DiseasehighJun–Sep

False Mildew

Peronosporaceae

This description was machine-translated.

How to spot it

You will find that the False Mildew is not a true fungus, but an oomycete that comes from the underside of the leaf, unlike the True Mildew. On the upper side you see yellow‑square spots, below a gray‑violet coating. On cucumber, onion and lettuce it can collapse entire stands within a few days once it is wet and warm.

Prevention

Water in the morning and only at the roots, so that the leaves dry by evening. Keep generous plant spacing for good airflow and choose resistant varieties such as cucumber Saladin. Remove infected leaves immediately and do not put them on the compost.