Studies on virus diseases of azuki bean (Vigna angularis Wight) in Japan.
1990
Iizuka N.
The prevalence of virus disease in azuki bean plants in the fields of Iwate Prefecture were investigated. The major source of primary inoculum appeared to be infected seed with azuki bean mosaic virus (AzMV). Secondary infected plants appeared in early-July; with increase in aphid population, diseased plants increased rapidly and 100% showed symptoms during mid- or late-July. In the most prevalent period, the disease developed in 40-50% of the plants only for a week in late-July. About 60% of the diseased plants showed mild mottling with vein-banding on the leaves, 30% appeared mosaic mottling with vein-banding, and 10% showed stunting with mosaic mottling, distortion and/or crinkle on the leaves. AzMV was isolated from all diseased plants, and half of them showing mosaic mottling and those with severe symptoms were doubly infected with both AzMV and cucumber mosaic virus (CMV). All plants in the field were infected by AzMV before late-July or early-August. The occurrence of CMV was later than AzMV; 10% of the plants were infected with the virus by mid-July and 40%, infected by early-September. Almost all plants in southern areas in Iwate prefecture were doubly infected with AzMV and CMV and showed severe symptoms. Many plant showed mild symptoms, being singly infected with AzMV, alfalfa mosaic virus (AMV), bean common mosaic virus (BCMV) or bean yellow mosaic virus (BYMV) in the northern areas of the Prefecture.
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