Active chemical class and mesoionic mode of action
- Novel mesoionic chemistry: Active ingredient Triflumezopyrim belongs to IRAC Group 4E, binding distinctively to insect nicotinic acetylcholine receptors (nAChR).
- Immediate feeding cessation: Paralyzes hopper nervous systems within hours, halting sap feeding and preventing hopper-burn damage.
- Broad hopper coverage: Controls both Brown Plant Hopper (Nilaparvata lugens) and Whitebacked Planthopper (Sogatella furcifera) at all post-embryonic stages (nymphs and adults).
- Extended residual control: Delivers up to 21 days of hopper suppression, protecting paddy tillers through sensitive reproductive phases.
Paddy application window and spraying technique
Apply at the early hopper build-up stage (typically 30 to 45 days after transplanting or when field scouting shows 5 to 10 hoppers per hill). Ensure the spray wand is directed down into the lower canopy and base of the rice tillers where hoppers congregate and feed on plant sap.
Dosage, water volume and environmental safety
- Follow approved label dosage strictly (typically 94 ml per acre); dilute in 200 liters of water per acre for thorough canopy penetration.
- Favorable safety profile toward key natural predators of hoppers, including wolf spiders, mirid bugs, and damselflies.
- Observe the mandatory Pre-Harvest Interval (PHI) printed on the container label before harvest.
Official source
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Directorate of Plant Protection, Quarantine & Storage (CIBRC) ↗Related on KisanPe
Common questions
What is the active chemical ingredient in Pexalon?
Pexalon contains Triflumezopyrim at 10% concentration formulated as a Suspension Concentrate (10% SC).
How does Pexalon protect rice fields from hopper-burn?
It paralyzes planthoppers within hours, stops sap extraction immediately, and provides up to 21 days of continuous protection against re-infestation.
Where should farmers direct the spray nozzle when applying Pexalon?
Direct spray nozzles toward the base of rice tillers near the water line where brown planthoppers live and multiply.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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