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When your lawn comes down with a lawn disease or is starting to grow fungi, it can be very concerning. Mowing or chopping the infected plants will be ineffective because they disease will just come back and continue to spread. It is times like this that you will need a fungicide which is versatile and can tackle a number of different common diseases. One such fungicide which is extremely popular for its versatility is mefenoxam.

On this page we will give you an overview of this fungicide active ingredient and cover how it works so well to eliminate even the hardest to control fungus and disease. Here you can also shop the fungicide products we have in stock which contain mefenoxam. 

What is Mefenoxam?

Mefenoxam (chemical name: methyl N-(methoxyacetyl)-N-(2,6-xylyl)-DL-alaninate), which is also known by the name metalaxyl, is a fungicide active ingredient which is water soluble and is translocated readily from roots to the aerial parts of most plants, but its lateral translocation is slight. With $250-$300 million in annual sales, mefenoxam fungicide is the choice fungicide to protect more than 100 crops.

Mefenoxam is used in mixtures as a foliar spray for tropical and subtropical crops, as a seed or soil treatment for the control of soil-borne pathogens (Pythium, phytophthora) that cause seed and stem rot, damping-off, downy mildew, and other fungus and disease issues. It is used mainly in agricultural settings to provide protection to cucumbers, melons, squash, onions, chives, potatoes, tomatoes, peppers, herbs, eggplant, legumes, garlic, lettuce, a wide range of fruit, nut and vegetable crops.

Ciba-Geigy (now Syngenta Crop Protection) introduced the active ingredient as metalaxyl and first registered it in the US in 1979. It was first approved for use by the Food and Agriculture Organization of the United Nations in 1982, and it requires periodic reviews. Mefenoxam was then registered to the EPA by Syngenta in 1996. 

How Mefenoxam Works

Mefenoxam is a systemic fungicide with protective and curative properties and is absorbed through the leaves, stems and roots. It acts by suppressing sporangial formation, mycelia growth, and the establishment of new infections. 

View our selection of mefenoxam formulated products below. For more information about mefenoxam or other active ingredients in our pesticides, please call us with your questions at 800-479-6583 or email us at askapro@solutionsstores.com.

How is Mefenoxam Used?

Metalaxyl is registered for use on more than 100 agricultural crops, including more than 30 seed treatments. It is primarily used in potatoes, citrus, cotton, onions, cucurbits, tomatoes, tobacco, turfgrass, and in soybeans as a seed treatment. It can also be used on commercial and residential lawns for downy mildew (a foliage disease) and root and crown rot diseases.


Is Mefenoxam Safe To Use?

Mefenoxam is regarded by the EPA as a class III pesticide which means it is only slightly toxic.


When handling or applying any of the chemicals we have in stock, we highly recommended for safety purposes to wear personal protective equipment required to lessen the risks of mefenoxam being inhaled, ingested or coming in contact with the skin. The minimum PPE suggested when working with mefenoxam based products includes chemical resistant gloves, eye protection, and long sleeved clothing. Please make sure to follow the label instructions for the proper directions in applying the product and knowing what safety measures to apply.


To learn more about different fungus issues and lawn diseases and to shop our other fungicide products, visit our disease and fungus control page.

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