基于性信息诱捕监测广东桔小实蝇和瓜实蝇发生动态及其对2种常用农药的抗药性评价

利用性信息素诱捕的方法对广东省茂名、佛山、梅州和韶关的桔小实蝇Bactrocera dorsalis (Hendel)和瓜实蝇Bactrocera cucurbitae (Coquillett)种群动态进行监测；并用药膜法测定了两种实蝇不同地理种群成虫对阿维菌素和甲维盐的抗药性情况。结果表明，桔小实蝇和瓜实蝇在所监测的4个地市全年均有发生，桔小实蝇和瓜实蝇种群数量发生高峰期集中在5月中旬至8月中旬，从4月中旬开始田间种群数量开始增加，10月中旬以后种群数量急剧下降，高峰期与果实成熟期基本吻合。抗药性监测结果表明，桔小实蝇和瓜实蝇对阿维菌素和甲维盐的抗药性有逐年上升趋势，广东4个地市桔小实蝇和瓜实蝇已对阿维菌素产生中等抗性水平；2019年11月监测梅州地区桔小实蝇种群和韶关瓜实蝇种群对甲维盐抗性倍数分别为4.32和3.42倍，仍处于敏感水平，其余地区种群对甲维盐均达到了低水平或中等水平抗性。

Monitoring occurrence dynamics based on sexpheromone trapping and evaluation of two commonly used pesticides resistance of Bactrocera dorsalis and Bactrocera cucurbitae in the field of Guangdong

A sex pheromone trapping method was used to monitor the adult population dynamics of Bactrocera dorsalis and Bactrocera cucurbitae in Maoming, Foshan, Meizhou and Shaoguan, Guangdong Province, China. The pesticides resistance of two kinds of fruit fly adults to two different types of pesticides (abamectin and emamectin benzoate) were tested with residual film method in different geographical populations. The results suggested that B. dorsalis and B. cucurbitae occurred all year round in the four monitoring points. The fastigium of population quantity of B. dorsalis and B. cucurbitae occurred from mid-May to mid-August. The amount of population went up from mid-April. After that, the fly population declined remarkably after mid-October, which was basically consistent with the ripening stage of fruit. The resistance monitoring results showed that the resistance of B. dorsalis and B. cucurbitae to abamectin and emamectin benzoate increased year by year. The resistance to abamectin showed, B. dorsalis and B. cucurbitae had already been middle level in the four monitoring points in Guangdong Province. In November 2019, the resistance monitoring of B. dorsalis populations in Meizhou and B. cucurbitae populations in Shaoguan to emamectin benzoate were 4.32 and 3.42, respectively. The above resistance ratios indicated that these populations were still susceptible. The populations collected from other areas showed low-level or intermediate-level resistance.