They are useful for killing overwintering mite eggs and, therefore, can help to suppress infestations of spruce spider mites, European red mites and southern red mites which overwinter as eggs on infested plants. A dormant oil spray will not guarantee mite-free plants the following year, but will delay mite buildup the following spring. When using any type of oil, be aware that these sprays will discolor many conifers that have a bluish, waxy coating on their needles. Maples, hickories, black walnut, smoketree and azaleas also tend to be oil sensitive. These products are useful in the warmer months when plants are actively growing, and may also be used to control cool season mites.
Thorough coverage is essential.
Trade names are used as examples. No endorsement is intended, nor criticism implied of similar products not named. The use of some products may not be legal in your state or country. Please check with your local county agent or regulatory official before using any pesticide mentioned in this publication.