杨树溃疡病及其防治技术的研究

Studies on the Techniques of Controlling Poplar Canker Disease

杨树溃疡病的典型症状是产生水泡斑,当病斑包围树干时,上部即枯死。通过病组织切片及接种试验,说明该病的病原菌为Dothiorella gregaria Sacc,溃疡病4月初开始发生,4月末至5月中旬为发病盛期,6月中下旬基本停止。9月上中旬出现第二次发病高峰。1987～1989年防治总面积为1.3万亩,用11371、腐必清、不脱酚洗触、福美砷、而碱水涂抹病斑和用福美砷、多菌灵喷雾,均获较好的防治效果。

The poplar canker is a perilous disease which infected almost 300.000 mu of poplar plantation in Liaoning Province. Its typical symptom is the beister-like spots on the bark. If the spots surround the stem. The upper part will die. According to the observation of diseased tissue and the tests of inoculation it has been verified that the causeal organism is Dothior- ella gregaria Sacc. In Liaoning Provine this disease occured in the begin- ning of April and reacted to its peak from the and of April to the later part of May, and gererally stopped in the later part of June; otherwise, there was a second peak in the earlier part of September. From 1987to 1989,the total curing area of the disease had reached to 11000mu. Smearing of 11371,Tubiging, non-phenol free washing oil was confirmed to be eff- ective in controlling this disease, and so was spraying of Asomate and Bavistim Solution.