Definition of summer oilCategorized under "General"
Definition as written by paulgrow:
A powerful oil type insecticide for fruit trees, ornamentals, and vegetables. Dormant and Summer oils are classified as suffocants because the emulsion readily breaks forming an oil coat on the insect or larva. The oil plugs the breathing tubes, therefore suffocating the insect. This product is non-hazardous to other living animals.
This information courtesy Michigan State University.
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