一苹果锈果病和花脸病的研究观察1.苹果锈果病和花脸病系同一病原所致的病害。锈果病和花脸病这两种症状类型是一种病毒在不同种或品种寄主上的症状表现;在某些品种上往往显现锈果和花脸的复合症状。这是通过症状观察和交互嫁接试验证明的。一般地说,早熟品种表现花脸者较多,而晚熟品种表现锈果者较多。由于西洋苹果的晚熟品种较多,而中国苹果大都早熟.就使人们以为西洋苹果 An apple rust fruit and face disease research observation 1. Apple rust fruit and face disease caused by the same pathogen disease. The two types of symptoms, rust and masculine, are symptoms of a virus on hosts of different species or varieties; in some species the symptoms of rust and shaman are often found. This is demonstrated by symptom observations and cross-over grafting trials. In general, early maturing varieties show more face, while late-maturing varieties show more rust-fruit. As the Western varieties of late-maturing apples more, while most of the Chinese apple precocious make people think that Western Apple