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雪花梨是我省的优质土特产品之一,历来的文献中一直将其列为抗梨黑星病的代表品种。但是近年来,在雪花梨的主产区(如赵县,宁晋县等地)发现其也感染黑星病。特别是近两年由于该病发生日趋严重,面积越来越大,而且套用鸭梨黑星病的防治方法效果不佳;尤其果农反映应用多菌灵农药防效很差,成了生产上的重要病害。如赵县1986和1987两年损失雪梨2千万斤,宁晋高庄合村1987年就损失40万斤。结合生产实际,1988年我们对该病进行了观察和试验。据在宁晋高庄合村观察,前期5月初的最初发病部位仍为病芽梢。症状与鸭梨黑星病病芽稍基本相同,而此时叶片未被感病。另据,曾收集高庄合等地的越冬雪梨病叶,保湿培养未有子囊壳产生:田间设涂凡士林的载玻片未捕捉到子束孢子:重病园的鳞片收集检查也未有新分生孢子产生。由此可以
Snow pear is one of the province’s high-quality native products, the literature has always been listed as anti-pear scab representative varieties. However, in recent years, snow pear’s main producing areas (such as Zhao County, Ningjin County, etc.) found that they are also infected with scab. In particular, the past two years, the disease is becoming more serious, the area is getting bigger and bigger, and the application of pear pear scab control method ineffective; especially farmers reflect the application of carbendazim pesticide control effect is poor, has become a production Important disease. For example, Zhaoxian lost 20 million pounds of Sydney in 1986 and 1987, while Ningjin High Village lost 40 million pounds in 1987. Combined with the actual production, in 1988 we conducted the observation and test of the disease. According to Gao Zhuang village in Ningjin observation, early May early initial site of disease is still budding shoots. Symptoms and pear scab disease buds are basically the same, but this time the leaves have not been susceptible. In addition, it has been collected Gaozhuang and other places of winter snow Sydney leaves, moist culture did not produce ascus: field coating Vaseline slides do not capture the beam bundle spores: seriously ill park scales collection inspection also no new points Spore production. This can be