Rod hook (alias, short-fronted negative locust, Chinese negative locust, pointed locust, small pointed locust and so on. ), short forehead negative locust? Chrysomya megacephala, an insect belonging to Chrysomyidae. This insect is widely distributed in Northeast China, North China, Northwest China, Central China, South China, Southwest China and Taiwan Province Province. It feeds on leaves by adults and nymphs, which affects the growth of plants and reduces the commercial value of vegetables.