| Mingguang is located in eastern of Anhui Province. The drought or waterlogging often happen in past. In recent years, government regulates the structure of agricultural production, in order to increase the efficiency of agriculture and the peasants'income, by enlarging the area of vegetable, especially greenhouse vegetables. Then the population and species of pests of vegetable increased with the area of vegetables. This thesis screened the species of insect pests of tomato, pepper and eggplants, and found that most of all main 18 species of insect pests are three speices, Bemisia tabaci (Gennadius), Henosepilachna vigintioctopunctata (Fabricius) and Spodoptera litura (Fabricius), then the thesis investigated the rule of occur of these three species and carried out the control experiments with several insecticides in Mingguang.The whitefly in Minggguan area includes two species, one is Bemisia tabaci(Gennadius) and another one is Trialeurodes vaprorariorum (Westwood)。The adult initiated emerged at July and the most population occurred in the end of August, the second high population occurred in begin of September. The adult disappeared from field before end of October because of low temperature. Whitefly reproduced in greenhouse after the field was covered with film. The methods of control whitefly included quarantine, preserve natural enemies, trapping with yellow pad, besides reasonable use chemical insecticides. The efficient and low toxicity insecticides should be chose when white occurred randomly. Avermectins, imidacloprid,buprofezin are effective in controlling the whitefly and the more than 90% whitefly died at seventh day after treatment.There were four generations of Henosepilachna vigintioctopunctata (Fabrcius) occurred in Mingguang area each year, the stages of different generations overlapped clearly. The mortality was very high during winter although most adults got together in shelter and exposure southern places. The population of adults began to increase in begin and mid of April, most of larvae hatched in mid of May. The serious damage occurred during times from end of May to begin of June, from end of June to begin of July, from end of July to begin of August and from mid to end of August, correspondent to 1st,2n,3rd and 4th generation larvae. The sowing period should be swift from the four serious damage periods. When chemical control was needed, the spraying could be carried out during period from most adults emerged to the time most larvae hatched. The 3.5% Mirador EC is available insecticide to adult or larva with high efficiency in knockdown and persistence. The 5% Fipronil SC also is available to larva except the knockdown efficiency is not good. On the other hand, the 40% Phoxim EC is not efficient to H. vigintioctopunctata.Spodoptera litura Fabriciu migrated into Mingguang area in mid to end of June. The key period to controll the pest is from July to September. The CaiErSuSha and WeiKeDa No2 could be widespread because of high efficiency in controlling the S. litura. ChongWen No.1 is a kind of bioinsecticide which is persistent and nonpolluting and harmless to human being but kill pest slowly. The strategy of picking egg mass and leaves with neonate larvae could be used to decrease the population. The time spraying insecticides should be carried when larvae are young, and one insecticide should not be used long time lest the population develop high resistance to the insecticide. |
