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RHIZOCTONIA DISEASES IN SUMMER

机译：夏季根瘤病

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Every disease has at least one season that favors its development. For Rhizoctonia it's the summer. This fungus usually prefers the heat, humidity and rainfall that occur in many parts of the United States during the summer. In the southeastern U.S. it can also be found in spring and fall when the environment is still favorable for its development. There are several types of Rhizoctonia that attack ornamentals and they have very little host specialization, meaning one can attack many types of plants.Rhizoctonia solani is the most commonly found and tends to have a very broad host range. In contrast, binucleate (two nuclei per cell) pathogens are most common on woody ornamentals with aerial blight in the southeastern U.S. Still other types of Rhizoctonia attack turf grass but they are hot often found on ornamentals. The same R. solani isolate that can cause leaf spot on aglaonema can cause cutting rot on poinsettia and damping-off on celosia.
机译：每种疾病至少都有一个有利于其发展的季节。夏天是支气管炎。这种真菌通常喜欢夏天在美国许多地区出现的高温，潮湿和降雨。在美国东南部，也可以在春季和秋季发现该地区，但仍有利于其发展。侵染观赏植物的根瘤菌有几种类型，它们的寄主特化很少，这意味着它可以侵染多种类型的植物，茄根枯菌是最常见的寄主，寄主范围也很广。相比之下，在美国东南部的木本观赏植物中，双核生物病原体（每个细胞两个核）是最常见的，在空气中会枯萎。还有其他类型的根瘤菌会攻击草皮草，但在观赏植物上却很热。可以在glaonema上引起叶斑的相同的R. solani分离株可以引起一品红的腐烂和鸡冠花的衰减。

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