Paraffin oil

Paraffin oil (CAS 8012-95-1) is a high-quality mineral oil used extensively in modern horticulture and integrated pest management systems. It acts as a potent contact insecticide and acaricide, primarily used to control overwintering stages of pests on fruit trees, vines, and ornamental plants.

The primary mode of action is physical rather than toxicological. When applied, the oil creates a thin film that covers the surface of insects, mites, and their eggs. This coating creates a barrier that prevents respiration, leading to suffocation. Furthermore, it interferes with the membrane structure of eggs, preventing them from hatching.

Target pests effectively controlled by paraffin oil include scale insects, mealybugs, aphids, spider mites, and leafhoppers. It is often applied as a dormant spray or early spring treatment, providing a clean start for the growing season by reducing the initial pest population density in the orchard.

Application requires careful attention to environmental conditions. It should not be applied when temperatures are extreme, as excessive heat can lead to oil-induced phytotoxicity on leaves. Furthermore, uniform coverage is essential, as the effectiveness depends entirely on the physical contact between the oil droplets and the pest.

Safety and compatibility are critical aspects of using paraffin oil. It should never be tank-mixed with sulfur-containing products, as the combination can cause severe leaf burn. Always ensure a sufficient interval (usually 2-3 weeks) between applying oil and other incompatible chemical agents to maintain plant health and safety.