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I've recently seen mosquito larvae in the water reservoir of my containers. The planters are situated in such a way that prohibits tipping them to empty the reservoir. I know that a film of oil over the water should kill them, but what type of oil should be used? I sure don't think I want to use a petroleum-based oil. Or is there an additive that can be added to the water that will kill the larvae without harming the plants (tomato and pepper)? Paul
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