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大约从1950年以来才被认识的马铃薯畸形花叶病(PDM),正在阿根廷大量传播,它在阿根廷的马铃薯主要产区所占的比重至少象马铃薯卷叶病毒和Y病毒一样重要。世界其它各地至今还不曾对此作过报道。其症状为大量不规则的褪绿斑,兼以叶部畸形。在老一些的植株上,可能发生一般褪绿和谈红的色变。如与X病毒混合侵染时即产生综合的症状;如与Y病毒共同侵染时,植株则显得矮小而细弱。初感染的植株,有些块茎发病,有些只是局部发病,但也有不发病的。发病与局部发病的块茎,邻近匍匐茎基部的芽眼比不发病的块茎好象还要健康。二次感染的植株,块茎偶而还可以出现一些不罹病的芽眼并能长出一些健康的植株。用机械方法或用三种蚜虫和叶螨传播病害的尝试都失败了。栽培品种的感病性是差异很大的,所以防治措施应以生产感染率低的那些种薯为目标。
Potentially degenerative mosaic disease (PDM), which has only been known since about 1950, is being widely spread in Argentina and its share of the main potato producing areas in Argentina is at least as important as the potato leafroll virus and the Y virus. The rest of the world has not reported on it so far. The symptoms of a large number of irregular chlorotic spots, both foliar deformities. On older plants, general chlorotic and reddish discoloration may occur. As with the X virus mixed infection that produces a comprehensive symptom; as co-infection with the Y virus, the plants appear to be short and thin. The first infected plants, some tuberous disease, some only local disease, but there are also non-onset. Occurring and locally occurring tubers, buds near the base of stolons seem to be healthier than uninjured tubers. Secondary infection of the plant, the tuber occasionally there may be some non-diseased bud eye and can grow some healthy plants. Attempts to spread the disease mechanically or with three kinds of aphids and spider mites have failed. The susceptibility of cultivars is very different, so control measures should target those that produce low rates of infection.