Dual Active Chemistry and Complementary Modes of Action
Ronfen combines two potent biochemical modes of action to manage resistant sucking pests. Pyriproxyfen (8%) is a juvenile hormone mimic belonging to the pyridine ether group (IRAC Group 7C). It acts as an insect growth regulator (IGR), inhibiting embryogenesis inside insect eggs and blocking nymphs from metamorphosing into reproductive adults.
Diafenthiuron (30%) is a thiourea derivative (IRAC Group 12A) that inhibits mitochondrial ATP synthase. Upon exposure, it is photo-activated into carbodiimide, which halts cellular energy generation, delivering rapid paralytic knockdown of active adult whiteflies, mites, and thrips.
- Pyriproxyfen 8%: Juvenile hormone mimic that prevents egg hatching and stops nymphal molting.
- Diafenthiuron 30%: Mitochondrial ATP synthase inhibitor that halts cellular energy production in adults.
- Complete Life-Cycle Control: Destroys eggs, suppresses nymphal instars, and eliminates reproductive adults.
- Suspo-Emulsion (SE): High-stability liquid formulation designed for superior leaf retention and translaminar uptake.
Target Crops and Sucking Pest Complex
Ronfen is tailored primarily for high-value commercial crops including cotton, chilli, brinjal, and tomato, where mixed infestations of sucking insects cause severe economic damage and transmit debilitating viral pathogens.
It delivers outstanding control against the devastating whitefly complex (Bemisia tabaci), while simultaneously controlling broad mites, red spider mites, aphids, and jassids. Controlling whiteflies promptly halts the excretion of sticky honeydew that fosters black sooty mold on foliage.
- Whitefly Management: Provides complete knockdown of resistant whitefly adults while sterilizing female eggs.
- Mite Suppression: Effectively eliminates yellow mites in chilli and two-spotted spider mites in cotton.
- Virus Vector Prevention: Reduces transmission of cotton leaf curl virus and chilli leaf curl complex.
- Trans-Stigmatic Action: Vapor and translaminar action reaches pests hiding under dense leaf canopies.
Application Guidelines and Resistance Management
Apply Ronfen at the economic threshold level during early morning or late afternoon hours when sucking pests are actively colonizing leaf undersides. Maintain adequate water volume per acre and use hollow-cone nozzles for full foliage wetting.
To preserve product efficacy, avoid continuous sequential applications across an entire season. Rotate with insecticides of different IRAC groups, and adhere strictly to CIBRC-mandated pre-harvest intervals and personal protective equipment standards.
- Application Timing: Initiate spraying at early whitefly nymphal appearance to prevent population explosion.
- Uniform Coverage: Ensure spray reaches the underside of middle and lower canopy leaves.
- Resistance Rotation: Alternate with ketoenols, diamides, or neonicotinoids during the crop cycle.
- Protective Gear: Always wear face shields, respirators, and chemical-resistant gloves during spraying.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Central Insecticides Board and Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the chemical composition of Ronfen insecticide?
Ronfen contains Pyriproxyfen 8% and Diafenthiuron 30% SE (Suspo-Emulsion), combining an insect growth regulator with a mitochondrial ATP synthase inhibitor.
How does Ronfen control all life stages of whiteflies?
Pyriproxyfen sterilizes adult female eggs and halts nymphal development, while Diafenthiuron delivers fast knockdown of active feeding adult whiteflies.
Does Ronfen also control mites in chilli crops?
Yes, Diafenthiuron possesses strong acaricidal activity that effectively controls yellow and red spider mites in chilli and cotton.
Where can farmers find certified dosage recommendations for Ronfen?
Approved application rates, safety instructions, and pre-harvest intervals are printed on the product label and verified on the official CIBRC portal.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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