Active ingredient and biochemical mode of action
Spiromesifen functions as a lipid biosynthesis inhibitor (LBI), classified under IRAC Group 23. By inhibiting acetyl-CoA carboxylase, it stops lipid synthesis in target insects, preventing immature nymphs from molting into adults and significantly reducing female egg viability.
- Active constituent: Spiromesifen 22.9% SC (suspension concentrate)
- Chemical family: Tetronic acid / keto-enol derivative (IRAC Group 23)
- Activity spectrum: Strong efficacy against whitefly nymphs and all developmental stages of phytophagous mites
Target crops and major pest complexes
- Cotton: Bemisia tabaci (whitefly nymphs) and two-spotted spider mites.
- Chili: Yellow mites (Polyphagotarsonemus latus) causing severe leaf curling and crinkling.
- Tomato and brinjal: Whiteflies, red spider mites, and broad mites.
- Tea: Red spider mites infesting mature and maintenance foliage.
Application advice and resistance management
Apply at the first sign of nymphal whitefly or mite build-up, directing the spray thoroughly to the undersides of leaves where pests congregate. Because Spiromesifen primarily targets immature stages, rotate with adulticides when adult pressure is heavy. Always observe approved label doses and pre-harvest intervals.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active ingredient in Oberon?
The active ingredient is Spiromesifen (22.9% SC), a lipid biosynthesis inhibitor.
Does Oberon control adult whiteflies?
It primarily targets nymphs and reduces adult female fecundity, so heavy adult infestations may require combination with an adulticide.
Why is underside leaf spraying critical for Oberon?
Whitefly nymphs and spider mites reside primarily on the undersides of leaves, making thorough canopy penetration essential.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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