Unique neurological mode of action and feeding cessation
Pymetrozine possesses a distinct mode of action that targets sensory chordotonal organs without causing immediate neurotoxic twitching.
- Acts on chordotonal stretch receptors, disrupting insect balance, orientation, and salivary pump function.
- Causes irreversible feeding cessation within one to two hours of ingestion or contact.
- Insects withdraw their stylets from plant phloem vessels and die of starvation and dehydration within a few days.
- Significantly reduces transmission of devastating plant viral diseases like rice grassy stunt and ragged stunt.
Rice brown planthopper (BPH) control and application window
Chess is an industry benchmark for protecting wetland rice paddies against destructive planthopper outbreaks.
- Targets both nymphs and adult brown planthoppers (Nilaparvata lugens) and whitebacked planthoppers (Sogatella furcifera).
- Apply at the early hopper build-up stage (typically 5 to 10 hoppers per hill) before hopper burn patches develop.
- Direct the spray nozzle toward the lower stem base of the rice canopy where planthoppers congregate and feed.
- Systemic movement through xylem vessels distributes active ingredient into newly developing tillers.
Safety to beneficial predators and IPM compatibility
Because of its high physiological selectivity, Pymetrozine exhibits remarkable safety toward beneficial predatory spiders (Lycosa pseudoannulata), mirid bugs (Cyrtorhinus lividipennis), and honeybees. It preserves the natural predatory balance within paddy ecosystems, making it an ideal anchor molecule in integrated pest management programmes.
Official source
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Central Insecticides Board and Registration Committee ↗Related on KisanPe
Common questions
How does Chess insecticide eliminate brown planthoppers in rice?
Chess disrupts the insect chordotonal sensory organs, causing immediate and permanent feeding cessation so hoppers die of starvation.
Does Chess insecticide kill beneficial spiders in rice fields?
No, Pymetrozine is highly selective to sap-sucking pests and has negligible toxicity toward predatory spiders and mirid bugs.
Where should the spray be directed when applying Chess in rice paddies?
Spray must be directed toward the lower base of rice hills where hoppers shelter and feed on stem sap.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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