2017—2019年江西省二化螟种群对四种杀虫剂的抗性

为明确近年来江西省二化螟种群对常用杀虫剂的抗性水平，提出合理化用药建议，本研究采用人工饲料浸药法测定2017—2019年江西省13个县（市）二化螟田间种群对氯虫苯甲酰胺、阿维菌素、三唑磷和杀虫单的抗性。结果表明，13个二化螟种群对氯虫苯甲酰胺的抗性水平整体为中等至高水平抗性，其中有11个二化螟种群对氯虫苯甲酰胺的抗性水平整体为上升趋势，在对氯虫苯甲酰胺抗性水平增加的种群中，都昌种群的抗性倍数从2017年的44.1倍上升至2018年的65.1倍，在2019年激增至高水平抗性，抗性倍数为283.5倍，为供试种群的最高抗性倍数。13个二化螟种群对阿维菌素的抗性水平整体为中等偏下，在对阿维菌素抗性水平增加的种群中，南昌种群的抗性倍数最高，2017—2019年分别为74.8倍、108.7倍和80.6倍。13个二化螟种群对三唑磷的抗性水平整体为中等偏下，其中新干、永修、万安、大余、上高和都昌这6个种群对三唑磷的抗性水平呈波动上升的趋势，而其他7个种群对三唑磷的抗性水平为波动性变化，偶有下降。13个二化螟种群对杀虫单的抗性水平整体为中等偏下并且有明显下降趋势，其中大余、永修、泰和、会昌、新干和上高这6个种群对杀虫单的抗性水平呈明显的下降趋势；其他7个种群对杀虫单的抗性水平则为波动性上升趋势。建议限制氯虫苯甲酰胺的使用次数，在抗性水平高、田间防治效果差的地区暂停使用双酰胺类杀虫剂；此外，应减少阿维菌素的用量，轮换使用三唑磷和杀虫单。

Resistance of Asiatic rice borer Chilo suppressalis (Lepidoptera: Crambidae) population to four insecticides in Jiangxi Province from 2017 to 2019

In order to determine the resistance level of Asiatic rice borer Chilo suppressalis to commonly used insecticides in recent years in Jiangxi Province and put forward the rational suggestions for insecticide use, the resistance of C. suppressalis to four insecticides, chlorantraniliprole, avermectin, triazophos and monosultap, was measured in 13 counties or cities in Jiangxi Province in 2017-2019 by using the artificial feed dipping method. The results showed that 13 populations of C. suppressalis developed medium to high resistance to chlorantraniliprole on the whole, and the resistance level of 11 populations exhibited an upward trend as a whole; besides, among the populations with increasing resistance level to chlorantraniliprole, the resistance ratio (RR) of Duchang population increased from 44.1 times in 2017 to 65.1 times in 2018, followed by a sharp increase to 283.5 times in 2019, which was the highest of 13 populations. The resistance level of 13 populations to avermectin was below medium, and in all the populations with increasing resistance level, the RR of Nanchang population was the highest, which was 74.8, 108.7 and 80.6 times in 2017, 2018, and 2019, respectively. The resistance level of 13 C. suppressalis populations to triazophos was generally moderate or low; the resistance level of Xingan, Yongxiu, Wan'' an, Dayu, Shanggao and Duchang populations to triazophos displayed a fluctuating upward trend, while the other seven populations showed a fluctuating change with an occasional downward trend. The resistance level of 13 populations to monosultap was lower than medium with a significant downward trend. The resistance level of Dayu, Yongxiu, Taihe, Huichang, Xingan and Shanggao populations to monosultap exhibited a significant downward trend. Nevertheless, the resistance level of the other seven populations to monosultap had a fluctuating upward trend. It is concluded that the use of chlorantraniliprole should be limited and even suspended in areas with high resistance level and poor control effect. In addition, the dosage of avermectin should be reduced, and triazophos and monosultap should be used alternately.