![]() ![]() Ideally, oil should be applied on a clear, non-windy day in the 50 to 70☏ temperature range. Only apply oil if temperatures remain above freezing (ideally above 40☏) for 24 hours after application. peach/nectarine: pre-bloom (when the pink shows through the bud).apple: half-inch green (ideally, application is made at green tip stage).The last point at which you can safely apply oil is: The window for application extends from bud swell to when leaves just start emerging. There are a few factors that must coincide to determine when to spray: the bud stages of your fruit trees ( pictures of fruit bud stages), and temperature. Oil should be applied at a rate of 2%, which is 5 Tbs in 1 gallon of water.Make sure you thoroughly cover all cracks and crevices.When spraying apple trees, add in copper for fire blight.Mix oil with an insecticide such as Warrior or Asana.Oil should be applied at a rate of 2%, which is 2 gallons per 100 gallons of water. ![]() In northern Utah, it is approaching time to apply the spray in some areas. It keeps illnesses like Pythium blight and powdered mildew at bay. In southern Utah, dormant oil should already have been applied. Therefore, unable to be washed away by water. This coincides with the increasing activity of the overwintering insect, such as aphid eggs, scale nymphs, and peach twig borer larvae. It causes unsightly dark, sunken lesions on leaves, stems, flowers and fruits. A better term would be a “delayed-dormant” application, because the oil should be applied after bud swell. 1 / 10 Markus Keller/Getty Images Anthracnose Anthracnose is a common disease among deciduous trees, especially sycamore, ash and oak. Spray all surfaces of the orchard (including trellis posts and other inter-mingled tree crops) as a high volume spray.ĭespite the fact that we call it “dormant oil”, the timing of a horticultural oil spray is not when trees are still dormant. The primary purpose of this treatment is to help reduce the bacteria on the orchard surfaces. It is OK to mix with 2% oil for the insect treatment. ![]() For fire blight, apply copper to apple/pear between swollen bud and green tip stages. ![]()
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