Oils have been used by farmers and gardeners alike long before chemical pesticides came to be. The unique oil used was referred to as dormant oil because it was unsafe to use on a rising plant, but would not trigger harm when it was dormant. Because of this tradition, oils designed to be applied to a dormant plant are now referred to as “dormant” oils, although they are much safer for dormant and lively plants alike.
When to Spray
Dormant oils are most effective when utilized to a dormant tree, shortly earlier than bud break. The temperature should be above freezing for not less than 24 hours, although the optimum time is when temperatures remain between forty and 70 levels Fahrenheit. Applying oils during freezing weather will end in uneven coverage. Never apply dormant oil to evergreen trees.
Advantages of Dormant Oil
As a result of dormant oil is a mechanical means of insect management, it’s unlikely that insects will develop a resistance to the oil. It’s utilized on to particular bushes when the target insects are dormant, thus lowering the impression on helpful insects. Dormant insects are affected throughout the board and even eggs may be destroyed utilizing dormant oils. Since they are highly refined, dormant oils have little impression on animals or humans.
Dormant Oil Chemicals
Dormant oils are now not made of unrefined petroleum products, but they do nonetheless comprise oils from varying sources. Most comprise naphthene and paraffin in various portions. Generally, the paraffin is in larger parts and the naphthene in smaller parts as a result of it is extra possible to damage plants. Some dormant oils additionally include sulfur, which can be indicated on the label as unsulfonated residue. A better rating signifies a lower amount of sulfur.
Many Horticultural Oils
Dormant oil is only one type of trendy horticultural oil. The term “dormant” is used to consult with oils which might be applied in the course of the dormant season, slightly than a selected kind of oil. Superior oil is a description that applies to all fashionable horticultural oils — these are more refined oils that may be applied to foliage as well as woody plant elements and are thus secure to make use of on growing plants. Neem oil is an oil derived from the seeds of the neem tree (Azadirachta indica), it has each fungicidal and insecticidal properties. Vegetable oils are somewhat effective for insect control, but the results are combined.
College of Illinois Extension; Just What’s Dormant Oil?; Sandra Mason; March 2005
Oklahoma State College Extension Service; Dormant Oil; 2006
Colorado State College; Pest and Disease Control Utilizing Horticultural Oils; Whitney Cranshaw; 2010