一箱箱鲜梨在常温下存放贮运中,往往不久便腐烂了！起初,果皮表面出现水清状、褐色、圆形小斑点;扩大后,呈暗红褐色,有明显的同心环纹圈。病斑发展很快,几天内,全果腐烂,且有酸臭味。这是由一种属于子囊菌纲的真菌为害,叫轮纹病。每年春季,当气温上升到15℃左右,降雨量10毫米以上时。在 A box of fresh pears stored at room temperature storage, often decay soon! At first, the peel surface appeared clear water, brown, small round spots; expanded, dark reddish-brown, with obvious concentric rings. Rapid development of lesions, a few days, the whole fruit decay, and sour smell. This is caused by a fungus belonging to the genus Ascomycetes, called a rotavirus. Every spring, when the temperature rises to about 15 ℃, rainfall above 10 mm. in