There are several ways to kill spider mites instantly, according to the search results:
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Insecticidal soap: This kills spider mites on contact and leaves a residue that keeps new ones from invading for 30 days or more.
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Rubbing alcohol: Rubbing alcohol kills spider mites by dehydrating them. Soak cotton balls in rubbing alcohol and wipe across the foliage of infested houseplants. Let the rubbing alcohol sit on the plants for a few hours, and then rinse the leaves thoroughly with water.
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Water: Most species of mites thrive in dry, warm weather, and a very effective control is to regularly spray plants with hard blasts of water, aiming especially at the undersides of leaves or needles. This treatment needs to be repeated regularly to keep the mites and their eggs from regaining a foothold on the plants.
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Neem oil: Neem oil is a proven pesticide that can not only kill the spider mites on contact, but it can also get rid of them for good. Mix Pure Neem Oil with Coco-Wet and apply every 3-5 days to kill pest eggs indoors and interrupt the reproductive cycle. Make sure to spray all plant parts.
It is important to note that some plants may be more sensitive to certain treatments, so it is recommended to test the product on one or two plants before treating the rest of the plant. Additionally, chemical pesticide use actually encourages the spread of spider mites by killing the beneficial insects, so it should be avoided.
