Methomyl

From WikiMD's Wellness Encyclopedia

Methomyl is a broad-spectrum insecticide known for its quick knockdown effect on a variety of insect pests. It is a carbamate insecticide, which means it works by inhibiting acetylcholinesterase, an enzyme essential for the proper functioning of the nervous systems of insects. This inhibition leads to the accumulation of acetylcholine in the synapse, causing continuous nerve impulse transmission, paralysis, and eventually the death of the pest. Methomyl is used in agriculture to protect crops from insects that can cause significant damage to produce.

Chemical Properties[edit | edit source]

Methomyl is chemically known as S-methyl N-[(methylcarbamoyl)oxy]thioacetimidate. It has a molecular formula of C5H10N2O2S. Methomyl is highly soluble in water, which facilitates its application as a spray but also raises concerns about its potential for water contamination. It is volatile and has a relatively low persistence in the environment, breaking down under both alkaline and acidic conditions.

Usage[edit | edit source]

Methomyl is applied in various forms, including granules, wettable powders, and soluble concentrates. It is used on a wide range of crops such as cotton, soybeans, corn, and vegetables to control insects like aphids, thrips, and mites. Due to its high toxicity to insects and rapid action, it is a valuable tool for farmers in managing pest populations and preventing crop damage.

Health and Safety[edit | edit source]

The use of methomyl poses significant health risks to humans and non-target organisms. It is classified as highly toxic by ingestion, inhalation, or dermal absorption. Symptoms of methomyl poisoning are similar to those of other carbamate poisonings, including headache, nausea, dizziness, and in severe cases, respiratory depression, convulsions, and death. Proper safety measures, including the use of personal protective equipment (PPE), are essential when handling methomyl.

Environmental Impact[edit | edit source]

Methomyl is toxic to aquatic organisms and birds, and its use can have detrimental effects on non-target species. Its high solubility in water and potential for runoff raise concerns about water contamination and the impact on aquatic ecosystems. The volatility of methomyl also poses a risk of air contamination. However, its relatively rapid degradation in the environment reduces the risk of long-term environmental accumulation.

Regulation[edit | edit source]

The use of methomyl is regulated in many countries to minimize its health and environmental impacts. Regulations may include restrictions on its application rates, the timing of applications, and the crops on which it can be used. Users are required to follow label instructions carefully to ensure safe and effective use of the product.

Conclusion[edit | edit source]

Methomyl is an effective insecticide for managing a variety of pests in agricultural settings. However, its toxicity to humans and non-target organisms necessitates careful handling and adherence to regulatory guidelines to mitigate health and environmental risks.

WikiMD
Navigation: Wellness - Encyclopedia - Health topics - Disease Index‏‎ - Drugs - World Directory - Gray's Anatomy - Keto diet - Recipes

Search WikiMD

Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro / Zepbound) available.
Advertise on WikiMD

WikiMD's Wellness Encyclopedia

Let Food Be Thy Medicine
Medicine Thy Food - Hippocrates

Medical Disclaimer: WikiMD is not a substitute for professional medical advice. The information on WikiMD is provided as an information resource only, may be incorrect, outdated or misleading, and is not to be used or relied on for any diagnostic or treatment purposes. Please consult your health care provider before making any healthcare decisions or for guidance about a specific medical condition. WikiMD expressly disclaims responsibility, and shall have no liability, for any damages, loss, injury, or liability whatsoever suffered as a result of your reliance on the information contained in this site. By visiting this site you agree to the foregoing terms and conditions, which may from time to time be changed or supplemented by WikiMD. If you do not agree to the foregoing terms and conditions, you should not enter or use this site. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.

Contributors: Prab R. Tumpati, MD