Nereistoxin Chemistry and Mode of Action
Cartap Hydrochloride (IRAC Group 14) acts as a synaptic blocking agent by binding to nicotinic acetylcholine receptors in insect nerve cells. This blocks neurotransmission, leading to rapid muscle paralysis, immediate cessation of feeding, and insect death.
Its strong systemic and translaminar activity allows it to translocate through plant vascular tissues, controlling hidden borer larvae within plant stems.
- Paddy: Yellow stem borer (Scirpophaga incertulas) and leaf folder (Cnaphalocrocis medinalis).
- Sugarcane: Early shoot borer and top borer.
- Cabbage & cauliflower: Diamondback moth (Plutella xylostella).
- Feeding cessation: Pest larvae stop chewing plant tissues immediately after ingesting or contacting the chemical.
Spray Guidelines and Safe Application
Caldan 50 SP dissolves completely in spray water to form a clear soluble powder solution.
Applying when pest scouting reveals egg masses or first-instar larvae delivers maximum yield protection before caterpillars bore into stems.
- Calibrate knapsack sprayers to deliver complete canopy and stem wash using hollow cone nozzles.
- Do not mix with alkaline agrochemicals or copper-based sprays that degrade Cartap molecules.
- Observe the pre-harvest withholding interval (PHI) and wear personal protective clothing during spraying.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active ingredient in Dhanuka Caldan 50 SP?
Caldan 50 SP contains Cartap Hydrochloride 50% SP, a systemic nereistoxin analogue insecticide.
How does Caldan control yellow stem borer in paddy?
Its systemic action translocates through plant stems where stem borer larvae feed, paralyzing their nervous system and halting feeding.
Is Caldan 50 SP a liquid or a soluble powder?
It is a 100% water-soluble powder (SP) that dissolves completely in water without leaving suspended sediment.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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