Active Ingredient Chemistry and Mode of Action
Amistar belongs to the strobilurin chemical class inspired by natural wood-decaying mushrooms.
Key biochemical attributes:
- Active ingredient: Azoxystrobin formulated as a suspension concentrate at 23% SC concentration.
- Complex III respiration inhibitor: Binds to the Qo site of cytochrome b in fungal mitochondria, blocking ATP energy synthesis.
- Translaminar and systemic mobility: Absorbed rapidly by leaf cuticles and redistributed within plant tissues to protect unsprayed leaves.
- Anti-sporulant efficacy: Prevents spore germination, zoospore motility, and sporulation on treated plant canopies.
Target Crops and Registered Disease Spectrum
Azoxystrobin is registered under CIBRC guidelines across key field, commercial, and fruit crops.
Major registered crop uses:
- Paddy (Rice): Controls blast (Pyricularia oryzae) and sheath blight (Rhizoctonia solani), keeping flag leaves clean.
- Chilli: Controls anthracnose fruit rot and powdery mildew, safeguarding pod quality and color.
- Tomato and Potato: Provides strong preventive protection against early blight and late blight.
- Grapes: Shields vine canopies against downy mildew and powdery mildew during humid vegetative stages.
Application Guidelines and Resistance Management
Applying strobilurin fungicides responsibly ensures long-term field efficacy against evolving fungal strains.
Application best practices:
- Preventive application: Apply before disease symptoms become severe or at first visual appearance of lesions.
- Fungicide rotation: Alternate azoxystrobin with fungicides having different modes of action (such as triazoles or multi-site contact chemicals).
- Label dose compliance: Measure strictly according to package instructions using clean water and hollow cone nozzles.
- Protective equipment: Wear chemical-resistant gloves, goggles, and protective clothing during spray tank preparation.
Official source
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Directorate of Plant Protection, Quarantine & Storage ↗Related on KisanPe
Common questions
What is the active chemical ingredient in Amistar by Syngenta?
Amistar contains Azoxystrobin 23% SC, a broad-spectrum systemic strobilurin fungicide.
What is meant by the 'green effect' of Amistar?
Azoxystrobin enhances nitrate reductase activity and delays leaf senescence, keeping foliage greener and supporting better grain filling.
Which major diseases does Amistar control in rice and chilli?
It controls blast and sheath blight in rice, and anthracnose fruit rot and powdery mildew in chilli crops.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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