Active chemical nature and biochemical mode of action
Fujione contains Isoprothiolane 40% EC (emulsifiable concentrate), an active compound belonging to the dithiolane chemical class (FRAC Group 6).
It works by specifically inhibiting phospholipid biosynthesis in fungal cell membranes, preventing fungal infection pegs from penetrating rice epidermal tissues. Inside the plant, it translocates acropetally via xylem sap to protect newly emerging foliage and panicle necks.
- Active chemical: Isoprothiolane 40% EC.
- FRAC classification: Group 6 (Inhibitor of phospholipid biosynthesis).
- Insect suppression: Concurrently reduces feeding by sap-sucking planthoppers (BPH) and leafhoppers in rice canopies.
- Systemic acropetal mobility: Absorbed rapidly through roots and foliage, moving upward to shield panicle necks from fungal rot.
Target blast disease phases in paddy cultivation
Rice blast (Pyricularia oryzae) attacks rice crops at multiple developmental stages, causing catastrophic grain sterility and lodging if unmanaged.
Fujione provides dependable disease suppression across all three critical blast phases.
- Leaf blast: Prevents and cures eye-shaped spindle lesions on vegetative leaves.
- Nodal blast: Shields stem nodes from turning black and snapping during vegetative development.
- Neck blast: Protects the fragile panicle neck during heading, preventing empty, chaffy white panicles and lodging.
Application timing, spray techniques, and safety
To control leaf blast, spray upon the first appearance of spindle-shaped lesions during cool, humid, and overcast weather.
To protect against destructive neck blast, apply preventively at boot leaf stage and 5% panicle emergence.
Ensure uniform foliar coverage using calibrated knapsack sprayers operated at container label recommended dilution rates.
- Spray timing for neck blast: Crucial application at late booting and early panicle heading before grain filling.
- Water volume: Use sufficient clean water (500 liters per hectare) for complete canopy wetting.
- Protective measures: Wear protective overalls, rubber gloves, and face shield; observe statutory pre-harvest intervals.
Official source
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ICAR - National Rice Research Institute ↗Related on KisanPe
Common questions
What is the active ingredient in Fujione fungicide?
Fujione contains Isoprothiolane 40% EC, a specialized systemic fungicide for rice blast control.
When is the most critical time to spray Fujione against neck blast?
Spray at the boot leaf stage and repeat at 5% panicle emergence to safeguard emerging panicle necks.
Does Fujione have any secondary effect on insect pests?
Yes, Isoprothiolane exhibits mild anti-feedant activity against sap-sucking rice planthoppers like BPH.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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