荔枝粗胫翠尺蛾的鉴定及生物学特性研究

通过对危害广东地区荔枝龙眼尺蛾的田间调查和鉴定,发现原来报道的绿额翠尺蛾[Pelagodes proquadraria(Inoue)]属种类鉴定错误,其种类应为粗胫翠尺蛾(Thalassodes immissaria Walker)。对粗胫翠尺蛾生物学特性和发生规律研究的结果表明,其幼虫分5龄,符合Dyer生长规律;成虫存在性二型现象,雌蛾触角丝状,雄蛾触角羽状;该虫主要以幼虫危害荔枝和龙眼的嫩梢嫩叶,在广东地区1 a发生7~8代,幼虫老熟后吐丝缀连相邻的叶片成苞状,并在其中化蛹;卵散产,以嫩叶叶尖和叶缘落卵最多;在室内26℃恒温饲养,卵和蛹的发育历期分别为3.64和6.67 d,1~5龄幼虫发育历期分别为2.76、2.80、3.42、3.89和5.16 d,成虫产卵前期为1.63 d。

Identification and biological characteristics of Thalassodes immissaria,an emerald moth infesting litchi

The species of emerald moth that infested litchi and longan was identified as Thalassodes immissaria(Walker) not as identified as Pelagodes proquadraria(Inoue) before by field survey and analysis of male genitalia.The biological charac-teristics and occurrence pattern of T.immissaria were studied.The larva of T.immissaria can be divided into 5 instars based on Dyar’s law.Adults showed sexual dimorphism,which the antenna of female moth was filiform and that of male moth was plumose.T.immissaria made damage to litchi and longan young leaves and twigs by larvae and occurred 7 to 8 generations a year in Guangdong province.The full-grown larva spun silk to combine the leaves around itself and turned into pupa in the combination.Eggs were laid singly in finial and edge of young leaves.Under the laboratory condition,the developmental du-ration of egg,pupa,1st to 5th instar larva and pre-oviposition was 3.64,6.67,2.76,2.80,3.42,3.89,5.16,and 1.63 d respec-tively at 26 ℃.