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《Acta Ecologica Sinica》 2003-09
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Natural population life table of citrus spiny whitefly (Aleurocan-thus spiniferus) in tea garden

HAN BaoYu,CUI Lin Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China).  
Citrus spiny whitefly, Aleurocanthus spiniferus (Quaintance), usually damages tea, citrus, palm and other horticultural and ornamental plants. It has been found in Hawaii, Guam, Mauritius and East Africa, etc. It is also found in tea and citrus gardens in Japan and Indian. Being of apparent Asian origin, it is occasional a serious pest in Asia. Its larvae locate on the leaf back and suck the sap. Moreover, the larvae and adults excrete honeydew which induces the sooty moulds and retards the photosynthesis of plant. The pest outbreaks throughout the tea regions in Hainan Province, the Southern China, the middle and lower reaches of Changjiang River in the early 1960's, the early 1970's, the early 1980's, and from the end of 1980's to the beginning of 1990's, respectively. The mechanism of its outbreaking has not been understood clearly yet. In 1989, the pest was outbroken all over the tea growing areas in China. We selected a plot of tea garden in the Southern Anhui Province, which is usually infested by the whitefly, to investigate the pest population fluctuation, the relationship between the changes in population and weather factors, and the population density difference amongst the different habitats of tea garden and the tea varieties. Three generations of natural population life tables were monitored, and the effect of the various death factors on the population outbreak and breakdown had also been analyzed. In 2002, the pest occurred in light degree, and the same investigations were carried out. The results showed that the whitefly prefers shady and humid habitats, and mare than 80 % of population distributes within the middle and lower parts of tea bush. During the winter of 1988, the weather was warm and relatively dry, and the death rate was low. However, the accumulative basic number of population was higher. In spring of 1999, the weather was warm and moist which was favorable to pupation, eclosion and hatch. So the first generation was outbroken severely. The suppressing effect of the parasitic wasps on the pest population did not exhibit obviously until the pupal stage of the whitefly. Then, a lot of these adult wasps deposited their eggs into the larvae of the first and second instars from the second generation. Several species of entomogenous fungi resulted in the epizootic in the third instar larvae of this generation. The population trend index of the first, second and third generation was estimated at 047, 009 and 002, respectively. A. spiniferus population decreased sharply from generation to generation, and finally collapsed in the late August. Over 10 species of parasitic wasps and 4 species of entomogenous fungi were jointly responsible for dynamics of the pest population. The dominant natural enemies were Prospaltella smithi, Amitus hesperidum, Pleurodesmospora coccora, Cladosporium sp., Acremonium sp. and Aegerita webberi.
【Fund】: 中国农业科学院首批杰出人才科研基金资助项目([2002]382号);; 国家科技攻关资助项目(2001BA502B02)~~
【CateGory Index】: S435.711
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