Photo courtesy of Fiver13 at Flickr.com.
While they may not be as effective as complex chemical poisons, several simple chemical compounds are available that that any organic gardener can safely dust onto his or her plants without any worry of degrading the environment.
Copper sulfate, for example, works as a general purpose bactericide and fungicide. Lime sulfur (calcium polysulfide) also works as a bactericide and fungicide, but has an insecticide effect as well. Pure elemental sulfur is particularly effective: it kills many types of mildew and fungi, not to mention spider mites, thrips, aphids, and leafhoppers.
You should be able to get all three at a large garden center. Failing that, they’re all easily available over the Internet.
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i think that the picture looks so nutricious and the information you provided N D above helped me alot in my chemistry of gardening research.