Botrytis (Grey Mould) of Lathyrus

Disease Information

Botrytis (Grey Mould)

Symptomsand damage

Most obvious in dank weather when it causes flower spotting. Mid and deep blue varieties are particularly susceptible being disfigured by white spots. Certain white varieties readily show brown spots, but others are more resistant. This very common and widespread disease is often a secondary infection on Fusarium or on physical damage and then appears in the form of a grey fluffy mould which can spread to kill the plant.


Difficult to control chemically, but fortunately the most aggressive strains are not the most resistant to treatment. Generally speaking, an improvement in ambient conditions will produce the most favourable results. The disease likes mild damp conditions with stagnant air, and consequently is discouraged by air movement, a buoyant atmosphere, and high or low temperatures.

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