Chemical Profile and Mode of Action
Belonging to the Quinone Outside Inhibitor (QoI) class (FRAC Group 11), kresoxim-methyl binds to cytochrome b, shutting down ATP synthesis in fungal cells.
Without cellular energy, spore germination, germ tube elongation, and appressorium formation are halted within minutes of exposure.
- Chemical Class: Strobilurin derivative modeled after natural fungicidal metabolites of Strobilurus tenacellus
- Redistribution: Surface translaminar movement with vapor-phase redistribution across micro-canopies
- Greening Effect: Enhances physiological nitrate reductase activity, promoting healthy green leaf retention
Crops and Target Fungal Diseases
Kresoxim-methyl 44.3% SC is widely registered for high-value horticultural crops and staples where fungal blights destroy leaf surface area.
It is a leading standard for managing Venturia inaequalis (apple scab) in temperate regions and Erysiphe cichoracearum (powdery mildew) in cucurbits.
- Apple: Apple scab and powdery mildew control from green tip through petal fall
- Grapes and Cucurbits: Downy mildew and powdery mildew mitigation
- Paddy: Sheath blight and blast management under high moisture conditions
Anti-Resistance Management Strategies
Because single-site QoI fungicides carry a recognized risk of fungal target-site mutations (such as G143A), prudent stewardship is essential.
Do not apply kresoxim-methyl in more than two consecutive sprays, and alternate with multi-site protective fungicides like mancozeb or chlorothalonil.
- Spray Interval: Maintain recommended spray intervals based on official local extension advisories
- Tank Mixing: Can be partnered with compatible protective contact fungicides to broaden spectrum
- Phytotoxicity: Non-phytotoxic when used at recommended CIBRC label rates on designated crop cultivars
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the primary disease controlled by kresoxim-methyl 44.3% SC?
It is widely used to control apple scab, powdery mildew, and paddy sheath blight.
Does kresoxim-methyl have translaminar action?
Yes, it penetrates leaf cuticles and redistributes across both leaf surfaces via translaminar and vapor diffusion.
How many sprays of kresoxim-methyl are recommended per season?
Agricultural guidelines recommend limiting strobilurin applications to two per season to safeguard against fungal resistance.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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