| Vegetable is indispensable in everyday and it plays an important role in the development of agriculture. With china's opening up, people's living standard is constantly raised. Vegetable plant diseases and insect pests occur seriously with enlarging constantly the vegetable cultivated area. So effective control of vegetable plant diseases and insect pests has become central in production of vegetable. The Master's dissertation analyses systematically present situation of non-polluted management of vegetable plant diseases and insect pests at home and abroad. Based on forefathers' research achievements, biology control is the direction of the controlling vegetable insects pests in future. Considering the present situation of study and integrated pest management, Kinds of vegetable insect pests and occurrence law and bionomics of the dominant species were investigated systematically in Yinchuan area and some biological insecticides were chosen to carry out the test. Result is as follows.(1) More than 30 kinds of vegetable were systematically investigated in Yinchuan area from 2002 to 2004. Consequently, there were 67 species of vegetable insect pests belonged to three classes, Insecta, Arachinidea, Gastropoda and 22 families. The predominant species were vegetable moth Plutella xylostella L. and cabbage white Pieris rapae L. which do harm greatly to the local vegetable.(2) The occurrence laws of vegetable moth and cabbage caterpillar were investigated in Yinchuan area of Ningxia. Result shows that vegetable moth occurred 3-4 generations one year, which prevailed on 4 generations in Yinchuan area. It over-wintered with the pupa in fallen leaves or the weeds of ground. Over-wintered adult appeared in the middle May, and larva of the first generation harmed wild weeds in middle-late May and then expanded on the cabbage. Vegetable moth breaks in June, July and August. The cabbageCaterpillar occurred mostly 3 generations a year, and only a few individuals can survived the fourth generation, which overwintered with the pupa in withered leaves, wall and hedge. Over-wintered adult emerged in the early May, but population is few, and then break in the early-middle June. It harmed seriously from the late June to August and population reduced clearly in the late September, and then overwintered in the middle of October.(3) There were 5 kinds of insecticide (Acephate, Avern, Propetamphos, Matrin, beta-cypermethrin) to be used to control the vegetable insect pests. Indoor effect of the insecticides shows the effeciency of acephate is more than that of other any insecticide. But the effect of Matrin is notably lower than that of other any insecticide. The effeciency of 5 kinds of insecticide to the cabbage caterpillar shows the effeciency of Matrin is clearly lower than that of others on 1st day, 3rd day and 5th day after spraying insecticide. There is no notable difference after spraying other 4 kinds of insecticide. After 3 days there is 100% in effeciency of acephate and beta-cypermethrin. The effect of Avern and propetamphos reaches 90%. Matrin is up to 60% after 5 days. Other 4 kinds all have been up to 100%.The field effect of insecticide shows beta-cypermethrin has most effective after 1 day, but only 39.4%. After 3 days acephate and Avern increase, up to 72.2% and 70.2%. The effeciency of acephate reaches 94.5% after 5 days, and clearly more than other 4 kinds of insecticide. Propetamphos is up to 92.4% after 7 days. So acephate and propetamphos is more effective to cabbage caterpillar.
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