Are all Powdery Mildews a Severe Problem?
Powdery mildews can have substantial effects on yield, as they rob the host plant of nutrients, reduce the photosynthetic process, increase respiration and transpiration, impair growth, and reduce yields. Powdery mildews rarely kill their host plant, in fact some appear to be of little concern at all. Lilac powdery mildew can reappear year after year, with little impact. Others can be very damaging, such as those that attack many cereals and some fruit.
