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Control Insect by Organic Spraying

Insecticidal sprays are materials that kill insects or limit the activity of insects through toxicity compound or physical action on the organisms.  The grower could be use some materials described to their organic garden

Insecticidal soaps
Soaps or detergents lessen the surface tension of water, allowing water to spread smoothly over the surface of leaves or insects and thereby improving the effectiveness of water as an insecticide. Soaps and detergents also are insecticidal. Dishwashing detergents are insecticidal but also are phytotoxic. With most certifying norganizations, only soaps are considered to be organic pesticides.

Mineral oils
Highly refied mineral oils are applied as emulsions in water and are an organically acceptable chemical control. Oils coat bodies of insects and suffocate them. No insect is known to have resistance to oils. Oils kill eggs and are very effective against scales, which otherwise are difficult to attack with insecticides

Alcohol

Scale insects can be wiped from plants with a cloth or cotton ball wetted with the undiluted alcohol. Insects such as mealy bugs can be daubed with undiluted alcohol with cotton applicators on a stick. Alcohol sprays can be prepared from 8 to 16 flid ounces diluted into a quart of water, a dilution of one part alcohol to two to four parts water by volume. Alcohol is used against pests such as aphids, scales, and whitefles.

Milk
Milk has insecticidal properties due to its proteins (globulins). Any kind of milk can be used. It is effective against soft-bodied insects such as cabbage worms. Milk also has some effects against fungi and viruses.

Nicotine
Nicotine is an alkaloid from tobacco and is a powerful insecticide, one of the most toxic of the botanical insecticides. It is effective against most insects. It can be applied to soil or to foliage. A wetting agent (soap or detergent) in the spray helps with coverage of foliage. The fumes from nicotine are effective in control of insects, such as aphids, whitefles, leafhoppers, and thrips that may be on the undersides of leaves or in the whorls of plants where liquid sprays may not reach.

Neem
Neem or neem oil is extracted from seeds of the neem tree (Azadirachta indica), which is common in Africa and India. Neem is related to the chinaberry tree (Melia azadarach), which grows in the southern United States. Extracts of seeds of either species have insecticidal properties. The extracts have repelling, hormonal, and toxic
effects against a broad spectrum of insects in larval or adult stages

Limonene
Limonene is refied from citrus oils that are extracted from peels of oranges and other citrus fruits.It has low oral and skin toxicities to mammals and dissipates rapidly from surfaces, leaving no residual effects. Limonene is a contact poison to insects but may have fumigant activity. It is used more commonly against external pests of pets to control flas, lice, ticks, and mites. Commercial products are available as sprays, aerosols, shampoos, aerosols, and dips.