Strobilurin QoI Chemistry and Vapor Action
Kresoxim-methyl belongs to the quinone outside inhibitor (QoI) class (FRAC Group 11). It blocks electron transfer at the cytochrome bc1 complex in fungal mitochondrial membranes, halting ATP energy production and stopping spore germination.
A distinctive feature of Ergon is its 'vapor-phase redistribution'—after spray deposits dry, active chemical molecules continuously vaporize and re-deposit across unsprayed adjacent leaf surfaces, protecting dense canopies.
- Grapevines: Powdery mildew (Uncinula necator) and anthracnose.
- Apple: Apple scab (Venturia inaequalis) and powdery mildew.
- Vegetables: Powdery mildew and blights in chillies and cucurbits.
- Physiological greening: Enhances nitrate assimilation and prolongs green leaf area, improving fruit sizing and quality.
- Rainfastness: Binds tightly to waxy leaf cuticles, providing high resistance to wash-off from monsoon rain showers.
Application Guidelines and Resistance Stewardship
For optimum crop protection, apply Ergon preventatively at early disease initiation or during critical flower bud and fruit set phases.
Rotating with fungicides having alternative modes of action (such as DMI triazoles or multi-site protectants) preserves long-term chemical efficacy.
- Calibrate spray equipment to ensure uniform droplet deposition using hollow cone nozzles.
- Observe the registered pre-harvest intervals (PHI) to comply with maximum residue limits.
- Wear personal protective gear including gloves, goggles, and a protective mask during measuring and spraying.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active ingredient in Ergon fungicide?
Ergon contains Kresoxim-methyl 44.3% SC, a broad-spectrum strobilurin QoI fungicide.
What is vapor-phase redistribution in Ergon?
It means the chemical partially evaporates from treated leaf surfaces and re-deposits on untreated adjacent leaves, extending protective coverage.
Which crop diseases are primarily controlled by Ergon?
It is widely used to manage powdery mildew in grapes, apple scab, and foliar blights in vegetables and fruit crops.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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