1

Yes, it is Erysiphe cruciferarum - powdery mildew. I have not treated this myself. Bicarbonate sprays have been used successfully on moderate infections. If the plants are in pots then keep them out of the rain, otherwise you have to repeat the applications. If you can find it easily, Potassium Bicarbonate is better, and is sold commercially for this ...


1

Yes this looks like mildew, probably because the weather has chanced and the moisture levels in the air are higher now. I have treated mildew once, not on kale but on an oak bonsai tree. I used a mix of milk and water (40/60%), and sprayed the affected leaves. It worked very well, and is organic without chemicals. I don't know why it works, but it does work. ...


1

Looks like some other cole ,like kohlrabi ;it is difficult to identify from photo.


Only top voted, non community-wiki answers of a minimum length are eligible