Preliminary observation on the morphological characteristics and biological characteristics of the tea leaf pest Thosea sinensis
With global warming,tea plantation pest Thosea sinensis broke out again in some areas.In order to effectively improve the level of field identification and prediction,a preliminary observation of the morphological characteristics and biological characteristics of T.sinensis at different developmental stages was carried out.The results showed that the eggs of T.sinensis were flat and oval in shape,and the egg shell had a reticulated streak structure.The egg length was 2.41 mm and the egg width was 1.77 mm.The larvae had three pairs of thoracic feet and no gastropods.The abdomen showed wavy peristalsis when moving.The body weight of mature larvae(one day before cocooning)was 542.35 mg,the body length and width were 21.76 mm and 13.30 mm,respectively.Mature larvae pupate in the cocoon after cocooning,and the cocoon length and width of female cocoon were larger than those of the male cocoon.For pupae,the body color changed from milky yellow to yellow-white,brown and gray-black,and the compound eyes changed from milky yellow to red and black.The weight of female pupae 446.95 mg was significantly higher than that of male pupae 363.32 mg.The body color of adult was gray-brown,with a brown transverse band near 2/3 of the forewings.The body length of females 15.23 mm was significantly longer than that of males 13.55 mm.There were 2～3 generations of T.sinensis in Jiangxi area in one year,and the incidence rate of the third generation was only 1.37％.The parasitism rate of this insect in the wild was 4.66％.
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万方数据
