Paraffin oil

Paraffin oil is a highly refined mineral-based substance classified as an insecticide and acaricide. It acts primarily through physical contact rather than systemic chemical poisoning, making it a valuable tool in integrated pest management programs for various commercial and ornamental crops.

The mode of action for paraffin oil is purely mechanical. Once sprayed on the plant surface, the oil forms a thin film that covers pests, their larvae, and eggs. This film clogs the insects' spiracles, effectively suffocating them. Additionally, the oil disrupts the integrity of insect eggs, preventing successful hatching.

Paraffin oil is commonly used to control scale insects, aphids, spider mites, mealybugs, and whiteflies. It is widely applied in orchards to treat fruit trees against overwintering pests, as it is effective against eggs and nymphs that are often resistant to traditional chemical insecticides.

Successful application depends on thorough coverage of the plant, including the undersides of leaves and crevices in the bark. Because the product works by contact, "spotty" application significantly reduces its efficacy. It is essential to ensure that the spray reaches all areas where pests are likely to reside.

Safety and handling are critical when using paraffin oil. Avoid spraying during extreme heat, as this can increase the risk of leaf burn (phytotoxicity). Furthermore, do not mix this oil with sulfur-based products, as the combination can be toxic to plant tissue. Always wear appropriate personal protective equipment and follow label instructions regarding dilution ratios.