棉花轮纹斑病是一种真菌病害,属半知菌类。通常发病并不普遍,为害也较轻。但去年我县主要棉区却普遍发生,危害严重,并造成落叶、落蕾、落花、落铃,其损失并不亚于红蜘蛛和三大蛀虫。对此,我们曾进 Rana leaf spot is a fungal disease, is a semi-known fungi. Usually the incidence is not common, damage is less. Last year, however, the major cotton areas in our county were widespread and endangered. They also caused deciduous leaves, falling buds, falling flowers and falling bells. The loss was as much as that of the red spiders and the three large borers. In this regard, we have entered