1. Understanding DEET and its role in insect repellents

DEET, also known as N,N-diethyl-meta-toluamide, is a widely used active ingredient in insect repellents. It has been extensively studied and proven effective in repelling a variety of insects, including mosquitoes, ticks and flies. However, when it comes to spiders, DEET’s effectiveness is debated by experts.

DEET works by interfering with the insects’ olfactory receptors, making it harder for them to detect human scent and thus reducing the likelihood of being bitten. However, its effectiveness in deterring spiders is less well established. Spiders rely less on their sense of smell and more on touch and vibration to detect prey or potential threats. Therefore, while DEET may have some effect on spiders, its effectiveness as a spider repellent is not as well documented as its effectiveness against other insects.

2. Factors that influence spider behavior

To determine whether DEET can effectively repel spiders, it is important to understand the factors that influence spider behavior. Spiders are primarily driven by their instincts to find shelter, reproduce, and capture prey. Their behavior is influenced by several factors, including environmental conditions, the availability of food sources, and the presence of potential predators.

While some studies suggest that DEET is repellent to spiders, others suggest that spiders may become habituated to the scent over time. Habituation occurs when spiders are repeatedly exposed to a stimulus, such as DEET, and gradually become less responsive to it. Therefore, even if DEET initially repels spiders, its long-term effectiveness may decrease as spiders become accustomed to its presence.

3. Alternative Spider Repellents

Although the effectiveness of DEET as a spider repellent is uncertain, there are alternative methods that can help deter spiders from entering your home. Natural remedies such as essential oils, vinegar, or citrus peel are often suggested as spider repellents. However, it’s important to note that the effectiveness of these remedies varies, and there is limited scientific evidence to support their effectiveness.
Another approach to reducing spider encounters is to eliminate potential food sources. Spiders are attracted to insects, so practicing good pest control by keeping your home clean, sealing cracks and crevices, and minimizing clutter can help reduce the spider population in your home. In addition, using screens on windows and doors can prevent spiders from entering your home in the first place.

4. Integrated Pest Management Strategies

Rather than relying solely on DEET or other repellents, an integrated pest management (IPM) approach can provide a comprehensive solution to managing spiders and other pests. IPM combines multiple strategies to prevent and control pests while minimizing the use of potentially harmful chemicals.

Identifying and sealing potential entry points for spiders, such as cracks in windows or doors, is critical to an IPM program. Regularly cleaning and vacuuming areas where spiders are commonly found, such as corners, attics, and basements, can also help eliminate webs and egg sacs. In addition, reducing outdoor lighting at night can help minimize the attraction of insects, which in turn reduces the spider population.

5. Seek professional help

If you have a persistent spider problem or are concerned about the presence of venomous spiders, it is advisable to seek professional assistance. Pest control professionals have the expertise and knowledge to properly identify and manage spider infestations. They can assess your situation, recommend appropriate measures, and provide targeted treatments to effectively control spiders while ensuring the safety of your home and family.

In conclusion, while DEET has proven effectiveness as an insect repellent, its effectiveness in repelling spiders is less established. Spiders rely less on olfactory cues and more on other sensory inputs, such as touch and vibration, to navigate their environment. Therefore, alternative methods, such as eliminating food sources and using an integrated pest management approach, may be more effective in reducing spider encounters. If you have persistent problems or concerns about spiders, the best course of action is to contact a professional pest control service.


Does DEET keep spiders away?

No, DEET is not effective in keeping spiders away. DEET is a commonly used insect repellent that is effective against mosquitoes, ticks, and other biting insects, but it has not been proven to repel spiders.

What are some effective ways to keep spiders away?

There are several effective ways to keep spiders away. Some of them include:

  • Keeping your home clean and free of clutter, as spiders are attracted to dark and undisturbed areas.
  • Sealing cracks and gaps in doors, windows, and walls to prevent spiders from entering your home.
  • Removing spider webs and egg sacs regularly.
  • Using natural spider repellents like peppermint oil, vinegar, or citrus sprays.
  • Keeping outdoor lights turned off at night, as they can attract insects that spiders feed on.

Can DEET be used to repel other insects?

Yes, DEET is effective at repelling a wide range of insects, including mosquitoes, ticks, fleas, and biting flies. It works by interfering with the insects’ ability to detect human scent, making it harder for them to find and bite you.

Is DEET safe to use on the skin?

DEET is considered safe for use on the skin when used as directed. However, it is important to follow the instructions on the product label and avoid applying it to open wounds, irritated skin, or near the eyes and mouth. Some people may experience mild skin irritation or allergic reactions to DEET, so it’s advisable to do a patch test before widespread use.

Are there any alternative natural repellents for spiders?

Yes, there are several natural repellents that can be used to deter spiders. Some popular options include:

  • Peppermint oil: Spiders dislike the smell of peppermint oil, so spraying it around windows, doors, and other entry points can help keep them away.
  • Vinegar: A mixture of vinegar and water can be sprayed in areas where spiders are commonly found to deter them.
  • Citrus sprays: Spiders are repelled by the smell of citrus fruits, so using citrus-based sprays or wiping surfaces with citrus peels can be effective.
  • Cedarwood: Cedarwood chips or cedar oil can act as a spider repellent due to their strong scent.
  • Eucalyptus: Spiders are also known to dislike the smell of eucalyptus oil, so using it around your home can help deter them.