Specific virus diseases can rarely be diagnosed on the basis of
visible symptoms alone. The purpose of this fact sheet is to cover
those cases where symptoms suggest a virus problem, but are not
sufficiently specific to identify which virus is responsible.
Symptoms may include mild to moderate growth reduction, mild chlorosis or mottling, pale spots or veins and leaf deformities.
Yield decline may be the only indication of problem. It may
not be recognised unless virus-free plants are grown for comparison.
New infections appear on individual plants. However,
infections are spread through planting material from one generation to
the next, and after a few years all plants are likely to be
Virus-infested plants may show little response to fertilizers,
even where responses in other crops suggest that the fertilizers are
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Fact sheets are available on the following
chlorotic fleck virus
chlorotic stunt virus
feathery mottle virus