Powdery Mildew in Apples: Growing Concerns

Fire blight can decimate an orchard, starting in early spring as soon as blossoms develop; it spreads blossom-to-blossom via rain, wind and pollinators. When average temperatures reach 60º F or more, and the relative humidity is 60% or more (or rain occurs), these bacteria can enter a new host and cause infection. Infections can continue