Active Ingredient Profile and Mesoionic Mode of Action
Pexalon contains Triflumezopyrim (10% SC), belonging to the novel mesoionic chemical class (IRAC Group 4E).
It works by binding to nicotinic acetylcholine receptors at distinct allosteric orthosteric sub-sites, blocking neurotransmission in planthoppers.
Target planthoppers cease crop sap feeding within one hour of spray exposure, followed by irreversible paralysis and death.
- Formulation: 10 percent Suspension Concentrate (SC)
- Mesoionic chemistry: Overcomes resistance developed by planthoppers against neonicotinoids and pymetrozine
- Fast feeding cessation: Stops sap feeding within 60 minutes, immediately blocking hopper burn damage
- Long residual control: A single spray provides up to thirty days of continuous protection
Target Pests and Application Window in Paddy
Pexalon is registered specifically for direct-seeded and transplanted rice to control devastating planthopper complexes.
Applying at early hopper colonization (four to five hoppers per hill) prevents severe hopper burn epidemics from lodging fields.
- Brown Planthopper (BPH / Nilaparvata lugens): Suppresses nymphs and feeding adult macropterous hoppers
- White-Backed Planthopper (WBPH / Sogatella furcifera): Eliminates early vegetative planthopper colonies
- Single application window: Apply at early hopper initiation (45 to 60 days after transplanting)
Spraying Directions, Plant Base Delivery, and Safety
Because planthoppers shelter and feed at the lower base of rice tillers, spray nozzles must be directed downward into the hill bases.
Maintain adequate spray water volume per acre (at least 200 liters) using hollow cone nozzles, and drain excessive standing water prior to spraying.
Pexalon exhibits outstanding selectivity, sparing beneficial predatory spiders, mirid bugs, and aquatic organisms.
- Hill base targeting: Direct spray wands downward to reach lower leaf sheaths where hoppers congregate
- Water volume: Use at least 200 liters of clean water per acre for thorough hill-base penetration
- Beneficial safety: High safety margin for spiders and predatory mirid bugs in rice ecosystems
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the technical active chemical in Corteva Pexalon?
Pexalon contains Triflumezopyrim 10% SC (Pyraxalt), a novel mesoionic insecticide.
How quickly does Pexalon stop planthopper damage in rice?
Planthoppers cease sap feeding within 60 minutes of spray contact, completely preventing the onset of hopper burn.
How long does a single spray of Pexalon protect rice crops?
A single timely spray of Pexalon provides persistent residual planthopper protection for up to thirty days.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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