I’ve got probably 70 American Chestnut seedlings, and the other day, I discovered one seedling with a whitish leaf. Of course, as I then started looking for this on other seedlings, I identified 13 plants with leaves showing this condition at varying degrees.
I believe it’s powdery mildew (maybe a oak specific type - I know those also infect castanea, and to a lesser extent, beeches).
Can anyone confirm that this is powdery mildew?
Also, do anyone have suggestions for battling this problem? I see a lot of different solutions for powdery mildew online, but it seems like everyone have got their own personal concoction 
I also wanted to note that it seemed to be the seedlings situated towards the center of my growing area that were affected. I suspect that these plants get much less air circulation than the ones on the periphery/boundary areas. I’m planning to rearrange the growing area (have been for a while, there has just been to much things to do), to create better space and air circulation between the plants. The plants which I identified as being “infected” with this, I’ve moved far away from the area and cut off the leaves. The leaves were bagged and sent to the public recycling (incineration).
