广东省稻水象甲生活史及越冬规律  

Life cycle and overwintering rules of Lissorhoptrus orvzophitus(Coleoptera:Curculionidae)in Guangdong province,South China

作　　者：袁龙宇 雷浩霖 李燕芳[1,2] 肖汉祥 魏洪义[3] 张振飞 YUAN Long-Yu;LEI Hao-Lin;LI Yan-Fang;XIAO Han-Xiang;WEI Hong-Yi;ZHANG Zhen-Fei(Plant Protection Research Institute,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China;Guangdong Provincial Key Laboratory of High Technology for Plant Protection,Guangzhou 510640,China;School of Agronomy Science,Jiangxi Agricultural University,Nanchang 330045,China)

机构地区：[1]广东省农业科学院植物保护研究所,广州510640 [2]广东省植物保护新技术重点实验室,广州510640 [3]江西农业大学农学院,南昌330045

出　　处：《昆虫学报》2023年第9期1192-1200,共9页Acta Entomologica Sinica

基　　金：国家重点研发计划项目(2022YFC2601400);2021年广东省乡村振兴战略专项省级项目(稻水象甲监测防控技术研究与推广应用);广东省现代农业产业共性关键技术研发创新团队建设项目(2021KJ134)。

摘　　要：【目的】明确广东省稻水象甲Lissorhoptrus orvzophitus生活史、越冬生境、发生规律及寄主植物和天敌种类,为这一害虫的科学防治提供指导。【方法】2019年3月-2021年4月通过实地调查、室内笼罩饲养观察和卵巢解剖研究稻水象甲在广东的生活史和越冬生境;通过对稻水象甲成虫中肠内容物进行分子检测探明其越冬过渡寄主植物;利用特征序列扩增区(sequence characterized amplified region,SCAR)标记技术明确稻水象甲的主要天敌种类。【结果】2019年3月-2021年4月稻水象甲在广东双季稻区一年发生2代,具有越冬和越夏习性。广东稻水象甲经历一个完整世代需要(140.86±1.05)d,幼虫历期为20 d左右。广东稻水象甲以成虫越冬,越冬生境模式为稻田-过渡带(草地)-沼泽地(水草丰盛),且越冬期稻水象甲成虫卵巢存在滞育现象,发育等级Ⅰ级。稻水象甲成虫中肠内容物分子检测发现,其越冬期主要的过渡寄主植物为再生稻及李氏禾Leersia hexandra。基于SCAR的PCR结果表明,游猎型蜘蛛沟渠豹蛛Pardosa laura为稻水象甲的主要天敌。【结论】稻水象甲在广东一年发生2个世代,主要于沼泽地中越冬,李氏禾和再生稻为其越冬期的主要过渡寄主,越冬地的主要天敌为沟渠豹蛛。这些发现对广东地区稻水象甲疫情精准防控具有理论指导意义。【Aim】To clarify the life cycle,overwintering habitats,occurrence regularity,host plant species and natural enemy species of the rice water weevil(Lissorhoptrus orvzophitus)in Guangdong province,South China,so as to provide scientific guidance for the prevention and control of this insect pest.【Methods】We investigated the life cycle and overwintering habitats of L.orvzophitus in Guangdong through field surveys,cage observation experiments and ovary dissection from March,2019 to April,2021,identified its overwintering transitional host plants through molecular detection of the midgut contents in adults,and detected its main natural enemies using sequence characterized amplified region(SCAR)marker technology.【Results】L.orvzophitus had two generations a year in the double cropping rice area of Guangdong province,and had overwintering and oversummering habits during March,2019 and April,2021.A complete generation of L.orvzophitus needed(140.86±1.05)d,and the larval duration was about 20 d in Guangdong.L.orvzophitus overwintered as adult in Guangdong province.The overwintering habitat pattern was paddy field,transitional zone(grassland),and swamp(abundant water grass).It was found that the ovary of L.orvzophitus adults during the overwintering period underwent diapause,and the ovarian grade was levelⅠ.Through molecular detection of the midgut contents in L.orvzophitus adults,it was found that during the overwintering period,the main transitional host plants of L.orvzophitus were regenerated rice(Oryza sativa)and Leersia hexandra,and the main natural enemy was Pardosa laura,a nomadic spider,as revealed by the result of SCAR-based PCR.【Conclusion】L.orvzophitus has two generations a year in Guangdong,and mainly overwinters in the swamp.The main transitional hosts during the overwintering period are Leersia hexandra and regenerated rice,and the main natural enemy in overwintering habits is P.laura.These findings have theoretical guiding significance for the accurate prevention and control of L.orvzophitu

关 键 词：稻水象甲 生活史 越冬 肠道内容物 寄主植物 

分 类 号：Q968[生物学—昆虫学]