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Spraying for mosquitos is better than fogging. A mosquito barrier spray is designed to linger on surfaces and kill mosquitos for up to three weeks, and repeated visits from your pest control pro can keep mosquitos out of your yard all season long. Fogging is a short-term fix that only works for about 72 hours and doesn't kill mosquito larvae or eggs. If you’re concerned about the environment, a natural mosquito repellant may be better than either fogging or spraying.

Experts have mixed opinions about spraying spiders. A recent study found that chestnut and peppermint oil have a repelling effect on some spider species, but were ineffective at repelling others. You should consult with an expert exterminator to find out what works best to repel the spiders living in and around your home.

Groundhogs have a strong aversion to powerful scents, including garlic, ammonia, vinegar, hot peppers like cayenne, and predator urine. Various herbs such as rosemary, lavender, basil, mint, sage, thyme, and oregano can also act as deterrents. You can strategically use these odors around your property by planting these crops near your garden and by the entrances to groundhog burrows. Commercially available repellents offer another option, and for best results, scent-based deterrents should be used alongside other preventive measures.

The best hornet repellent includes a variety of essential oils such as peppermint, clove, geranium, and lemongrass, all of which have a pungent smell that hornets can’t stand.