Blue mould



Scientific Name

Peronospora tabacina 



Blue mould (Downey mildew) is a disease of tobacco that can decrease yield substantially if infestation occurs early in the growing season. Infected seedlings will have yellow spots on upper leaf surfaces, with blue-grey mould on the leaf undersides.  Seedlings can be killed by the fungus quickly. Lower leaves of larger plants in the field are infected first.

Similar symptoms occur – yellow lesions on upper leaf surface with a greyish mould on leaf undersides.  Fungus travels through plant vascular system, causing wilting and plant lodging. Under ideal conditions there is potential for severe infestation as spore re-generation can occur every 10 days.


Chemical Control

Products that control

  • Aliette


Region:  Other

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