Per the Dormant Oil product label: Ornamentals: 3 tablespoons (1.5 oz.) per gallon of water, Fruit Trees: 6 tablespoons (3 oz.) per gallon of water (same for shade trees).
Yes, Dormant Spray Oil can be applied outdoors in April as long as the temperature does not exceed 85 degrees Fahrenehit.
It is recommend that Hi-Yield Dormant Spray Oil be applied when the temperature is between 45 degrees and 85 degrees.
Dormant seasons are the times of the year when trees are not actively growing. This will vary from region to region and by type of tree. We recommend that you contact your local cooperative extension office and ask for information on the type of tree you are treating and the time of year it is dormant (almost all trees are actively growing now in the USA).
Per the Dormant Oil product label: Ornamentals: 3 tablespoons (1.5 oz.) per gallon of water. It can be used on ornamental trees any time depending on your target pest. We recommend that you contact your local cooperative extension office and ask for information on the best timging for the type of pest you are treating.
A small amount of oil overspray of a product such as Hi-Yield Dormant Spray should not harm your turfgrass. We do not recommend spraying an oil like this on your turfgrass on purpose, though, since the oil could be a bit heavy for the turfgrass, especially in hot weather (over 85 degrees).
Hi-Yield Dormant Spray Oil may be used on fruit trees only during the dormant season, which occurs prior to bud swell. Applications may be repeated at intervals of 3 to 4 weeks during the dormant season.