Something is killing my plants!
I'll keep this as brief and "to the point" as possible. My back yard is mostly shade (38 oak trees) except along the driveway were it is mostly sun. This is only my second summer in this house and had to start from scratch as it sat vacant for 3 years before my arrival. I have been battling brown patch in my fescue but think I finally have it under control and will (no doubt) have to use a fungicide next year as a preventative measure. (I will reseed this fall with a more fungus resistant variety of grass, as well.)
My problem is now my other plants are dying - one by one. In the past week, I have lost a red-leaf hydrangea, wine & roses weigela, and have MANY other plants which seem to be under attack by the same "killer" including; roses, dead nettle, heuchera, daylilies, hostas, hardy geraniums, etc. I have sprayed with fungicide but it didn't seem to stop it - in fact it has been worse. It is quickly affecting more plants and I don't know what to do. I have checked for insects and cannot find any evidence of aphids, rolly-pollies, scale, etc.
I figured if it was powdery mildew or a fungus it would have been stopped with the fungicide. Anyone have an idea as to what this is? The leaves on each plant are turning brown and dying and it happens VERY quickly. There is a little evidence of a powdery mildew type fungus but don't know why the fungicide wouldn't stop it or if it even affects all these types of plants. It is basically going from bed to bed and making its way around the yard.
Wish I knew a true master gardner who could come look at it and tell me what to do. Just seems like a guessing game.