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1961—1962年,我们先后在河南省睢(木巳)林場和吉林省洮安县机械林場,对杨树烂皮病病菌生物学特性及寄主抗病性方面作了调查试验。 1.生物学特性:杨树烂皮病的有性世代系Valsa sordida Nits.,其有性时期形成的条件,目前尚未掌握。有人认为子囊壳的形成需要经过低温阶段。但在洮安地区,子囊壳能在当年新发病株上于7、8月份形成,不需要经过低温阶段。据洮安县气象站气象资料记载,在当地6—8月具有气温高、湿度大、雨量多的特点,如1962年6、7、8三月降雨量占全年总降雨量的87.3％;平均气温
From 1961 to 1962, we conducted a survey on the biological characteristics and host disease resistance of P. yunnanensis, a species of poplar in Guizhou Province, and the mechanical forest farm in Qiong County, Jilin Province. 1. Biological characteristics: Poplar rot disease of the sex family Valsa sordida Nits., Its sexual conditions formed, has not yet mastered. Some people think that the formation of ascus shell needs to pass the low temperature stage. However, in the area of 洮An, the capsulotus shell can form in July and August in the newly-occurring diseased plants of that year, without going through the low temperature stage. According to the meteorological data of Qian’an County Meteorological Station, it has the characteristics of high temperature, high humidity and heavy rainfall in the local June-August. For example, the rainfall in June, July and August of the year of 1962 accounted for 87.3% of the total annual rainfall; the average Temperature