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梨树叶子上有黄点
梨树的叶子上长有黄点,可能是感染了梨锈病。锈病主要是危害梨树的幼嫩绿色部分,比如幼叶、叶柄、幼果、新梢等位置。为了防治梨锈病,提前将梨树周边的桧柏、龙柏等转主寄主去除掉,如果不能去掉,可以喷布4-5波美度石硫合剂。如果发现已经染病了,可以喷20%粉锈 ...
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