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梨黑星病是危害梨树的主要病害之一,尤以鸭梨发病最重,雪花梨在近成熟期也严重染病,几天之内即可引起大量落叶落果。病菌主要以菌丝体在受感染的梨芽内越冬,翌年春天,病芽萌发长出的新梢和花序基部长有灰黑色的霉层,它是最重要的初侵染源。病害在其周围形成一个明显的发病中心,逐步向四周扩展,侵染梨树所有的绿色幼嫩组织,且再侵染次数较多。一、铲除病源。冬剪时剪掉霉黑的病芽,发芽前彻底清扫果园落叶落果,病枝集中烧毁;芽萌动前,细致喷布3度石硫合剂;4月上旬到5月末,经常检查,发现病梢立即将其彻底剪除,
Pear scab is one of the main diseases that endanger the pear tree, especially the most serious pear disease, snowflake pear in the near maturity also seriously ill, within a few days can cause a large number of fallen leaves. The mycotoxins mostly winged in infected pear buds. The next spring, buds and inflorescence base buds grew out of gray-black mildew, which was the most important source of initial infection. The disease formed a significant center of disease around it and gradually expanded to all directions, infecting all the green young tissues of the pear tree with more re-infection. First, eradicate the source. Winter shears moldy black cut buds, germination orchard before the full cleaning of fallen leaves, diseased branches concentrated burned; bud sprouting before, fine spray 3 degrees lime sulfur mixture; early April to late May, regular checks and found that the tip Immediately cut it completely,