Active ingredient and lipid inhibition mode of action
Spiromesifen functions as a lipid biosynthesis inhibitor (LBI, IRAC Group 23). By inhibiting the acetyl-CoA carboxylase enzyme, it shuts down fatty acid synthesis in target pests. This prevents immature nymphs and larvae from completing successful molts, while causing female whiteflies and mites to lay sterile, non-viable eggs.
- Active constituent: Spiromesifen 22.9% SC (suspension concentrate)
- Chemical group: Keto-enol / Tetronic acid derivative (IRAC Group 23)
- Activity profile: High juvenile toxicity against whitefly nymphs and excellent ovicidal action on spider mites
Target crops and major pest complexes
- Cotton: Whitefly nymphs (Bemisia tabaci) and two-spotted red spider mites.
- Chili: Yellow mite (Polyphagotarsonemus latus) causing severe downward leaf curling ('murda' disease).
- Tomato and brinjal: Whiteflies and carmine spider mites.
- Tea: Red spider mites infesting mature bushes.
Spray timing and application guidelines
Apply at the earliest sign of whitefly nymphal build-up or mite infestation, directing spray nozzles thoroughly to the undersides of leaves where pests reside. Maintain adequate water volume for uniform canopy penetration, and observe CIBRC label recommendations 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 Bayer Oberon?
Bayer Oberon contains Spiromesifen 22.9% SC, a lipid biosynthesis inhibitor.
Why is Bayer Oberon effective against chili leaf curl caused by yellow mites?
It provides strong translaminar efficacy against both nymphs and adult yellow mites, stopping feeding damage and leaf crinkling.
Does Oberon control adult whiteflies?
It targets nymphs primarily and sterilizes adult females; heavy adult populations may require tank-mixing or rotation with an adulticide.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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