Emamectin benzoate

Emamectin benzoate is a semi-synthetic avermectin macrolide insecticide derived from abamectin (a fermentation product of Streptomyces avermitilis). It is one of the most widely used insecticides in Indian cotton and vegetable IPM programmes for caterpillar control.

Composition / Active ingredient

Active ingredient: Emamectin benzoate
Formulations: 5% SG / WG (Proclaim, EMA5, Emaan and generics); 1.9% EC
Chemical class: Avermectin (macrocyclic lactone)

Mode of action

Emamectin benzoate is a glutamate-gated chloride channel (GluCl) allosteric modulator, classified under IRAC Group 6. It opens chloride channels in insect neuromuscular junctions, causing hyperpolarisation, paralysis and irreversible feeding cessation within hours. Activity is specifically on the larval stage of Lepidopteran pests; adults and eggs are largely unaffected.

Target use and dose

The molecule controls Helicoverpa armigera, Spodoptera, diamondback moth, leaf folder and other lepidopteran larvae. Standard 5% SG/WG rates:

Cotton: 76-88 g/acre (also 100 g/acre against heavy larval pressure)
Okra: 54-68 g/acre
Chilli and brinjal: 80 g/acre
Marigold and ornamentals: ~2 g/L (raised from the 100 g/acre default) for flower pests, Spodoptera and gram caterpillar
Beans: a standard option alongside Ampligo and Coragen Chlorantraniliprole for caterpillars/borers

Safety and regulatory status

Emamectin benzoate is highly toxic to fish and aquatic invertebrates; label buffer zones around water bodies apply. It is compatible with most IPM programmes due to short residual on non-target arthropods. Rotation with Chlorantraniliprole (Group 28), Spinosad Spinetoram Larvicides (Group 5) and Broflanilide Exponus (Group 30) preserves susceptibility.

References

Emamectin benzoate active ingredient profile. IRAC.
EMA5 — Emamectin benzoate 5% WG. Katyayani Organics.