A scientific study has shown that corn plants sprayed with tomatoe leaf spray attracted significantly more Trichogramma wasps to parasitize the corn earworm eggs than the unsprayed did. Soak 1 to 2 cups of chopped or mashed tomatoe leaves in 2 cups of water overnight. Strain through cheescloth or fine mesh, add about 2 more cups of water to the strained liquid, and spray. For aphid control, be sure to thoroughly cover the leaf undersides, especially of lower leaves and growing tips of plants where aphids congregate. Organic gardeners have long been familiar with the repellent or toxic affect of garlic oil on pests.
Some studies also suggest that a garlic oil spray has fungicidal properties.
Good results, with quick kill, have been noted against aphids, cabbage loopers, earwigs, June bugs, leafhoppers, sqaush bugs and whiteflies. The spray does not appear to harm adult lady beetles, and some gardeners have found that is does'nt work against the Colorado potaoe beetles, grape leaf skeletonizers, grasshoppers, red ants, or sowbugs. Soak 3 ounces of finely minced garlic cloves in 2 teaspoons of mineral oil for at least 24 hours. Stir thoroughly and strain into a glass jar for storage. If this is effective, try a more dilute solution in order to use as little as possible.