Studies On Biological And Ecological Characteristics And Parasitoid Natural Enemy Of Mansoniella Cinnamomi (Zheng Et Liu)

Mansoniella cinnamomi (Zheng et Liu) is a newly discovered pest on Cinnamomum camphora (L.) Presl.. In recent years, they have damaged successively in Hunan, Zhejiang, Shanghai, Anhui and other places. The occurrence and harm increasing potentially year by year in water conservation forest of Shanghai Huangpu River and urban road greening trees. The damaged leaves generally change to dark brown in color and a large number of leaves fall off. The whole tree leaves fall off while the trees are damaged seriously and produce dead branches when the weak trees are harmed seriously. It produce a serious threat to the healthy development of the water conservation forest in Shanghai. The present paper dealt with the life cycle, biological habits of Mansoniella cinnamomi (Zheng et Liu) and the differentiation of instars and morphological characteristics of their nymphs. With the method of using the head width frequency distribution and morphological characteristics of their nymphs, the result showed that the nymph of Mansoniella cinnamomi could be divided into five instars, and the head widths were0.23±0.03mm,0.34±0.02mm,0.47±0.03mm,0.57±0.02mm and0.68±0.03mm respectively. At the same time, it’s the first time to describe morphological characteristics of their nymphs in detail. The pests occur four generations per year, the eggs overwinter under the cortex in petiole, chief vein and the end of thin twig, and the generations are obviously overlapped. The occurrence calendars of each generation are determined and the life cycle table was provided. Observe and describe the habits of adult during the emergence, mating and oviposition, and also the activity, feeding and molting habits of nymphs in detail. And describe the life table of three generations and population dynamics in different generations. The optimum control period were established and methods for prevention and control of the pests were proposed providing the basic data for the prediction and control of the pests. A new species. Pterygogramma mansoniella sp. nov. an important parasitoid of eggs of M. cinnamomi was also found and described. All the type specimens are deposited in the insect collections of Northeast Forestry University.