Organic gardeners can easily make a pest repellent from hot peppers with particularly high levels of capsaicin, such as serrano peppers or habanero peppers.
The capsaicin in the pepper spray deters mammals, such as squirrels, rats and rabbits, from eating fruits and vegetables, yet the animals will not be harmed.
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Other articles regarding pests and diseases:
Five DIY Remedies for Pests in the Home Garden
GardenZeus Solutions to Common Abiotic Problems with Garden Tomatoes