Chrysanthemum stunt viroid

Damage. This disease, found only on plants of the Asteraceae family and mainly on the chrysanthemum, produces a stunted plant, often only half the normal size but without any distortion. Flowers often open one week earlier than normal, and may be small and lacking in colour.

Life cycle. The virus enters gardens and nurseries through infected cuttings, and is readily transmitted by leaf contact and by handling.

Control. Symptoms may take several months to appear, thus seriously reducing the chance of early removal of the disease source. The grower must use preventative control. Certified planting material derived from heat-treated meristem stock (see tissue culture) reduces the risk of this disease.

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