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目的:了解化橘红基地曲牙土天牛Dorysthenes hydropicus生物学特性,为有效防治提供科学依据。方法:通过田间调查、室内饲养及灯诱了解曲牙土天牛生物学及发生与为害特性。结果:曲牙土天牛在化橘红基地1~2年发生1代,以幼虫在土中越冬;5月下旬为成虫羽化出土盛期。成虫个体差异大,体长25~63 cm;趋光性强,1个诱集点每晚可以诱集成虫2 000多头;雌成虫抱卵量大,最多达543粒,成虫产卵于1~3 cm深土中,卵孵化盛期为6月下旬~7月上旬,孵化率达85%以上,幼虫在15~60 cm土层内取食危害。结论:曲牙土天牛在广东危害化橘红、白木香等均为首次报道,对化橘红生产威胁极大,是化橘红基地重点防治对象。
OBJECTIVE: To understand the biological characteristics of Dorysthenes hydropicus in the orange tangerine base and provide a scientific basis for effective prevention and treatment. Methods: The biology, occurrence and pests characteristics of Codiaquae celastrus were studied through field investigation, indoor feeding and light luring. Results: Aralia elata occurred in the orange-red base for 1 to 2 years, with larvae overwintering in the soil. In late May, adult eclosion emerged. Adults vary widely in body length from 25 cm to 63 cm. They have a strong phototaxis and can trap more than 2,000 adult adults per night at a single trap site. Female adults hold up to 543 large spawning eggs and lay eggs at 1 to 3 cm depth Soil, egg hatch peak for the late June to early July, hatching rate of 85% or more, larvae in the 15 ~ 60 cm soil layer feeding hazards. CONCLUSION: The first occurrence of Alnus clarkiae in Guangdong is the first report about the harmful orange, white woody, etc.