Pyrethrin is a chemical that has become a popular ingredient in insecticides. It knocks off insects quickly and has a very low toxicity level for humans. It breaks down quickly in the outdoors, so it’s safe to use on ornamental plants and crops.
The chemical is applied through sprays, foggers, and mechanically pressurized equipment. There are a variety of safety precautions associated with pyrethrin applications, including 12-month plant-back intervals and restrictions on its use in sensitive habitats.
The EPA receives up to 6,000 reports a year from people who have been exposed to Pyrethrin. Although many of these reports contain incomplete details, they typically include symptoms such as muscle and skin aches and breathing difficulties. As of 2009, there were more than 50 reported human health problems associated with pyrethroids.
While pyrethrin is highly effective against most insects, it is also toxic to some beneficial insects, such as bees and butterflies. For this reason, you should use pyrethrin only when you need to use it. The best time to apply pyrethrin is early in the morning before the insects are active.
Pyrethrin is available in ready-to-use sprays and as concentrates. The latter must be mixed with water before application. Permethrin is a common ingredient in insect repellents, pet shampoo, and head lice treatments. It’s also used to treat livestock and food-handling facilities. As with many chemicals, pyrethroids are only suitable for commercial use. Some of them have even been banned because of the potential harm to humans.
Although the EPA’s toxicity data show that most incidents are relatively small, the number of people hospitalized from pyrethrin exposure is steadily increasing. In fact, the number of hospital visits is approaching the high level seen during the organophosphate era in the early 1990s.
Pyrethrins are effective against a range of flying and sucking insects. They’re particularly effective against ants, stink bugs, and fleas. While they’re not suitable for organic gardeners, they’re generally safe and effective in the home.
Although pyrethroids have little toxicity on humans, they’re safe for dogs and cats. The WHO classifies them in the fourth category of insecticides. However, there are some precautions that must be followed. They’re used in pest control collars for animals.
Pyrethrins should be labeled with a warning label to protect people and the environment. They’re safe when used according to label directions. However, they do pose a risk when used outside of the home. They’re used for mosquito control and other domestic outdoor uses.
Pyrethrins may also be harmful for humans and can cause allergic reactions. People who have been exposed to these chemicals have reported symptoms such as a runny nose, cough, and difficulty breathing. In addition, people may experience asthma-like symptoms if they’re exposed in large amounts.