Abstract
A virus disease occurring in red clover and pea at the Viik Experimental Farm was found by means of plant inoculation tests to be caused by the pea mosaic virus. Infected plants grew slowly and overwintered poorly. There were variations in the frequency of the diseased plants in different red clover varieties.
Highlights
In the summer of 1960at the Viik Experimental Farm, symptoms were observed in red clover which suggested the presence of virus diseases
The bean yellow mosaic virus, white clover mosaic virus, alsike clover mosaic virus, lupine mosaic virus and alfalfa mosaic virus cause the same kind of symptoms in red clover as does the pea mosaic virus
The virus found at Viik caused no symptoms at all in the bean and in soybean, while in Chenopodium quinoa localized necrosis appeared (Table 1)
Summary
The occurrence of virus diseases on red clover and their causal agents in Finland have only in recent years been investigated. Tapio [15] has published the first reports on the appearance of pea mosaic and bean yellow mosaic virus in red clover. In the summer of 1960at the Viik Experimental Farm, symptoms were observed in red clover which suggested the presence of virus diseases. The occurrence of the virus was investigated at the Muddusniemi Experimental Farm in Lapland (69°5' N) The symptoms of this disease varied greatly in red clover (Fig. 1). A yellow colour appeared often in the form of small spots which were elongated and parallel to the leaf veins. In the leaves of the pea plants, localized chlorosis appeared which was clearly distinct from the dark green surrounding colour (Fig. 2). The growth of the plant did not appear to be hindered by the disease
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