Mode of Action and Antifeedant Chemistry
Pymetrozine operates under a distinct neuroregulation mechanism (IRAC Group 9B) targeting chordotonal stretch receptor organs in sucking pests.
Within an hour of probing treated plant tissue, the insect's stylet is paralyzed. The pest is unable to feed or extract plant sap, leading to mortality from starvation.
- Active Molecule: Pymetrozine 50% WDG (Water Dispersible Granules)
- Target Organ: Chordotonal organ modulation disrupting hearing, gravity reception, and feeding mechanics
- Systemic and Translaminar: Absorbed through foliage and transported acropetally to protect newly expanding shoots
Target Pests and Crop Defense
Chess is a primary weapon against destructive homopteran pests that spread viral infections and cause hopper burn in cereal and cash crops.
In rice, it eliminates both nymphs and adults of the brown planthopper (BPH) and white-backed planthopper (WBPH) nestled at the plant base.
- Rice (Paddy): Brown planthopper (Nilaparvata lugens) and white-backed planthopper (Sogatella furcifera)
- Cotton: Whiteflies (Bemisia tabaci) and aphid complexes
- Vegetables and Mustard: Foliar aphids and leafhoppers causing stunting and honeydew mold
Application Technique and Pollinator Safety
Because planthoppers congregate at the base of rice stems, direct the spray nozzle toward the lower canopy rather than spraying solely over the top.
Chess exhibits an exceptional safety profile toward predatory spiders, mirid bugs, and honeybees, making it a cornerstone of Integrated Pest Management (IPM).
- Spray Placement: Form alleyways in dense paddy every 2 to 3 meters to deliver spray mist directly to stem bases
- Water Volume: Use at least 200 liters of water per acre for comprehensive canopy penetration
- IPM Friendly: Highly selective with minimal toxicity toward beneficial natural predators
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the technical ingredient in Syngenta Chess?
Chess contains pymetrozine 50% WDG, a selective chordotonal organ modulator insecticide.
How does Chess pesticide kill brown planthoppers?
It paralyzes the insect's stylet feeding apparatus within 1 to 2 hours of contact, preventing further sap feeding until the insect starves.
Is Chess safe for beneficial predators in rice fields?
Yes, Chess is highly selective and preserves natural natural enemies such as spiders, mirid bugs, and ladybird beetles.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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