Synthetic Cure And Management Of Lsa Sordida Nits Of Main Virescence Wood Species In Harbin

Valsa sordida Nit,the serious cosmopolitan disease, the incidence of which is 30-40% in shelter-forest, and the mortality is 10-20%, is severer in Northeast of China. With the environment worsening and other biological effect in these years, the incidence of this disease is up to 40%.In order to control and decrease the spread of this disease, according to the request of modern plant pathology. Using advanced research instruments, the technique of integrative management was studied.According to the investigation of all, the pathogenic bacteria is Valsa sordida Nit, and the asexual type is Ctyospora chrysosperma .The math model of prediction is Y=13.95+0.210Xi-0.821X2+0.003X3+0.894X4-8.675X5-0.149X6. It can predict the disease index of later 30 days on the basis of some meteorologic data, for example temperature, humidity, rainfall etc. In city garden, whose main function is purifying the air and beautifying the environment, the loss of volume of timber is not too important. We think biological means should be advocated during the preventing and curing plant diseases and insect pests. In this thesis, we put forward using trichoderma to prevent and cure this diseases, the trichoderma strains T168 and T-169 have applicable potential. After the indoor selecting and the outdoor experiment, we obtain three kinds of medicaments from ten:KESADE,JIAJILIUJUNLING and SHUANGXIAOLING, which are effective .The Populus freezing disease is important to this disease. And the Populus freezing diseases often occur during from the last ten-day of March to the first ten days of April, lessen during the first ten days of June, disappear during from the last ten-day of June to the first ten days of September, heighten during from the last ten-day of September to the first ten days of November, and level off after the last ten-day of November. We think the proper fertilization of N,K,P can widen the diameter of plant, heighten the height of plant and improve the hardiness of freezing, but the excessive fertilization of N can influence the woodiness and reduce the the hardiness of freezing. Bactericide adding the mucilage glue can get best effect: it can keep humidity ,on the other hand enhancing the temperature. The second is bactericide adding high fat membrane, and using bactericide or scrawling white alone is not too good. So we should on the basis of prediction and index, considering the fertilization , trying to conserve the trees and doing some chemical cure , implement integrative management.In this paper, we think in city green project this disease should take integrative management, 7which can provide worthy related technique and theoretical basis.