Horticultural OIl Application
Horticultural Oils are an environmentally friendly pesticide, they are able to kill many insects and also treat some tree/plant diseases. There are a few vegetable oils that are also effective pesticides, such as cottonseed oil and soybean oil.The oil is usually combined with some type of emulsifying agent so that it can be mixed with water and used as a spray. Horticultural oils work by suffocating the insects, as well as disrupting the metabolism of the insect's eggs, and by also disrupting the ability for insects to feed; they starve to death. Horticultural Oils are human and pet-friendly, the downside to that is that the effects of the oils wear out quickly. This means that the insects have to be sprayed directly in order for this to work. Another downside to this application is that this is not a selective insecticide; this will eliminate both "good" and "bad" insects; therefore this treatment should only be used when necessary. Horticultural Oils shouldn't be applied on a daily basis and should only be applied when conditions are good. The treatment shouldn't be applied when the temperature outside is over 100 Degrees F. If applied, it could stress out the plants and cause damage to them. During freezing temperatures, the oil will not apply evenly and the emulsion does not hold together. During late fall, the plants will become more susceptible to winter damage and dieback. When sulfur based pesticides have been used within 30 days, mixing in horticultural oil will create a toxic combination of chemicals for plants. Hort-Oil is best used in treatments for adelgids, aphids, caterpillar eggs, leafhoppers, mealybug, mites, scale, spider mites, thrips, and whiteflies.