Oregon State University Extension Service

Can I compost plants with powdery mildew?


Should be no problem at all. Powdery mildews only survive on a living host and the composting process will kill the fungus as well as the plants. Not many plant pathogens survive the process. There is some evidence that plants with Verticillium wilt might survive and be a problem when used as mulch. Check out these resources in the PNW Plant Disease Management Handbook:

Source URL: https://extension.oregonstate.edu/pests-weeds-diseases/plant-diseases/can-i-compost-plants-powdery-mildew