Active Ingredient Profile and Strobilurin Action
Amistar features Azoxystrobin (23% SC), derived naturally from wood-decaying mushrooms (Strobilurus tenacellus).
It binds to the quinone outside (Qo) site of cytochrome b in mitochondrial Complex III, halting fungal cellular respiration and stopping ATP energy synthesis.
This inhibits spore germination, zoospore motility, and early mycelial expansion across plant foliage.
- Formulation: 23 percent Suspension Concentrate (SC)
- Systemic mobility: Systemic xylem transport combines with translaminar leaf movement for full canopy protection
- Preventive excellence: Most powerful when applied ahead of infection or during initial symptom appearance
Target Diseases and Approved Crop Applications
Amistar is registered across diverse field cereals, fruits, pulses, and commercial vegetables.
Beyond disease prevention, it delivers recognized physiological greening effects that support extended leaf photosynthesis and grain filling.
- Paddy: Controls blast (Pyricularia oryzae) and sheath blight (Rhizoctonia solani)
- Grapes and vegetables: Controls powdery mildew, downy mildew, and anthracnose
- Tomato and chili: Manages early blight and fruit rot complexes
Dosage Guidelines, Mixing, and Resistance Management
Applicators must follow dosage recommendations printed on the CIBRC-approved product leaflet for their specific crop.
To prevent resistance, do not exceed the recommended number of consecutive strobilurin sprays and alternate with multi-site contact protectants like Mancozeb.
- Spray timing: Apply early in the morning with high-volume knapsack or boom sprayers
- Nozzle type: Use hollow cone nozzles for fine foliar atomization and thorough underside coverage
- Resistance rotation: Rotate with contact protectants or triazole fungicides across the cropping cycle
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active chemical in Syngenta Amistar?
Amistar contains Azoxystrobin 23% SC, a broad-spectrum systemic strobilurin fungicide.
Does Amistar provide plant health benefits?
Yes, Azoxystrobin optimizes nitrate assimilation and reduces ethylene stress, maintaining green leaf area for higher crop yields.
Can Amistar be sprayed on apple trees?
Caution is advised because certain apple varieties (such as McIntosh) are sensitive to azoxystrobin spray drift; verify label warnings.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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