(Erysiphe polygoni)
Credits: Biovision-Infonet
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The disease is caused by the fungus Erysiphe polygoni (E. heraclei).
It is characterised by the development of white, powdery fungal growth on leaves. Affected leaves become chlorotic and eventually die. The fungus is seed-borne.
What to do:
- Use certified disease-free seeds if using own seeds hot water treat the seeds.
- Practise good field hygiene.
- Practise over-head irrigation where feasible.
- Spray with sulphur based products where acceptable.