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Myclobutanil 10% WP: Systemic Triazole Fungicide Uses

Myclobutanil 10% WP is a broad-spectrum systemic triazole fungicide (FRAC Group 3) operating as a sterol demethylation inhibitor (DMI) in fungal cell membranes. Formulated as a wettable powder, it delivers preventive, curative, and eradicative activity against powdery mildew, apple scab, rust, and leaf spot diseases. Widely used in Indian temperate orchards and commercial horticulture, Myclobutanil translocates acropetally to protect newly expanding leaves and developing fruits.

Last reviewed: 10 November 2026

Active chemical properties and DMI systemic translocation

Myclobutanil provides rapid foliar absorption and acropetal translocation through plant xylem to arrest fungal development.

  • Demethylation inhibitor (DMI, FRAC Group 3): Blocks C14-demethylase enzyme in ergosterol biosynthesis, halting mycelial expansion.
  • Triple action efficacy: Offers preventive protection against spore germination, curative suppression of internal hyphae, and eradicative anti-sporulant action.
  • Acropetal systemic movement: Moves upward into new leaf shoots and fruit buds that emerge after chemical application.
  • Wettable powder (10% WP) formulation: Dilutes readily in water for orchard air-blast and tractor-mounted spraying.

Target crops and major fungal disease spectrum

Myclobutanil 10% WP is approved under CIBRC regulations for managing fungal disease complexes in key fruit and vegetable crops.

  • Apple: Crucial for controlling apple scab (Venturia inaequalis) and powdery mildew during leafing, pink bud, and petal fall stages.
  • Grapes: Broad-spectrum control of powdery mildew (Uncinula necator) on grapevine leaves, shoots, and berry clusters.
  • Chilli: Control of powdery mildew (Leveillula taurica) causing white fungal patches and premature leaf fall.
  • Horticultural fruits and roses: Suppression of rust and black spot diseases.

Application timing, spray calibration, and resistance management

Apply Myclobutanil preventatively at the earliest disease forecast or immediately upon observing initial powdery mildew patches. Use high-pressure orchard sprayers for thorough canopy misting. To prevent triazole resistance, limit applications to two sprays per season and alternate with multi-site contact protectants like Mancozeb or sulfur. Wear protective clothing during spray preparation.

Official source

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Central Insecticides Board and Registration Committee ↗

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Common questions

What is the technical chemical family of Myclobutanil 10% WP?

Myclobutanil belongs to the triazole chemical class (FRAC Group 3) acting as a sterol demethylation inhibitor (DMI).

Which major apple diseases does Myclobutanil control?

It is widely used in apple orchards to control apple scab and powdery mildew during early vegetative and flowering stages.

Does Myclobutanil offer curative disease action?

Yes, Myclobutanil provides both preventative protection and post-infection curative action, halting fungal mycelium already inside plant tissues.

General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.

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