Changes In Populations Of Cotton Bollworm And Light Trapping Techniques Research

(1)In this paper, the second chapter, we Shihezi northern region of the cotton field, three generations of cotton bollworm natural population life table for a study and discussion, with a view to explore a northern Xinjiang cotton bollworm populations of the developmental stages the survival rate and the impact of the demise of Main reason, the second generation of cotton bollworm age of 3, 4 TSE is the key pest period, the cotton fields of large predatory enemies occurred, 6 TSE is also critical pest period, the period in 2007 a lot of rainfall, low temperature, air humidity, Not conducive to the development of bollworm larvae growth, while large number of parasitic natural enemies also occurred. Bollworm period of three generations of the young, eggs to a TSE this time period is the key pest, the cotton fields of large predatory enemies occurred at the same time period a lot of rainfall, the lower the temperature is not conducive to the growth of bollworm larvae.In the second generation of cotton bollworm in the younger age period, the impact of its population is the main predator rate. This is a predatory enemies more than the time. Bollworm young and susceptible to predation period. By the age of 5-6, parasitic natural enemies of the bollworm emergence of a large number of parasitic rates begin to rise gradually, to age 6 parasitic rate reached a peak.Three generations of bollworm larvae in a younger age, factors in the Predator was significantly increased, but also large predatory enemies in the period. Tsaoling, floating insects, spiders, carnivorous bug, such as predatory enemies in the cotton fields of the population has always been larger, before the age of 3 larvae control significant role. This is the natural enemies of cotton field-harm stronger role in the period. In late July is the time.(2)The main natural enemies of cotton bollworm and Ladybug grass Chrysopa septempunctata bollworm population dynamics that affect the major natural factors, in Xinjiang's cotton production plays an important role in this paper[1], the third chapter, the detailed study of the Shihezi in major predatory enemies more dominant species Ladybug varies and the general grass Chrysopa septempunctata and bollworm eggs and larvae growth and decline, and the two main enemies of the bollworm predation were compared:Overall, the dominant species of predatory enemies of the bollworm predation of eggs, and more predation of the adult ladybug varies significantly more than the general adult predator of grass Chrysopa septempunctata, the regression equation test for significant differences. Natural enemies of the bollworm larvae feed on the eggs of the relationship is this: many different Ladybug larvae and larvae of a common grass Chrysopa septempunctata, the test for the difference is not significant.The natural enemies of the dominant species of bollworm larvae feed on volume, more adult ladybug varies Predator was also larger than ordinary grass Chrysopa septempunctata adult predator; regression equation test differences are significant. And the same for the bollworm larvae, the easier it is the smaller the number of age were arrested by feeding predators feeding.Shihezi in the region, ladybug control of bollworm in the role of grass Chrysopa septempunctata than a more obvious bollworm control, more effective. Ladybug large number of artificial feeding to combat the outbreak of bollworm play an important role. (3)In the fourth chapter of this paper, the current market has been the main lure insects with several were introduced and analysis, discussed their respective advantages and disadvantages, on the basis of this principle associated with the multi-purpose lure insects for research . Through a series of experiments on the multi-purpose lure insects with the performance and effectiveness lure insects were discussed. - Set lure insects with a variety of tools lure insects on the advantages of a fully played an energy-saving, water saving, the economy, the role of the province, through the experimental field testing, preliminary results prove that lure insects relatively significant.