Study On Kinds Of Egg Parasitoids Of Sugarcane Borers In GuangXi Province And Application Of Trichogramma Chilonis

Sugarcane is the most important sugar and commercial crop,GuangXi Province is one of the largest planting areas of China,account for more than sixty percent of China. Sugarcane moth borer is the major pests of the growth progress of sugarcane, Proceras venosatus ?Walker? and Chilo infuscatellus Snellen are the heaviest in all sugarcane borers.There are multiple ways of prevention and control. But biological control has been got more and more attention. This paper mainly investigates egg parasitoids of Chilo infuscatellus Snellen and Chilo sacchariphagus,then carries out a field survey identification?makes some resistant determinations in the laboratory and application.Therefore, this thesis gets the following result:1.Kinds of egg parasitoidsThe main egg parasitoids in the planting areas in GuangXi Province are:Telenomus spp?Trichogramma,then Trichogrammaconcludes Trichogramma chilonis and Trichogramma ostriniae.2. the biological property and antireversion force ofTrichogrammaThe adaptation of the intermediate host about Trichogramma:not only from the amount of parasitic,but also the amount of Trichogramma and longevity all can get the result, Trichogrammachilonis is better,the amount of parasitism is larger,and they have long life-span.The research about the sensitive reflect of temperature of Trichogramma,under the condition which has the most appropriate temperature and humidity ?the temperature is 26?, the humidity is seventy-five percent?, the amount of parasitic and Trichogramma is the best, the longevity of the Trichogramma will become longer along with the decreasing of the temperature,but between the temperate of 26 and 18,the amount of parasitic will decrease along with the decreasing of temperature,but the elosion rate will decrease along with the decreasing of temperate;the rate of female and male will increase along with the decreasing of temperature,and the range of change about Trichogrammachilonis is large than Trichogramma ostriniae. So Trichogramma ostriniae is more sensitive.The four stages of Trichogramma'response of pesticide is:thesensitive of pesticide in its prepare pupae and pupae ismoresensitivethan egg and larvae. To the Trichogramma adults, the most toxic of Trichogramma is bisultap in the four kinds of pesticide which are chosen, thenumerical value is greater than 7.98x10^-6mg/cm².The second one is imidacloprid, the third one is abamectin andchlorantraniliprole is the last one.3. Study on the application result of TrichogrammaReleasing Trichogramma in the field can improve parasitism rate egg parasitoids in the early growth stage of growth of sugarcane?seedling stage and tillering stage?,decreases borers pest rate in the maturation stage and increases productions and valid stems of sugarcane,however,it doesn't have obvious advantage on control the rate of withered interior leaf in production.