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磷有机杀虫剂国际进展述评··“····“········“···,·············”··········“·…......
棉花轮纹斑病又称棉黑斑病 ,俗称腰折病 ,是一种种子带菌传播的侵染性真菌病害。沿江圩区棉花均能发生。一、发病症状病原侵染子叶......