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The botanical insecticides break down readily in soil and are not stored in plant or animal tissue. Often their effects are not as long-lasting as those of synthetic pesticides.
In addition to botanical insecticides, other biological products can help in the battle against insects. However, some of these compounds may be difficult to find. Bacillus thuringiensis (B.t.) is an effective product commonly used against moth larvae. B.t. is a bacteria that produces a toxin quite lethal to caterpillars, but nontoxic to beneficial insects and mammals. B.t. is most effective on young larvae. New strains of B.t. have been developed to work against other types of insect larvae. Another biocontrol product available to gardeners is grasshopper spore. It is not proven for small-scale use, but may help gardeners reduce damage by grasshoppers. Commercial insecticidal soap, a special formulation of fatty acids, has proved effective against aphids, leafhoppers, mealybugs, mites, pear psylla, thrips and whiteflies. Homemade, soap sprays also work to some extent. They can be formulated by combining three tablespoons of soap flakes (not detergent) per gallon of water. Spray on plants till dripping. Repellent sprays, such as garlic sprays and bug sprays (made from a puree of bugs), have been reported as useful by some gardeners, but their effectiveness is questionable. Some researchers believe that bug sprays may work if a disease is present in the insect macerated and that disease is spread through the spray to other insects. Apply all insecticides locally, to take care of a specific pest problem, instead of blanketing the entire garden. Call your local Extension office for specific recommendations.
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