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Stability of insecticide resistance in Frankliniella occidentalis to acrinathrin, formetanate and methiocarb

机译:西方富兰克氏菌对杀螨灵,甲酸酯和甲硫威的杀虫剂抗药性稳定

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1 The stability of the resistance in the Western Flower Thrips, Frankliniella occidentalis (Pergande) to selective insecticides (acrinathrin, formetanate and methiocarb) was studied in both laboratory and field conditions. 2 In laboratory strains reared over a sufficient number of generations in insecticide free-conditions, levels of resistance were stable. 3 Laboratory strains selected for resistance showed moderate to very high levels of resistance. In the strain ACR9, very highly resistant to acrinathrin [resistance factor (RF) > 1000-fold], resistance was maintained with little change after 5 and 8 months without acrinathrin exposure. In the MET9 strain, resistance to methiocarb (RF = 40) was maintained after 5 months without selection pressure (RF = 33). However, 3 months later, there was a significant increase in the susceptibility to this insecticide (RF = 10). The formetanate resistance in the FOR7 strain showed a no significant decline during the 8 months without selection (from RF = 31 to RF = 17). 4 The field-collected strains from sweet pepper greenhouses (PTF4, PP2 and PM5) showed a marked fall in the LC to acrinathrin and methiocarb, and a slight decrease to formetanate, after being reared in the laboratory in the absence of selection pressure for 8 months. 5 In greenhouses, a significant fall in resistance to the selected insecticides was produced when insecticide pressure was withdrawn, at the end of the season, probably caused by the immigration of thrips from nearby crops or weeds, and the dilution of resistance through interbreeding with susceptible individuals. 6 Factors influencing stability or reversion of insecticide resistance are discussed.
机译:1在实验室和田间条件下,都研究了西花蓟马,富兰克氏菌(Pergande)对选择性杀虫剂(阿奇那林,甲酸盐和甲硫威)的抗性稳定性。 2在无杀虫剂条件下饲养足够多代的实验室菌株中,耐药水平稳定。 3个为抗性选择的实验室菌株显示出中等至非常高的抗性水平。 ACR9菌株对丙烯酰丝氨酸耐药性非常高[耐药因子(RF)> 1000倍],在不暴露丙烯酰丝氨酸的情况下5和8个月后,耐药性几乎没有变化。在MET9菌株中,对甲硫威(RF = 40)的抗性在5个月后仍保持无选择压力(RF = 33)。但是,三个月后,对这种杀虫剂的敏感性显着增加(RF = 10)。在没有选择的情况下,FOR7菌株的甲酸盐抗性在8个月内没有显着下降(从RF = 31到RF = 17)。 4从甜椒大棚(PTF4,PP2和PM5)现场收集的菌株在实验室中在没有选择压力的情况下进行饲养后,在LC上显着下降到了手足素和甲硫威,而甲酸盐的含量略有下降。个月。 5在温室中,当季末撤除杀虫剂压力时,对所选杀虫剂的抗药性明显下降,这可能是由于附近农作物或杂草的蓟马移入,以及与易感性的杂交导致抗药性减弱个人。 6讨论了影响稳定性或杀虫剂抗性恢复的因素。

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