Arabis mosaic

Damage. This virus infects a wide range of horticultural crops. On strawberries, yellow spots or mottling are produced on the leaves, and certain cultivars become severely stunted. On ornamental plants, e.g. Daphne odorata, yellow rings and lines are seen on infected leaves, and the plants may slowly die back, particularly when this virus is associated with cucumber mosaic inside the plant.

Life cycle. Several weeds, e.g. chickweed and grass spp., may harbour this disease, and in strawberries severe attacks of the disease may occur when planted into ploughed-up grassland. The virus is spread by a common soil-inhabiting nematode, Xiphinema diversicaudatum, which may retain the virus in its body for several months.

Control. Control of this disease can be achieved by preventative methods. Certified virus-free soft fruit planting material is

Reversion Virus Blackcuirrant

Figure 15.21 Reversion disease of blackcurrant. Note that the infected leaf (bottom) has fewer main veins and leaf lobes than the healthy leaf (top)

available. Fumigation of soil with chemicals such as dichloropropene, applied well before planting time, eliminates many of the eelworm vectors. No curative chemical is available to eliminate the virus inside the plant.

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