratuitamente, resultados relevantes das pesquisas publicadas.