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How to Use Volck Oil Spray on Trees | Home Guides | SF Gate Mix 2 1/2 ounces of Volck Oil Spray per gallon of water for application during the growing season or 5 1/3 ounces per gallon for use on dormant trees. On a hose-end sprayer, set the application ... Difference Between Neem Oil-Volck Oil - Garden Helper ... Aug 3, 2006 · Neem oil is extracted from a neem tree seed. It's an organically accepted oil used as an insect spray. Dormant oil refers using an oil to control pests or fungi while the plant is in a non growth or dormant period. They are heavier grade oils which could smother the plant if it had leaves on it. Volck Oil Spray - The Scotts Company Fungicides | web_app_name Volck Oil Spray may cause discoloration to blue spruce. Do not use VOLCK Oil Spray on foliage within 30 days before or after using sulfur. Do not spray when temperature is excessively high or when plants are suffering from drought. Volck oil