The purpose of preventative treatments is to avoid the emergence of insects and disease that can harm trees and shrubs. The application of most preventative sprays should be when trees are in the winter dormant period. Some preventative sprays can be applied in the summer (fungicides) as a preventative protector. While the goal is prevention, some sprays also kill existing active infestations. These products, Horticultural Oils or Fungicides, are very effective tools when used under proper timing and application conditions.
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