Study On Main Species Of Grasshoppers In West Of Heilongjiang Rangeland And Their Integrated Control

The paper studied grassland, dominant species of grasshoppers, harmful characteristics of dominant species and technique of integrated pest management in West of Heilongjiang Rangeland through investigation and large area contrast experiment. It determined common species, dominant species of grasshoppers, showed clearly harmful characteristics of dominant species, grass species and types of grassland in West of Heilongiiang Rangeland. Protective effect to mingle species groups was researched through Nosema Locustae, Metarrhizium and agricultural chemical way. According to the results means of IPM had been provided in West of Heilongjiang Rangeland.The results in 2005～2006 showed that prairie in West of Heilongjiang Rangeland was mesophytic pallet grassland; there were more than 103 kinds of grass; Aneurolepipium chinehse Kitag, mingle grass and Aneurolepipium chinehse Kitag grassland were main species among them. The natural grassland could be divided into 3 categories, 7 groups, 9 types of vegetation. There were 17 common species of grasshoppers that injured grassland in West of Heilongjiang Rangeland, of which there were 8 dominant species. These dominant species occurred differently in number and time according to separate vegetation. Oxya chinensis (Thunberg), Dasyhippus barbipes (F.-W.), Pararcyptera microptera meridionalis (Ikonn.) and Myrmeleotettix palpalis (Zub.) took place in earlier time. Oedaleus decorus asiaticus B.-Bienko, Br. tuberculatum dilutum (stoll), Epacromius coerulipes(Ivan.) and Ch. Albomarginatus(De Geer) took place in later time.Oxya chinensis (Thunberg), Dasyhippus barbipes (F.-W.) and Pararcyptera microptera meridional konn.) often occurred in straw mattress prairie which liked to eat Gramineae and Leguminosae grass. Epacromius coerulipes (Ivan.) liked to live in environment with moisture soil, alkaline land and sparse vegetation, which was main species on sea shore and lowland. Oedaleus decorus asiaticus B.-Bienko liked to live in wet lowland, ridge and little higher area which jeopardized Gramineae and Cyperaceae herbage etc, especially Clinelymus dahuvricus Nevski. There were Pararcyptera microptera meridionalis (Ikonn.) , Oedaleus decorus asiaticus B.-Bienko, Br. tuberculatum dilutum (stoll) and Myrmeleotettix palpalis (Zub.) in hilly drought grassland, Pararcyptera microptera meridionalis (Ikonn.) was dominant species among them.IPM should be applied to prevent and cure grasshoppers, Chemical control way was as important as biological method. The best prevention and cure time was before 3 stadium grasshoppers, and 13～20 hoppers/m~2 .when dense of species group was bigger chemical control way should be taken todecrease insect population. Opposite situation biological control method should be applied. At same time valuable natural enemy should be protected and utilized to change environment of habitat of hopper. Then the aim of prevention and cure grasshoppers would ultimately be realized.