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Roaches multiply quickly, which is why an infestation can spread so fast. Female American cockroaches lay about 12 eggs in each egg case, called an ootheca. They can lay six to 14 ootheca during their short lifespan. German cockroaches lay four to five ootheca in their lifetime, with each carrying 20 to 40 eggs. Many roaches can have 100 to over 200 offspring during their lifespan.

To keep animals out, you must prevent them from entering. As long as they can get in, the problem will persist. That said, consider making your attic less inviting using deterrents like motion-activated lights or ultrasonic devices. Additionally, keeping a well-maintained, clean, and uncluttered attic that you regularly inspect for activity may make the space less attractive to critters.

Whether a one-time spray treatment to control mosquitoes is enough depends on multiple factors. Often, you’ll notice a big difference after one application. However, mosquitoes are likely to return if you don't reduce attractive standing water habitats. This usually takes four to eight weeks if it’s still prime mosquito season.

Male carpenter bees actually don't have a stinger, but they will hover around areas as a defense mechanism to deter intruders. However, females can sting but are not typically aggressive and tend to only sting when threatened or provoked. They are less active at night, so you are less likely to encounter them because they tend to rest at night.