AMISTAR TOP FUNGICIDE
- APVMA no.
- 63898
- Registrant
- SYNGENTA AUSTRALIA PTY LTD
- Formulation
- SUSPENSION CONCENTRATE
AMISTAR TOP FUNGICIDE is a suspension concentrate fungicide containing the active constituents azoxystrobin (200 g/L) and difenoconazole (125 g/L). Designed for Australian horticultural management, it provides broad-spectrum disease control by combining two distinct systemic active ingredients for use across field and protected cropping situations.
Incorporating both active constituents into a single product offers growers both preventative protection against spore germination and early curative activity against established fungal pathogens. This dual-action capability makes it an ideal fit in structured crop protection programmes ahead of key disease windows or canopy closure.
From the warm vegetable districts of Bowen and Bundaberg to southern growing regions, maintaining disease-free foliage is critical to yield and quality. AMISTAR TOP FUNGICIDE fits into preventative spray schedules to help growers manage leaf canopy health effectively.
Active constituents
- AZOXYSTROBIN200 g/L
- DIFENOCONAZOLE125 g/L
Registered uses
| Crop | Pest or disease |
|---|---|
| Tomato | Powdery mildew |
Withholding period
WHP: Carrots Potatoes: DO NOT HARVEST FOR 7 DAYS AFTER APPLICATION Tomatoes: DO NOT HARVEST FOR 3 DAYS AFTER APPLICATION
The registered withholding period requirements specify that carrots and potatoes must not be harvested for 7 days after application. Tomatoes must not be harvested for 3 days after application. Always log application dates and crop details in your farm spray diary to ensure full compliance prior to harvest.
Mode of action
AMISTAR TOP FUNGICIDE combines two active constituents with complementary modes of action. Azoxystrobin is a strobilurin belonging to FRAC Group 11 (quinone outside inhibitors), which inhibits fungal mitochondrial respiration and prevents spore germination. Difenoconazole is a triazole belonging to FRAC Group 3 (demethylation inhibitors), which disrupts ergosterol biosynthesis in fungal cell membranes, stopping active hyphal growth. Together, they deliver both preventative leaf surface protection and systemic translaminar movement within crop tissues.
Resistance management
To delay the development of fungal resistance to FRAC Group 11 and FRAC Group 3 fungicides, do not rely solely on AMISTAR TOP FUNGICIDE. Integrate sound cultural control measures and rotate applications with effective fungicides from different resistance groups (non-Group 11 and non-Group 3). Avoid consecutive applications of strobilurin or triazole fungicides beyond local CropLife Australia resistance management guidelines. Consult the approved product label for specific seasonal application limits and rotation strategies.
Tank-mix compatibility
As a suspension concentrate formulation, physical compatibility must be verified before large-scale paddock mixing. Perform a jar test using the intended water source, mixing ratio, and tank-mix partners. Caution is advised when tank-mixing with crop oils or certain emulsifiable concentrate formulations under high ambient temperatures or plant stress, as leaf scorch or phytotoxicity can occur. Always consult the approved product label for mandatory mixing orders and compatibility restrictions.
Handling and environment
Operators must read and follow all safety directions, personal protective equipment (PPE) requirements, and re-entry statements specified on the APVMA-approved product label. Take standard precaution to avoid spray drift onto non-target areas, waterbodies, or adjacent crops. Refer to the product safety data sheet (SDS) and approved label for full environmental hazard warnings and storage guidelines.
Common questions
- When is the best time to apply AMISTAR TOP in a crop protection schedule?
- It is most effectively applied preventatively, prior to visible disease establishment or at the very early signs of infection when environmental conditions favour disease development.
- Why does this product contain two different active constituents?
- Combining azoxystrobin (FRAC Group 11) and difenoconazole (FRAC Group 3) delivers dual-site activity, pairing preventative surface activity with systemic movement while assisting with resistance management.
- How do I determine the correct application rate and spray volume for my crop?
- Application rates, spray volumes, and equipment settings vary according to crop growth stage and canopy density. Always check the registered-use instructions on the APVMA-approved product label.
- Can I mix AMISTAR TOP with spray oils or additives?
- Tank-mixing with oils or certain additives can increase the risk of leaf burn under hot or high-radiation conditions. Check the label directions and perform a jar test prior to mixing.
- How do I check harvest withholding periods before spraying?
- Review the specific WHP text on the approved label for your crop, and cross-reference the required harvest interval against your planned harvest date in your farm spray diary.