Active ingredient and mode of action
- Contains Azoxystrobin 23% Suspension Concentrate (SC), categorized under FRAC Group 11 (Quinone Outside Inhibitors - QoI).
- Inhibits fungal mitochondrial respiration by blocking electron transfer between cytochrome b and cytochrome c1 at the Qo site.
- Prevents ATP synthesis, arresting fungal spore germination, germ tube growth, and mycelial colonization.
- Demonstrates strong translaminar movement and acropetal translocation through plant xylem vessels.
Target diseases and labeled crops
- Grapes: Downy mildew (Plasmopara viticola) and powdery mildew (Uncinula necator).
- Chillies: Anthracnose / fruit rot (Colletotrichum capsici) and powdery mildew.
- Tomatoes and potatoes: Early blight and late blight.
- Paddy (rice): Sheath blight (Rhizoctonia solani) and blast (Magnaporthe oryzae).
- Imparts physiological benefits, including extended green leaf duration and improved grain or fruit filling.
Resistance management and application guidelines
- Strobilurins carry a high inherent risk of single-site pathogen resistance if used repeatedly.
- Strictly adhere to FRAC guidelines: limit consecutive applications, rotate with fungicides from different FRAC groups (such as triazoles or multi-site contact protectants like mancozeb).
- Follow label dosages and pre-harvest intervals (PHI) approved by the Central Insecticides Board & Registration Committee (CIBRC), wearing standard personal protective gear.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the active ingredient in Amistar fungicide?
It contains Azoxystrobin 23% SC, a strobilurin class systemic fungicide.
Which diseases does Amistar control in horticultural crops?
It controls downy mildew and powdery mildew in grapes, anthracnose in chillies, and early/late blights in solanaceous crops.
Why should Amistar be rotated with other fungicides?
Rotating with different fungicide chemical classes prevents fungal pathogens from developing single-site QoI resistance.
What physiological benefit does Azoxystrobin provide to crops?
It delays senescence (greening effect) and enhances nitrate assimilation, contributing to better crop vigor and quality.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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