Dual Chemistry and Cellular Respiration Targets
Signum synergizes Boscalid (an SDHI/carboxamide active) with Pyraclostrobin (a strobilurin/QoI active) in water-dispersible granules.
By concurrently inhibiting mitochondrial Complex II (via Boscalid) and Complex III (via Pyraclostrobin), it delivers an unprecedented multi-stage block on fungal energy metabolism.
This dual inhibition provides exceptional preventive control alongside curative suppression of incubating mycelia.
- Boscalid (25.2%): SDHI inhibitor blocking succinate dehydrogenase in mitochondrial Complex II
- Pyraclostrobin (12.8%): Strobilurin blocking cytochrome bc1 in mitochondrial Complex III
- Dual translocation: Combines acropetal systemic mobility with translaminar leaf redistribution
Approved Crops and Disease Spectrum
Signum is registered for high-value horticultural crops including grapes, tomatoes, chilies, and onion crops.
It provides exceptional control against aggressive fruit rot, leaf blight, and purple blotch complexes.
- Grapes: Controls powdery mildew and black rot while improving berry firmness and shelf life
- Onion: Highly effective against purple blotch (Alternaria porri) and Stemphylium blight
- Tomato and chili: Controls early blight, powdery mildew, and anthracnose fruit lesions
Application Guidelines, Mixing, and Safety
Dissolve granules directly in the spray tank under mild agitation to produce a uniform suspension.
Apply preventively before disease establishment, ensuring thorough wetting of developing flowers, fruit bunches, and foliage.
Observe recommended pre-harvest waiting periods and store containers in dry, child-safe locations.
- Preventive timing: Apply ahead of anticipated rainy weather or humid conditions
- Canopy penetration: Ensure complete coverage of inner canopies and dense foliage
- Safety protocols: Wear protective gloves, protective clothing, and eye goggles during preparation
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What chemicals are present in BASF Signum fungicide?
Signum contains Boscalid 25.2% + Pyraclostrobin 12.8% WG in a water-dispersible granule formulation.
How does Signum deliver dual-site mitochondrial inhibition?
Boscalid inhibits Complex II (SDHI) while Pyraclostrobin inhibits Complex III (QoI), shutting down fungal cellular respiration.
Does Signum control purple blotch in onions?
Yes, Signum is registered and widely recognized for outstanding control of purple blotch and Stemphylium blight in onions.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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