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     TX Organic Research Center

 

 

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Mosquito Repellents Natural
 

DEET products are too toxic and should never be used, epecially around children and more especially on their skin. What is effective, non-toxic and recommended is explained below.

Vanilla home remedy for personal use:
8 oz water
2 tsp vanilla extract  
1 tsp. orange oil  
Spray on liberally.
 
 









Some have also recommended Watkins Vanilla hand/body lotion, which is available at Walmart.



Federal officials are recommending two new options other than the chemical DEET to combat mosquitoes:

Picaridin: More pleasant to the skin and doesn't have the odor that DEET repellents have.
(It's a chemical so still not on my recommended list). 

Oil of lemon eucalyptus: A natural ingredient for those who don't like the thought of putting chemicals on their skin. 


Cinnamon oil kills mosquitoes

Cinnamon oil shows promise as a great-smelling, environmentally friendly pesticide, with the ability to kill mosquito larvae, according to a new study published in the July 14 issue of the Journal of Agricultural and Food Chemistry, a peer-reviewed journal of the American Chemical Society, the world's largest scientific society.

The researchers also expect that cinnamon oil could be a good mosquito repellant, though they have not yet tested it against adult mosquitoes.

Besides being a summer nuisance, mosquitoes pose some major public health problems, carrying such deadly agents as malaria, yellow fever and West Nile virus. While conventional pesticide application is often effective in controlling mosquito larvae before they hatch, repeated use of these agents has raised serious environmental and health concerns.

"These problems have highlighted the need for new strategies for mosquito larval control," says Peter Shang-Tzen Chang, a professor in the School of Forestry and Resource Conservation at National Taiwan University and lead author of the paper. Scientists are increasingly turning to more benign natural chemicals to ward off mosquitoes and other pests.

Chang and his coworkers tested eleven compounds in cinnamon leaf oil for their ability to kill emerging larvae of the yellow fever mosquito, Aedes aegypti. "Four compounds - cinnamaldehyde, cinnamyl acetate, eugenol and anethole - exhibited the strongest activity against A. aegypti in 24 hours of testing," Chang says.

Larvicidal activity is judged with a measurement called LC50. "The LC50 value is the concentration that kills 50 percent of mosquito larvae in 24 hours," Chang explains. Lower LC50 translates into higher activity, because it takes a lower concentration to kill larvae in the same amount of time. All four compounds had LC50 values of less than 50 parts per million (ppm), with cinnamaldehyde showing the strongest activity at an LC50 of 29 ppm.

Other common essential oils, such as catnip, have shown similar promise in fighting off mosquitoes, but this is the first time researchers have demonstrated cinnamon's potential as a safe and effective pesticide, according to Chang.

Cinnamaldehyde is the main constituent in cinnamon leaf oil and is used worldwide as a food additive and flavoring agent. A formulation using the compound could be sprayed just like a pesticide, but without the potential for adverse health effects - plus the added bonus of a pleasant smell.

Bark oil from the Cinnamomum cassia tree is the most common source of cinnamaldehyde, but the tree used in this study - indigenous cinnamon, or Cinnamomum osmophloeum - has been of interest to researchers because the constituents of its leaf oil are similar to those of C. cassia bark oil. The leaves of C. osmophloeum, which grows in Taiwan's natural hardwood forests, could be a more economical and sustainable source of cinnamon oil than isolating it from bark, Chang says.

Though the team only tested the oil against the yellow fever mosquito, cinnamon oil should prove similarly lethal to the larvae of other mosquito species, the researchers say. In further studies they plan to test cinnamon oil against other types of mosquitoes as well as different commercial pesticides.

"We think that cinnamon oil might also affect adult mosquitoes by acting as a repellant," Chang says. The researchers haven't yet tested this theory, but they plan to find out in the near future.

The Council of Agriculture of the Executive Yuan, a government agency in Taiwan, provided support for this research.  Jason Gorss



Garlic to chase away Mosquitoes

For site use:
Spray garlic tea over the entire problem area and for even more control broadcast dry minced garlic at 2 - 5 lbs per 1000 sq ft. 


Reader Comment:  Your tip about dried minced garlic is the first thing that has worked for my TERRIBLE mosquito problem in my small backyard. By the way, I found a 23-oz container at Sam's Club for $3.85. I'm going back to stock up. THANK YOU !!!!!

Question:
Recently, a reader said that she had a major mosquito problem in her yard and asked what to do. I believe you suggested that she install a plant-oil misting system. Will such a sprayer system harm beneficial insects and birds or discourage them from entering an area that has been sprayed with pyrethrum? L.R., Dallas

Answer: Pyrethrum sprays and mists would hurt beneficials. That's why I don't recommend them. Plant-oil products such as Bioganics and Eco Exempt will hurt beneficial insects if sprayed too often or in a concentrated form, but they do not harm vertebrates such as frogs, toads, lizards, birds, cats, dogs and humans.

Synthetic and natural forms of pyrethrum are neurotoxins to nonvertebrates and vertebrates. They are especially hard on people with allergies. Children with asthma are the most seriously affected. Pyrethrum, pyrethrins and pyrethroids should not be used. 

Question: What is the small fish that controls mosquitoes, and where can it be obtained? T.C., Arlington

Answer: Gambusia is an effective part of a natural mosquito control program. Most of the garden centers that sell ponds and aquatic plants also sell these fish. 

 


 

Children are at particular risk for subtle brain changes caused by chemicals in the environment, because their skin more readily absorbs them, and chemicals may affect their developing nervous systems, said Abou-Donia.

Preparations like insecticide based lice killing shampoos and insect repellents are assumed to be safe because severe consequences are rare in the medical literature. Yet subtle symptoms, such as muscle weakness, fatigue or memory lapses, might be attributed to other causes in error, Abou-Donia said.

"The take home message is to be safe and cautious when using insecticides," said Abou-Donia. "Never use insect repellents on infants, and be wary of using them on children in general. Never combine insecticides with each other or use them with other medications. Even so simple a drug as an antihistamine could interact with DEET to cause toxic side effects. Don't spray your yard for bugs and then take medications. Until we have more data on potential interactions in humans, safe is better than sorry."


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