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Amistar Top (Azoxystrobin + Difenoconazole)

Amistar Top is a Syngenta systemic fungicide pre-mix of azoxystrobin 18.2% and difenoconazole 11.4% formulated as SC. It is CIBRC-labelled for chilli, tomato, paddy and maize against a broad spectrum of foliar and fruit diseases.

Composition / Active ingredient

  • Composition: Azoxystrobin 18.2% + Difenoconazole 11.4% SC
  • Chemical classes: Strobilurin (methoxyacrylate QoI) + Triazole (DMI)

Mode of action

The mixture combines two unrelated systemic modes:

  • Azoxystrobin inhibits mitochondrial respiration at the cytochrome bc1 complex (Qo site), blocking ATP production. It is highly active against spore germination. FRAC group 11 (QoI).
  • Difenoconazole inhibits C14-α-demethylase (CYP51), disrupting ergosterol biosynthesis and fungal membrane integrity. FRAC group 3 (DMI).

Together, the two provide protective, curative and translaminar action.

Target use and dose

Amistar Top controls anthracnose, fruit rot, leaf spot, rust and powdery mildew in chilli; early blight on tomato; blast and sheath blight on paddy; and Cercospora/turcicum leaf spots on maize. The standard dose is 200 ml/acre in 200 L water, applied as a preventive or early-curative spray.

Safety and regulatory status

Strobilurin resistance has been documented globally in several pathogens; rotation with non-QoI fungicides such as Mancozeb Carbendazim Saaf or Zineb Hexaconazole Avtar is recommended. Standard pre-harvest intervals on label must be observed, particularly on chilli for export.

See also: Nativo Fungicide, Cabrio Top, Picoxystrobin Tricyclazole Galileo Sensa, Zineb Hexaconazole Avtar.

References

  1. Amistar Top. Syngenta.
  2. Amistar Top Fungicide. BigHaat.