Winter spraying of fruit trees and roses can begin now to prevent overwintering of insect and fungal problems. Dormant Kits are typically used for this purpose. They are a combination of lime sulphur and horticultural oil. It is recommended spraying 3 times over the course of the winter. Space your applications 3-4 weeks apart and be sure to spray on a dry day that is above freezing. This provides a huge advantage to your 2013 growing season.
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