| Plant, plant-eating insect, and its natural enemy react upon each other, and evolve harmoniously in the nutrition system where the change of chemical substances plays a vital role. In this article, the author clarifies the relationships between plant, plant-eating insect, and its enemy from three aspects—the change of chemical substances in cotton leaf after it's being harmed, taxis analysis of insect and mite to animo acid, sugar and cotton allelochemicals and the function response of natural enemy dealing with cotton mite. Theresults are as follows:1. The index number of physiologic and biological chemistry testedThe contents of chlorophyll, protein, soluble sugar , ascorbic acid , and the activity of phenylalanine ammonia lyase, catalase, peroxidase and superoxide dismutase have changed differently in cotton leaves after cotton plant have being harmed in different degree by Tetranychus turkestani Ugarov & Nikolski during 0~ 8 days2. Taxis analysis of cotton mite and three kinds of natural enemy to amino acids, sugars, and cotton allelochemicalsInsects recognize the food itself firstly before they select and eat. Plant may provide the necessary nutrition for insect and mite, including sugars, protein amino acids, fat, vitamin and etc. It is drawn conclusion by test that cotton mite, Stethorus punctillum, Orius niger, Hippodamia variegate response to taxis obviously with some chemical substances, such as L-alanine, D-trehalose.3. The predacious function responseIn this experiment, environmental temperature is designed as four grades that is 20℃, 24℃, 28℃, 32℃. Holling Ⅱ is used to fit the formula of functional response of three natural enemies on Tetranychus turkestani Ugarov et Nikolski based on the data from experiment. The results suppose that Holling II is better fitting the functional response of these three natural enemies on Tetranychus turkestani Ugarov & Nikolski(larva, adult).The temperature can affect the parameter of the functional response, but do not change the category of the formula.4. The prospect of the applicationCotton mite is the main pest in Xinjiang's cotton field, and the damage from it has seriously restrained the yield and quality of cotton in Xinjiang.Three nutrition relationships between plant and plant-eating insect and natural enemy are focused in some years. New strategies of pest control are expected to put forward. |
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