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根癌病是一种世界性病害,寄主有59科300多种。主要危害果树,也发生在毛白杨、加杨、大青杨的幼树上,是毛白杨苗期的主要病害之一,为检疫对象。近年来,由于检疫制度不健全,随便由外地引进种苗,使该病迅速蔓延,严重影响毛白杨苗木的产量和质量,给发展毛白杨带来了障碍。为了控制和消灭此病害,1979年以来我们对毛白杨苗期根癌病的发生情况,危害程度,发生规律和防治,进行了调查、试验。现将结果整理如下。
Root cancer is a worldwide disease that hosts more than 300 families of 59 families. The main damage to fruit trees, also occurred in poplar, Canada poplar, Populus sapling young poplar is one of the major diseases, quarantine objects. In recent years, due to the imperfect quarantine system, the introduction of seedlings at any place has rapidly spread the disease and severely affected the yield and quality of Populus tomentosa seedlings, which brought obstacles to the development of Populus tomentosa. In order to control and eradicate this disease, we investigated and tested the occurrence, harm, occurrence and control of root-knot disease in Populus tomentosa seedlings since 1979. The results are now organized as follows.