Adaptability Of Monolepta Hieroglyphica To The Cotton And Corn

Monolepta hieroglyphica(Motschulsky)(Coleoptera: Chrysomelidae)originally occurred in the northeast and Huang-Huai-Hai regions,and it appeared in Kuitun,Xinjiang in 1998.It began to injure cotton in 2001 and it has spread to northern Xinjiang in 2006.The cotton area became the main pest on Xinjiang cotton.The pest hosts a wide range of pests,which are important pests of crops such as corn,millet,and sorghum.Adults feed on the leaves,causing huge losses in cotton production.In this thesis,plant morphology and plant nutrition analysis were used to compare the differences in physicochemical properties and nutrient composition between the host plants of the M.hieroglyphica,and the effects of host plants on the growth and development of the M.hieroglyphica,using EAG and Y-type olfactometer compounds having electrophysiological and behavioral activity volatiles,Exploring the physicochemical properties of host plants and effects of plant nutrition on the M.hieroglyphica behavior and development,to provide a theoretical basis for exploring the adaptability of M.hieroglyphica to host plant.Defining the main volatile components of the host of the M.hieroglyphica..It provides a new way of thinking and technology to control the pest by using natural active substances.The main findings are as follows:1.Effects of host plants on the nutrient content and growth of M.hieroglyphica.The results showed that there was no significant difference in water content,nitrogen content,total protein and soluble total sugar in leaves of cotton and corn,but the content of total amino acids in cotton leaves was significantly higher than that in corn leaves;there was no significant difference in the gross hair number in various parts of corn leaves.The number of hairs in the middle part of the cotton leaves was significantly higher than that in other parts and was also significantly higher than that in the middle part of the corn leaves.The contents of triglyceride and total protein in the leaves of the M.hieroglyphica were significantly higher than those in the corn.The content of total amino acids in leaves and corn leaves was significantly higher than that in cotton leaves.The total soluble sugar content in males was significantly higher than that in cotton leaves,but there was no significant difference in females.After feeding cotton and corn leaves,they were doubled.The relative longevity and spawning rate of adult male and female larvae were higher than that of corn.2.Electrophysiological responses of the M.hieroglyphica to 10 volatiles of cotton and corn.The results showed that the response of M.hieroglyphica male to Tricyclo,Dragosantol,?-Pinene,Myrcene,3-Carene,1,3-Butadiene,Palmitic acid were relatively obvious.The response of M.hieroglyphica female to10 kinds of volatile with part concentration were relatively obvious.The response of M.hieroglyphica males to 3-Carene is the most sensitive,the response of M.hieroglyphica females to Dragosantol is the most sensitive.3.The olfactory behavior responses of the M.hieroglyphica to volatiles of cotton and corn.The results showed that Dragosantol and ?-pinene had obvious attractive effects on the male and female adults of M.hieroglyphica,and the formula 1,2 and 6 had obvious attractive effects on the male adults of M.hieroglyphica.The formula 2,6 had obvious attractive effects on the female adults of M.hieroglyphica.In conclusion,(1)The total amino acid content in cotton leaves is higher than that in corn leaves,and there is no difference in other nutrients,indicating that the content of amino acids may be one of the factors affecting the preference of the insects on the host's feeding preference;The number of hairs in the middle of the leaves was significantly more than other sites,indicating that the more the number of hairs in the leaves,the more the feeding activity of the leaf a.(2)The longevity and fecundity of adults of M.hieroglyphica,which were feed on cotton,were significantly higher than those of corn,and were more favorable to the growth and development of the M.hieroglyphica.It indicates that cotton is a more suitable host plant of these two hosts for the leafhopper.(3)Dragosanto and ?-pinene have obvious attracting tactics to the M.hieroglyphica,which can be used as the attractant ingredient of the M.hieroglyphica.