Common Fall Pests in Arizona and Tips on How to Deal With Them

During the months of September, October, and November in Arizona, the temperature starts to drop, and together with it comes a variety of pests. If you are living in areas where the risk of all pests is high, it is important to be prepared and know how to deal with them.

Join us as we talk about some common fall pests in Arizona and how to get rid of them.

Common Fall Pests In Arizona

1. Brown Marmorated Stink Bug

Brown Marmorated Stink Bug in arizona

The brown marmorated stink bug, an invasive pest native to Asian regions, is one of the major pests to watch during the fall season in Arizona. Originally believed to have been unintentionally introduced in Allentown, Pennsylvania in the late 90s, this bug has now become a significant fall invader.

The primary issue with these pests is the irritating infestations they can cause in residences, often in large numbers, causing distress among homeowners.

Furthermore, these stink bugs pose a serious threat to various crops, including fruits and vegetables, making them an unwelcome guest in any setting. Stay alert for these fall invaders as the season changes.

2. Box Elder Bugs

Box Elder Bugs in arizona

Another bug that becomes a nuisance during the cooler months in Arizona are Box Elder Bugs/Boxelder bugs. As the temperatures decrease, these insects seek shelter in homes and other buildings, adding them to the list of common fall pests.

Unlike other pests, Box Elder Bugs are usually harmless to humans and do not pose a threat in terms of stinging, transmitting diseases, or biting, though there have been rare incidents of defensive biting reported.

They are also not known for inflicting damage to homes or plants on a significant scale. However, homeowners should be aware that their feces can cause staining on light-colored surfaces.

3. Scorpions

Scorpions in arizona at fall

While seen most frequently from March through October when temperatures rise above 70 degrees, scorpions are one of the common pests in Arizona, especially during the summer months. Their activity increases with the warmer weather, as they emerge from their winter shelters in search of food and mates.

Being household pests, they often find their way into homes, causing fear and potential health risks due to their venomous sting. Therefore, as part of fall pest control, careful attention should be given to these tenacious arachnids.

4. Mosquitoes

arizona mosquitoes

These small pests should not be taken lightly as they are active during the night and are known to spread numerous diseases to people, including the Zika virus, West Nile virus, Chikungunya virus, dengue, and malaria.

Like other insects, mosquitoes tend to become more prevalent in the cooler weather of the fall season in Arizona. They often sneak in through tiny gaps around window frames and other access points, making them a common fall pest.

Comprehensive fall pest prevention measures should be taken to mitigate the risk of infection, which includes sealing gaps around homes and ensuring the surroundings are clear of stagnant water where they breed. Mosquitoes, together with other insects, contribute to the challenges of pest management in the fall season in Arizona.

5. Crickets

arizona crickets at fall

Crickets, while not generally harmful or dangerous, do become a nuisance pest for many homeowners, especially when their night-time concerts disrupt sleep. These vocal insects aren’t entirely innocent, however.

Once inside, field and house crickets may feed on various fabrics like cotton, silk, wool, fur, and linen. Moreover, their primary danger lies not in their bite, but in the potential for carrying parasites and diseases, such as Escherichia Coli and Salmonella.

During the temperature drop in the fall, field crickets often invade homes, seeking warmth. Therefore, as part of an effective strategy to prevent pests, it’s essential to be vigilant when the seasons change, adding crickets to the list of common fall pests in Arizona.

6. Caddisflies

arizona Caddisflies

Caddisflies, with their moth-like appearance, are another fall pest in Arizona. Though they pose no direct harm to humans, their propensity to swarm in large numbers can become a source of distress.

They are particularly attracted to lights, often leading them to invade residential spaces after dusk. Living in close proximity to lakes and rivers, they become a disruption with their high population density.

There have also been reports associating the presence of Caddisflies with instances of allergic reactions and asthma, further qualifying them as a nuisance. Understanding their life cycle can be beneficial in managing their population and mitigating their impact.

The primary food sources for Caddisflies are detritus and microorganisms in water, which contributes to their life cycle and their propensity to congregate near water sources.

7. Cluster Flies

cluster fly in arizona

Cluster flies or attic flies are another irritating fall pest common in Arizona. They are harmless to humans, but their tendency to gather in large numbers inside homes, especially in attic spaces, makes them a significant nuisance. They are typically attracted to warm, sunny spots.

While they don’t pose a health risk or cause damage, their presence can be distressing for homeowners. Therefore, taking preventative measures to seal potential entry points in your home is a reliable method for managing cluster fly infestations.

8. Asian Lady Beetle

Asian Lady Beetle in arizona

Asian Lady Beetles, despite their attractive appearance, are a significant fall pest in Arizona. Originally introduced as a method of natural pest control for crops, these beetles have now become a nuisance themselves. They bear a striking resemblance to the harmless ladybug but can be distinguished by a distinct ‘M’ or ‘W’ mark on their head. Asian Lady Beetles tend to mass-invade homes during the fall, seeking shelter from the cold. Their presence in large numbers can be distressing to homeowners. Additionally, they can produce a foul odor and stain surfaces when threatened.

9. Bed Bugs

arizona bed bugs

Bed Bugs, notorious for their biting habits, are a year-round menace in Arizona, but they can become especially troublesome in the cooler months when they invade homes in search of warmth. These small, flat pests feed on human blood, often causing itchy, red welts. Due to their nocturnal nature and penchant for hiding in small cracks and crevices, they can be hard to detect. Early detection and thorough treatment are crucial to managing bed bug infestations.

Special Mentions

  • Cockroaches: Arizona is home to different species of cockroaches, with the most common being the American, German, Oriental, and Brown-Banded roaches. These pests are nocturnal, known for their resilience, and can spread diseases like salmonella. They thrive in damp, dark, and dirty places, making kitchens, bathrooms, and basements their favorite habitats.
  • Termites: The most common termites in Arizona are the Subterranean and Drywood termites. These pests are notorious for causing extensive damage to wooden structures. Subterranean termites live in soil and build mud tubes to reach food sources, while Drywood termites infest dry wood directly.
  • Rodents: Rodents like the Roof Rat, Norway Rat, and House Mouse are common in the state. They pose health risks through the diseases they carry, including Hantavirus and Leptospirosis, and cause significant damage by gnawing on wiring, insulation, and structural components of homes.
  • Spiders: Arizona is home to many spider species, but the most common are the Black Widow, Brown Recluse, and the Arizona Brown Spider. While most spiders are harmless, these species are venomous and can pose a threat to humans if bitten.
  • Ectoparasites: Ectoparasites such as fleas, ticks, and mites are also common in the state. They often infest pets and wildlife, and can transmit diseases to humans, such as Lyme Disease (from ticks) and Flea Allergy Dermatitis (from fleas). Prevention methods include regular pet treatments and maintaining a clean outdoor environment.

Tips for Managing Fall Pests in Arizona

  • Keep your surroundings clean: Most pests are attracted to food and water, so keeping your kitchen and dining area clean can reduce the likelihood of an infestation. Be sure to clean up any spills immediately and keep food stored in sealed containers.
  • Seal entry points: Many pests, like crickets and Asian Lady Beetles, seek indoor shelter when the temperature drops. Regularly inspect your home for cracks, crevices, and gaps and seal them promptly to prevent pests from getting inside.
  • Manage your outdoor lights: Insects like Caddisflies are attracted to light. Consider switching to yellow outdoor lights or Sodium Vapor lamps, which are less attractive to these types of pests.
  • Manage moisture: Mosquitoes breed in stagnant water. Regularly drain any standing water around your property to prevent mosquito breeding.
  • Regular pest control service: Regular professional pest control services can help detect and treat any current infestations, and prevent future ones.
  • Check for bed bugs: If you’re traveling or have guests over, be sure to check your luggage and furniture for any signs of bed bugs, as they can quickly spread.
  • Protect your pets: Regularly check your pets for ticks, fleas, and mites and ensure they are up to date on their prevention treatments.
  • Regular home maintenance: Regularly cleaning your attic, basement, and other less accessible areas can prevent pests like Cluster Flies from gathering and breeding.

Fall can be a challenging season for pest control, but with these preventative measures, you can protect your home from an unwanted infestation.

Key Takeaways

There’s no denying that fall pest invasions in Arizona can be a significant challenge, impacting not only your comfort but also your health. Timely and strategic action is essential to protect your home and loved ones.

By staying vigilant, maintaining cleanliness, securing potential entry points, and seeking professional help when needed, you can effectively control and prevent these seasonal pests.

If you need expert assistance, don’t hesitate to reach out. At Arizona Termite and Pest Solutions, we have the experience and expertise to deal with any pest problem you might face.

Contact us today for a pest-free tomorrow.


Arizona Termite & Pest Solutions

Valley Wide Pest Control
Phoenix, Arizona

1260 N. Arizona Ave Suite E Chandler, AZ 85225



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