Chemical properties and dual ovicidal-larvicidal mechanism
Thiodicarb exhibits specialized biological activity against both insect egg stages and actively feeding larvae.
- Carbamate chemistry (IRAC Group 1A): Reversibly inhibits acetylcholinesterase, leading to nervous system failure in target pests.
- True ovicidal action: Kills insect eggs upon direct spray contact or prevents hatching larvae from emerging through treated egg chorion.
- Stomach and contact action: Quickly paralyzes caterpillars upon ingestion of treated foliage, halting feeding within hours.
- Wettable powder (75% WP) formulation: Suspends cleanly in water to provide uniform protective foliar deposits.
Target crops and major lepidopteran pest complexes
Larvin is officially registered under CIBRC guidelines for managing aggressive caterpillar infestations in major field crops.
- Cotton: Control of American bollworm (Helicoverpa armigera), spotted bollworm, and tobacco caterpillar (Spodoptera litura).
- Soybean and Pulses: Effective suppression of green semilooper, Spodoptera, and pod borer complexes.
- Vegetables (Cabbage, Cauliflower, Tomato): Control of diamondback moth and fruit borer larvae.
- Residual protection: Provides persistent control even under hot subtropical weather conditions.
Application guidelines, safety, and resistance stewardship
Apply Larvin at the initial appearance of egg masses or young early-instar larvae using hollow cone spray nozzles. Operators must wear full protective clothing, chemical-resistant gloves, and face masks. To manage insect resistance, rotate Thiodicarb with insecticides from alternative chemical classes such as diamides or spinosyns.
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 ↗Related on KisanPe
Common questions
What is the technical chemical in Larvin insecticide?
Larvin contains Thiodicarb 75% WP, a broad-spectrum carbamate insecticide with ovicidal and larvicidal properties.
How does Larvin act as an ovicide?
It penetrates the outer shell of insect eggs on contact, killing developing embryos and stopping newly hatched larvae from surviving.
Which major pest does Larvin control in cotton and pulses?
It is widely used to control bollworms (Helicoverpa), armyworms (Spodoptera), and semilooper caterpillars.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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