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You work hard to take care of your lawn turf and plants, so it can be very frustrating to see that powdery mildew is starting to muck up the lively greens. Powdery mildew can be an agitating fungus that grows on plants depending on the conditions and caretaking methods of the owner, but there are plenty of other fungal growths that can also be problematic. Luckily, there is a great fungicide active ingredient that can successfully eliminate powdery mildew and other plants which we highly recommend called myclobutanil.

On this page we want to share with you some background on myclobutanil, its origin and why it works so well to eliminate fungi and disease. Here you can also shop the fungicide products we have in stock which contain myclobutanil.

What is Myclobutanil?

Myclobutanil is a broad spectrum fungicide registered for use on a wide variety of agricultural crops. Myclobutanil is a fungicide of the conazole class called triazoles. It is most notably used in California on table grapes, wine, strawberries, and almond crops. It is also regularly used in greenhouses, landscaping, residential and commercial turf, and public right of way areas.

Myclobutanil was registered by the EPA in 2006 by Dow AgroSciences LLC, a wholly owned subsidiary of The Dow Chemical Company.In its original form, Myclobutanil is a light yellow solid with a sulfur-like odor. It can come in a number of formulations including but not limited to liquid emulsion, powder, or granular fungicides.

How Does Myclobutanil Work?

Myclobutanil’s mode of action is the inhibition of the biosynthesis of ergosterol, a vital element of fungal cell membranes. Myclobutanil as a triazole fungicide hinders the enzyme from producing ergosterol, a sterol. This sterol is needed for membrane function and structure. Without ergosterol, the cell walls break down, resulting in abnormal fungal growth and eventual death. If these membranes are unable to grow, the growth of the fungus is inhibited as well.

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

How Is Myclobutanil Used?

Myclobutanil is used to control a diverse range of economically important plant pathogens including powdery mildews, dollar spot, summer patch, brown patch, rusts, and scab in a range of crops including established turf grasses, landscape ornamentals, greenhouse and nursery ornamentals, apple trees, stone fruit trees, almonds, strawberries, vegetables, soybeans and grape vines.


Nearly half of all Myclobutanil use is accounted for by the state of California in its wine as well as table grape vineyards, strawberry, and almond crops.


How Safe Is Myclobutanil?

Myclobutanil is on the low side when it comes to toxicity. Myclobutanil is nonvolatile and has low mobility in soil. If released into a soil environment, it would remain in soil. If released into water, it would adsorb to suspended solids or sediment.


Myclobutanil is highly toxic to aquatic organisms on an acute basis (LC/EC50 between 0.1 and 1 mg/L in the most sensitive species tested). Myclobutanil is practically nontoxic to birds on a dietary basis (LC50>5000ppm), but is slightly toxic to birds on an acute basis (LD50 between 501 and 2000 mg/kg).


Eye contact with myclobutanil may cause moderate irritation. Brief skin contact is essentially nonirritating and is unlikely to result in absorption of harmful amounts or an allergic response. When handling myclobutanil we recommend carefully following safety procedures found on the label directions and wearing the proper protective equipment (long sleeve clothing, gloves, breathing mask and protective eyewear).

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