Chemical Profile and Biochemical Mode of Action
Fluxapyroxad exhibits unique molecular mobility that allows it to penetrate waxy plant cuticles and distribute through vascular systems.
Key biochemical attributes:
- Chemical class: Pyrazole-4-carboxamide (SDHI fungicide / FRAC Group 7).
- Complex II respiration blocker: Binds to the succinate dehydrogenase enzyme, stopping electron transport and ATP energy production in fungal mitochondria.
- Molecular mobility: Alternates between lipophilic and hydrophilic states, enabling rapid entry through waxy leaves and systematic distribution within plant cells.
- Preventive and curative action: Strong anti-sporulant effect that halts spore germination, germ tube elongation, and mycelial growth.
Approved Target Crops and Disease Spectrum
Fluxapyroxad is registered as a standalone active or in premixes (such as with pyraclostrobin) across diverse crops.
Major registered crop uses:
- Paddy (Rice): Controls sheath blight (Rhizoctonia solani) and false smut, protecting stem culms and developing panicles.
- Soybean: Manages target spot, frogeye leaf spot, and Asian soybean rust, maintaining healthy green canopies during pod filling.
- Pulses (Chickpea and Lentils): Suppresses Ascochyta blight and powdery mildew in winter pulse crops.
- Horticultural fruits and vegetables: Protects tomatoes and apples from early blight and powdery mildew.
Application Guidelines and Resistance Management
Because SDHI fungicides have a single-site mode of action, proactive resistance management is essential.
Application best practices:
- Label dose compliance: Measure strictly per manufacturer package instructions; ensure thorough coverage of both upper and lower leaf surfaces.
- Fungicide rotation: Limit total SDHI applications per season; alternate with multi-site contact protectants like mancozeb or chlorothalonil.
- Preventive timing: Apply at early disease onset before widespread fungal sporulation damages vascular tissues.
- Operator safety: Wear protective gloves, safety glasses, and a face mask during chemical mixing and spraying.
Official source
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Directorate of Plant Protection, Quarantine & Storage ↗Related on KisanPe
Common questions
What chemical class does Fluxapyroxad belong to?
Fluxapyroxad belongs to the pyrazole-4-carboxamide class of succinate dehydrogenase inhibitor (SDHI) systemic fungicides.
How does fluxapyroxad control fungal plant diseases?
It inhibits Complex II in fungal mitochondrial respiration, stopping cellular energy production and preventing spore germination.
Which major diseases does fluxapyroxad manage in rice and soybean?
It manages sheath blight in paddy and Asian rust, target spot, and frogeye leaf spot in soybean crops.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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