Some cultivars will not show true
wilting though leaves may turn a reddish colour or show marginal
burning. These symptoms gradually develop higher up the plant.
Cuttings must only be taken from
plants that have remained vigorous for the whole season. Sterilised
components should be used for propagation and growing on in pots. The
commercial use of heat therapy can do much to control this disease
since tip cuttings produced by this method are likely to be clean of
the disease even if the parent stools are infected. If plants have to
be grown in an open bed that has previously produced diseased stock it
would be sensible to treat the ground with a soil sterilant prior to
Impact/effects on chrysanthemums
Leaf and stem death as a result of disruption to the internal xylem
and phloem systems.
There is no chemical control for this disease.
Alternative control actions include
- only take cuttings from healthy, vigorous plants
- Remove infected plants or parts of
plants and dispose of, but do not compost.
- Clean all implements thoroughly as
the fungus can be spread in soil on spades and muddy boots, and
perhaps other common tools.
- The fungus can remain in infected
soil for years, so once the disease has been discovered, resistant
plants should be planted.
- Lightly affected plants may
recover. This can be aided by application of nitrogenous fertilisers
(but not nitrates) to boost the growth of new wood, which may remain