Surface coating or powder
Powdery mildew: white dusty patches on leaves
White, flour-like spots on the top of leaves are usually powdery mildew. Remove affected leaves early, because new spores can appear every…
Bud rot: brown, dying buds and gray fuzz
A browning, dying section of bud, sometimes with gray fuzz, usually means bud rot. It can't be cured and it often starts…