By blocking the spiracles (breathing pores) of insects like aphids, spider mites, and scale insects, it causes suffocation. The oil degrades quickly after application, leaving minimal residual toxicity.
Monterey Horticultural Oil Pest Control Guide: How It Works and Target Pests
Never mix the oil with sulfur or certain copper-based fungicides, as this can lead to plant injury. Target Pests and Disease Control Monterey Horticultural Oil is a versatile tool effective against a broad spectrum of plant adversaries.
Similarly, the oil creates a physical barrier that disrupts the cellular membranes of fungal spores, such as those causing black spot and powdery mildew, preventing germination and infection. This contact action requires thorough coverage, as it only affects pests directly contacted by the spray solution, making precise application timing critical for success.
Monterey Horticultural Oil Pest Control Guide for Targeted Insects and Diseases
The primary application occurs during the dormant season, typically late winter or early spring before bud swell, to eliminate overwintering pests and their eggs from trees and shrubs. A secondary application may be applied during the growing season, but only on plants known to be tolerant and when temperatures are consistently below 90°F (32°C).
More About Monterey horticultural oil
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