Here is a detailed summary of Amistar Top (500 mL) by Syngenta — what it is, how it works, and how it’s used.
Amistar Top is a fungicide formulated as a Suspension Concentrate (SC) that combines two active ingredients:
Azoxystrobin (a strobilurin class fungicide, FRAC Group 11)
Difenoconazole (a triazole class fungicide, FRAC Group 3)
Typical composition (in some markets) is Azoxystrobin ~18.2% + Difenoconazole ~11.4% in the SC formulation.
It is marketed in a 500 mL pack size (among others) for use by growers.
The dual-mode combination gives broad-spectrum protection: preventive (before infection), systemic (inside the plant), and curative (after initial infection) activity.
Azoxystrobin acts by inhibiting fungal respiration (blocking electron transport in mitochondrial complex III) in pathogens.
Difenoconazole inhibits ergosterol biosynthesis (a critical component of fungal cell membranes) which effectively stops fungal growth.
The product shows translaminar movement (penetration through the leaf from one surface to the other) and xylem/systemic movement (inside plant tissues) which helps reach and protect hidden disease sites.
Amistar Top is used for many crops: rice, cotton, wheat, maize, vegetables (tomato, chilli, onion), sugarcane, etc.
It targets a wide range of fungal diseases: yellow rust, powdery mildew, late blight, sheath blight, leaf spots, grey mildew, etc.
Example: On potatoes, used for early blight, brown spot, black dot; on cereals for rusts and mildews.
Read and follow the label fully (it’s a legal requirement in many jurisdictions).
Typical dosage in some markets: 200 mL of product per acre (or defined area) depending on crop and disease pressure.
Spray using appropriate volume of water and ensure good canopy coverage (especially leaf undersides).
Use protective equipment: long-sleeved shirt, long-pants, waterproof gloves, eye protection.
Observe pre-harvest intervals (PHI) and re-entry intervals (REI) as required by the local label. E.g., on one label the REI is 12 hours.
Storage: in cool, dry, well-ventilated place; keep out of reach of children; avoid contamination of water bodies.
It is harmful if swallowed or inhaled and may cause skin or eye irritation. Avoid drift into water bodies; toxic to aquatic life.
Important for resistance management: because it combines two modes of action (FRAC Groups 11 & 3) it helps reduce risk of fungal resistance. But still, rotation with other fungicide classes and good agronomic practice is important.
Do not exceed the number of applications per season as specified on the label. E.g., some labels state only up to two applications per season.
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