Mosquito Repellents by Wizzie Brown


Protect yourself with the proper mosquito repellents

Mosquitoes are out in masses and since they are capable of disease transmission, it is important that you protect yourself when spending time outside. Of course, you can wear long pants and a long-sleeved shirt in light colors to reduce the number of mosquitoes that can reach your skin when outside, but this is not always the option people choose with temperatures on the rise. Another option to protect yourself is mosquito repellent.

How to Properly Apply Mosquito Repellent

Apply repellent only to clothing and exposed skin; do not apply repellent underneath clothing! If you want to apply repellent to your face, spray your hands with repellent and rub it onto your face. Do not spray repellent directly into your face or near eyes or mouth. Make sure to apply repellent outdoors. Do not allow children to handle repellents and seek advice from a physician regarding insect repellent use for children under two years of age. Wash hands before eating, smoking, or using the restroom.

Look For These Active Ingredients

To reduce disease transmission from mosquitoes, the Center for Disease Control (CDC) recommends using a product registered with the EPA (Environmental Protection Agency) containing one of the following active ingredients: DEET, picaridin, IR3535, oil of lemon eucalyptus (OLE), para-methane-diol (PMD), or 2-undecanone.


DEET, also known N, N-diethyl-m-toluamide or N, N-diemethylbenzamide, was developed by the U.S. Army in 1946 to protect soldiers in insect-infested areas. Pesticides containing DEET have been used by the public since 1957. Do not use DEET products on children younger than 2 months of age (read the label and check with your pediatrician if you have questions). DEET has a slight odor and may have a greasy feel to some people. It may damage plastic, rubber, vinyl, or synthetic fabrics. DEET may be irritating to the eyes and skin for some people and comes in a wide variety of concentrations, so choose one that will work best for your situation.


First made in the 1980’s, Picaridin resembles a natural compound called piperine (found in plants used to produce black pepper). It has been used in Europe and Australia for many years but has only been in the U.S. since 2005. Picaridin is non-greasy and odorless.


IR-3535, or 3-[N-Butyl-N- acetyl]-aminopropionic acid, ethyl ester, was developed in the mid- 1970’s and became registered for use in the U.S. in 1999. It is registered as a biopesticide by the EPA because it is functionally identical to a naturally occurring substance (an amino acid). It may dissolve or damage plastics and may be irritating to the eyes.

Oil of lemon eucalyptus (OLE) and PMD

Oil of lemon eucalyptus (OLE) and PMD (para-menthane-3,8-diol) are essentially the same thing; PMD is the synthesized (lab created) version of oil of lemon eucalyptus. “Pure” or “essential” oil of lemon eucalyptus is not labeled as a repellent and has not undergone testing and should not be used as a repellent product. OLE/PMD has been on the market in the U.S. since 2002. Do not use OLE/PMD products on children younger than 3 years of age. The natural product (OLE) has known allergens within it while the synthetic version (PMD) has less of a risk to allergens. This product is classified as a biopesticide. OLE/PMD has a varying range of residual, some offering about 20 minutes of protection while other products may last up to two hours.

2-undecanone (AKA methyl nonyl ketone or IBI-246)

The product 2-undecanone is also known as methyl nonyl ketone or IBI-246. It is a colorless oil that can either be produced synthetically or extracted from plants such as rue, cloves, ginger, strawberries, or wild grown tomatoes. This product is fairly new to consumers.

How Long Will it Last?

Many factors play into how long a repellent will last for a person. Some of these are:

  • The concentration (or percent of active ingredient) of the product. You can find the percentage on the product label.
  • Person’s attractiveness. Some people are more attractive to mosquitoes than others (and no scientific research has proven that it is because of eating garlic, taking vitamin B, using tobacco products, etc.). A person’s genetic code plays a large part on what makes a person so attractive to mosquitoes.
  • Frequency and uniformity of application. In other words, how often is the repellent applied and how good of coverage did you get?
  • Activity level of the person. The more active the person is, the more sweat they produce which can cause the repellent to wash off the surface of the skin.

Word of Caution about Product Combinations

As a word of caution, there are products that combine sunscreen and insect repellent. The CDC recommends that if you need sunscreen and repellent, that you choose two separate products. Reapply sunscreen more often than repellents.

For more information or help with identification, contact Wizzie Brown, Texas AgriLife Extension Service Program Specialist at 512.854.9600. Check out her blog at

This work is supported by Crops Protection and Pest Management Competitive Grants Program [grant no. 2017-70006-27188 /project accession no. 1013905] from the USDA National Institute of Food and Agriculture.

The information given herein is for educational purposes only. Reference to commercial products or trade names is made with the understanding that no discrimination is intended and no endorsement by Texas A&M AgriLife Extension Service or the Texas A&M AgriLife Research is implied.
The Texas A&M AgriLife Extension Service provides equal access in its programs, activities, education and employment, without regard to race, color, sex, religion, national origin, disability, age, genetic information, veteran status, sexual orientation or gender identity.

Additional Resources

Urban IPM – Blog by Wizzie Brown

Integrated Pest Management

Insects in the City

About Wizzie

Wizzie Brown

Wizzie Brown
County Extension Program Specialist – Integrated Pest Management

Wizzie has been with Texas A&M AgriLife Extension Service since 2002 and has been playing with insects since she was a toddler. She is an Extension Program Specialist with the Integrated Pest Management (IPM) program. Wizzie holds a B.S. in entomology from The Ohio State University and a M.S. in entomology from Texas A&M University. The integrated pest management program provides identification, biological and management information to whomever needs help. Wizzie’s research focuses on imported fire ants, including community wide fire ant management. Wizzie also is happy to provide programs to area groups on a variety of arthropod-related topics. You can find insect and other arthropod information on Wizzie’s blog.

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