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McPartland, John M. 1997. Cannabis as repellent and pesticide. Journal of the International Hemp Association 4(2): 87-92 Cannabis has been used as a pest repellent and pesticide in a variety of formulations. It has been planted as a companion crop to deter insects, nematodes, fungi, and weedy plants. Dried leaves and flowers have repelled or killed insects, mites, nematodes, and weeds. Plant extracts (either aqueous or polar organic solvent extracts) have killed or repelled insects, mites, nematodes, fungi, weedy plants, bacteria, and protozoans. Pure cannabinoids reportedly inhibit or kill bacteria, fungi, and insects. The validity of some of these reports is debated. Most of the scientific literature describes in vitro experiments, few studies concern field work. Utilizing left-over Cannabis leaves against pests appears to be a possible use for this harvest residue.
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