Summer oil

Summer Oil, Dormant Oil, Horticultural Oil.. Does it Matter?
By Marie Iannotti, About.com Guide
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summer oil A light, refined horticultural oil used during the growing season to control insect pests and diseases.

Summer oil is used on leafy plants during the growing season. Generally, it's the same as narrow-range, superior, and supreme oils.

Agri-mek, summer oil, Kelthane
Carzol
1 Check EPA and state registration status by contacting local Cooperative Extension representative. Registration status is changing annually and is not universal across all state lines.

HORTICULTURAL OIL: This includes both a dormant oil and a summer oil - used to smother eggs and developing insects on trees and ornamentals. The heavier oils are used in the late winter or very early spring, making sure the temperatures are over 40?

The highly refined oils are often called summer oil, and can be used while the plant is growing; heavier oils are called dormant oil and are applied to deciduous plants while dormant.
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Make your own powdery mildew spray by combining 3 teaspoons baking soda with 2 tablespoons highly refined summer oil and 1 gallon of water. Spray every 10 days to two weeks.
Photography by Suzanne DeJohn/National Gardening Association ...

See also: Plant, Horticultural, Insect, Growing, Water