Insects such as apple scale and aphids, along with various fungal spores, are preparing to emerge with the warmth of spring. Furthermore, by reducing the initial pest population in the spring, the need for subsequent, more aggressive chemical treatments during the growing season is greatly reduced.
Dormant Oil Spray Mixing Rules for Maximum Effectiveness and Safety
If the oil dries too slowly in cold temperatures, it can cause phytotoxicity, damaging the bark. Pay special attention to the crevices and cracks where insects prefer to lay eggs.
Certain varieties of apples and pears can be sensitive to oil applications, particularly if the weather is unusually cool. Growers often schedule their treatments for a clear, calm day when the buds are tightly closed but the threat of hard frost has passed.
Dormant Oil Spray Mixing Rules for Maximum Effectiveness and Safety
Additionally, never mix dormant oil with sulfur or other treatments unless explicitly stated on the product label, as this can cause a chemical reaction that harms the tree. Because it targets the cellular level, the pests cannot develop a resistance to the treatment in the way they might with a synthetic insecticide.
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