Is a fungus attacking cucumber, melon, pumpkin and squash, severely.
It appears in high humidity conditions, as small chlorotic lesions.
In cucumber its defined on the lower side by the leaf veins.
They continue to expand until the leaf dies.
If you are using head irrigation with sprinklers,
you are highly increasing the chance of the appearance and spread out of this fungus.
If you can, It is better to use drip irrigation.
It is recommended to use at least 4 kinds of different pesticides,
and alternate between them every 3 days, in order to overcome pest’s resistance,
and completely exterminate them.
Best pesticides for downy mildew,