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Brown recluse spiders are most active at night. As the name “recluse” suggests, they prefer the dark, which is when they hunt small insects and other spiders. Regarding the time of year, brown recluses are more likely to be seen during warmer months, typically between March and October. 

The same heat treatment that’s effective on flea eggs will also destroy the adults. There are four stages of the flea life cycle—egg, larva, pupa, and adult—and you’ll have to keep all of them in mind when taking on a pest infestation in your home.

Squirrels hate not having access to secure shelter or food sources. Your best line of defense is to make your property less attractive by removing access to these things. There are chemical squirrel repellents, but these have mixed success. According to Pennsylvania State University, you can apply products containing the bittering agent denatonium saccharide to a squirrel's favorite fence, tree, or roof spots. However, you need to reapply repellents regularly, which aren’t scientifically proven effective.

The best way to ward off roaches is to take preventative measures and stay on top of routine extermination services. Keep them away by cleaning your kitchen free from crumbs, properly storing away food, covering your pet’s food bowl, and reducing moisture in your home to make your house less tempting for roaming cockroaches. Remove clutter—especially cardboard boxes that roaches love to hide in, and replace them with plastic tubs.