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2009—2011年在广东连州、惠州、佛山、广州和广西柳州、江西信丰等多个华南区主要菜场开展小菜蛾对氯虫苯甲酰胺的抗药性监测。结果发现,与室内敏感种群的敏感基线相比(LC50=0.13 mg/L),各监测点在2009年秋季均为敏感水平,2010年秋季部分地区出现敏感性下降和低水平抗性,而2011年春季除了监测到敏感性下降和低水平抗性外,还发现个别监测点产生中等水平抗性,抗性上升趋势明显。随后,在广州增城菜区监测到一例对氯虫苯甲酰胺产生极高水平抗性的小菜蛾田间种群,其当代和F1代虫源的LC50值分别为78.78、59.14 mg/L,抗性倍数分别为606.00和454.92,达极高抗性水平。分析小菜蛾对氯虫苯甲酰胺产生抗药性的关键因素,认为过度依赖该药、随意提高施用剂量、不合理混配、连年连片单一种植模式等可能是有利于抗药性发展的关键因素。
In 2009-2011, the drug resistance of the diamondback moth (Plutella xylostella) to chlorantraniloxaban was monitored in a number of southern China farms in Lianzhou, Huizhou, Foshan, Guangzhou, Liuzhou, Guangxi and Xinfeng, Jiangxi. The results showed that compared with the sensitive baseline (LC50 = 0.13 mg / L) of sensitive indoor populations, all the monitoring sites were sensitive in the fall of 2009, and the sensitivity and the low level of resistance in some areas in the fall of 2010. In addition to the monitoring of the spring of the decline in sensitivity and low level of resistance, but also found that individual monitoring points have a moderate level of resistance, resistance increased significantly. Subsequently, in the Zengcheng District of Guangzhou City, a field population of diamondback moth, Plutella xylostella, exhibiting extremely high level of resistance to chlorantraniliprole was detected. The LC50 values of the current and F1 generation were 78.78 and 59.14 mg / L respectively, Respectively 606.00 and 454.92, reaching a very high level of resistance. To analyze the key factors that lead to the resistance of diamondback moth to chlorantraniliprole in the diamondback moth, the authors think over-reliance on the drug, random increase of dosage, unreasonable blending and continuous monoculture in successive years may be the key factors conducive to the development of drug resistance.