Powdery mildew is a very common plant disease among the berry family.
Damage from powdery mildew shows up on berry plants in the form of a whitish or greyish powder. This ashy like powder can be found on almost all parts of the plant, and especially on the leaves, fruit and younger cane tips. In addition, powdery mildew may cause the canes to grow in a distorted manner so that canes are dwarfed or crooked. Powdery mildew can also cause the berries themselves to wither and die off. Powdery mildew is composed of fungal patches and spores.