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The Proper Use of Organic Sprays and Pesticides

Posted August 13th, 2008 by Nathan Jackson in

DETo spray or not to spray? For many gardeners it’s simple; you see bugs, you get out the bug spray and the problem is solved. In a few weeks when the bugs are back, you spray again, and again. It’s a never ending cycle. As long as the plants are alive, the bug spray is close by. This has been the way gardeners dealt with bugs for decades and as a result, most of the common pests are immune to many of the pesticides used. This means you have to apply more pesticides more often to achieve fewer results. In addition to the cost and hassle involved, there are serious environmental and health issues with using pesticides. It pollutes our air and water, and has been linked to many types of cancer. Pesticides also kill off any beneficial insects in the area that would otherwise dine on the same pests we are trying to eliminate. In the last few decades alternatives have become available. Beneficial Insects are now commercially available, and are one of the most effective and environmentally friendly options you can use. However if the pest is out of control some earth friendly pesticides can help to knock their population down before you apply beneficials to clean it up. There are products on the market that are safe for the environment that won’t have long term affects on beneficial insects.

The Safer brand makes a number of products for your plants that are very safe to use. Insecticidal Soap has a high concentration of fatty acids which work by dissolving the insect’s waxy covering. This soon leads to death for the pests. You must get the soap directly on the insect, so be sure to spray both the top and bottom of the leaves. A quick internet search will turn up dozens of homemade recipes for soapy sprays and many of these can be quite effective. Like most pesticides, soapy sprays don’t usually kill the pest eggs, so you may need to reapply every few days as new insects hatch. Soapy sprays don’t leave a harmful residue, so after a few applications you can release beneficial insects to clean up any remaining pests and eggs.

Monterey Lawn and Garden makes an effective slug/snail bait that is safe for children and pets and breaks down into a fertilizer. Sluggo uses Iron Phosphate as its active ingredient. Simply sprinkle the granules around your plants and it controls your slugs and snails for several weeks without harming beneficials. They have a new product called Sluggo Plus which is just like the original Sluggo but with the addition of Spinosad. Spinosad is a bacteria that comes from Saccharopolyspora spinosa, a rare actinomycete collected from soil in an abandoned rum distillery on a Caribbean Island. When ingested it excites the insects nervous system which eventually leads to death. It works great on earwigs, sowbugs, and other insects that might eat it, but it does not work well on sucking insects like mites and aphids. There are other bacterias available for control of specific insects such as Bacillus Thuringiensis which controls caterpillars or fungus gnats.

Dustin MizerBacterias are very safe to use and do not harm beneficial insects or people and pets. There are safe and nontoxic options for inside your house as well. Citrus Sprays made from oranges can be used to control insects in your house and kitchen. They work on contact and have a pleasant orange scent. Diatomaceous Earth and Powder Guard can be used where the insects are actually entering your house. Diatomaceous Earth is made from crushed up ancient sea creatures and Powder Guard is made from crushed lime stone. Both are a very fine powder, but to an insect they are very abrasive and when the pests walk through it, they get tiny cuts all over their body. They soon lose precious body moisture and die. A hand powered machine called the Dustin Mizer can be used to spray a fine layer of D.E. or Powder Guard in a perimeter around your house or plants.

There are many horticultural oils available that can be applied to control pests. Neem oil is commonly used; however when used in heavy amounts it can go systemic and actually enter into the plant tissue. As with any of the above mentioned sprays and controls, they are most affective to knock down the insect population. For best results Beneficial Insects should be released soon after to help clean up any remaining eggs and insects. For insect pests it seems Mother Nature has the best controls.

Nathan Jackson is the owner of Nature’s Control and Ladybug Indoor Gardens. You can send your specific bug questions to nathan@naturescontrol.com. For more information, to request a catalog, or to find a local distributor, visit Naturescontrol.com or call 541.245.6033.

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