南方锦天牛成虫取食与产卵寄主选择性研究

Study on host selection for feeding and oviposition of Acalolepta speciosa adult

南方锦天牛Acalolepta speciosa是近年在油茶Camellia oleifera上新出现的一种蛀干害虫。为摸清南方锦天牛对不同寄主的取食和产卵选择行为,采用林间调查和室内观测的方法,记录害虫在不同寄主上的取食面积和产卵量。林间调查发现,广宁红花油茶C.semiserrat上未发现南方锦天牛危害状;南方锦天牛在距离地面72.0 cm以下、胸径大于1.0 cm以上的高州油茶C.gauchowensis、普通油茶C.oleifera树干上产卵,在叶片上不产卵;成虫产卵量与高州油茶、普通油茶寄主种类、树干胸径大小无相关性。室内试验表明,南方锦天牛成虫在木荷Schima superb、橡树Quercus palustris、马尾松Pinus massoniana和葡萄Vitis vinifera上既不取食也不产卵;取食山茶科Theaceae的山茶Camellia japonica和油茶的树皮和叶片,取食选择性无显著差异;成虫在油茶树干上产卵,在山茶树干上不产卵,产卵选择性无显著差异。

Acalolepta speciosa is a newly observed stem-borer on Camellia trees in Guangdong Province of China.In order to find out the host selection behavior of feeding and oviposition of adult on different hosts,the feeding area and oviposition number of the pest on hosts were observed and recorded in the field and the laboratory.Field research found that there weren t damaged symptoms in C.semiserrata;the adult didn t lay egg on the leaves,laid eggs under the trunk epidermis of C.gauchowensis and C.oleifera,the diameter of damaged trunk was more than 1.0 cm,the oviposition was less than 72.0 cm;there was no correlation between the number of eggs laid and the host species and trunk diameter.In the laboratory,the adult neither feed nor lay eggs on Schima superba,Quercus palustris,Pinus massoniana and Vitis vinifera,feed on barks and leaves of Camellia tree,laid eggs under the barks of C.semiserrata,C.gauchowensis and C.oleifera,but not C.japonica,there was no significant difference in feeding and oviposition selectivity among different hosts.