Monterey Horticultural Oil’s mode of action is through suffocation of eggs, larvae and nymphs of insects and mites and adults of soft-bodied insects. This mode of action necessitates total spray coverage. As a fungicide Monterey Horticultural Oil interferes with the attachment of the pathogen to the host and acts as a suffocant. Monterey Horticultural Oil may be used to control mite and insect pests in the egg stage, including: spider mites, eriophyid mites, armored scale, soft scale, mealybugs, psyllids, whiteflies, aphids, leafrollers, leaftiers, webworms, cankerworms, plant bugs, leafhoppers and adelgids. Monterey Horticultural Oil will kill other immature forms if spray covers the insect.