Active ingredients and dual biochemical mode of action
Amistar Top pairs two distinct modes of action for synergistic disease suppression.
Chemical breakdown:
- Active ingredient 1: Azoxystrobin 18.2% w/w (QoI / strobilurin class) inhibiting mitochondrial respiration at Complex III, preventing fungal spore germination.
- Active ingredient 2: Difenoconazole 11.4% w/w (DMI / triazole class) inhibiting fungal ergosterol biosynthesis, halting hyphal growth and lesion expansion.
- Systemic mobility: Features translaminar absorption and xylem-directed acropetal movement, shielding untreated new leaves.
- Greening effect: Enhances physiological nitrate reductase activity and delays leaf senescence for improved grain filling.
Target diseases and approved agricultural crops
The combination fungicide is registered under CIBRC for critical agricultural applications.
Key crop-disease targets:
- Rice (Paddy): Highly effective against sheath blight (Rhizoctonia solani) and blast diseases at early tillering and panicle boot stages.
- Chilli: Controls anthracnose (fruit rot / dieback) and powdery mildew.
- Maize: Manages Maydis leaf blight and northern corn leaf blight.
- Adhere strictly to label-recommended dosage rates and dilution volumes; avoid arbitrary concentration spikes.
Integrated disease management and safety precautions
Apply at the earliest sign of disease onset using a hollow cone nozzle for thorough foliage wetting. To avoid fungal resistance development, rotate Amistar Top with contact protectant fungicides (such as mancozeb). Applicators must wear PPE including nitrile gloves, goggles, and face masks.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What active ingredients are present in Amistar Top fungicide?
It contains Azoxystrobin (18.2% w/w) and Difenoconazole (11.4% w/w) formulated as a Suspension Concentrate (SC).
Which major disease does Amistar Top control in paddy?
It is widely used to prevent and cure sheath blight (Rhizoctonia solani) and blast in rice crops.
Why does Amistar Top combine two different active ingredients?
Combining a strobilurin (preventative respiration inhibitor) and a triazole (curative ergosterol inhibitor) widens the disease control spectrum and manages resistance.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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