Turnip mosaic virus (TuMV) can be a severe disease on cabbages and other types of brassicas.
Many weeds are hosts to this virus.
This makes the situation worse for growers of cole crops, since aphids are a key source for this virus. The weeds can harbor both the aphids and the virus.
Since there is no cure for turnip mosaic virus, control is of paramount importance.
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We will describe the many facets of this virus and how to control it.
Types of Plants Affected
Turnip mosaic virus has a phenomenally wide host range – at least 318 species of plants in 43 families! And it infects plants all over the world.
Most cruciferous vegetables are susceptible to this virus. Among them, TuMV is the most severe on turnip, radish, mustard, and Chinese cabbage.
Hosts in other families include spinach, beets, lettuce, rhubarb, and tobacco.
Damage
While the yield losses for plants infected late in the season are usually low, TuMV can be devastating if it infects its hosts early in the season.
If it strikes in the seedbed or soon after transplanting, losses can be as high as 75%.
Symptoms
TuMV can infect the whole plant.
The symptoms of this disease vary depending on which host it infects and the stage of growth of the plants.
Symptoms on the young leaves include yellow round spots.
Cabbage, broccoli, and cauliflower leaves develop light green circular lesions that are up to five inches wide.
The tissue in these lesions dies as the infection progresses. Even worse, the lesions may join together and result in the complete loss of leaves.
The plants may be stunted and senesce prematurely.
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