Field appraisal of controlled release formulations of cartap hydrochloride against rice leaf folder (Cnaphalocrocis medinalis)

An experiment was conducted during 2005 to study the bioefficacy of controlled release formulations of cartap hydrochloride (2-dimethylaminopropane-1, 3-diol) against the rice leaf folder [Cnaphalocrocis medinalis (Guenee)]. Controlled release formulations of insecticide cartap hydrochloride were prepared using commercially available polyvinyl chloride (emulsion and suspension), carboxy methyl cellulose and carboxy methyl cellulose with clay (bentonite, kaolinite and Fullers’ earth). These released cartap hydrochloride beyond 45 days as compared to 14 days from its commercial 4G. sodium carboxy Methyl cellulose-Kaolinite-based formulation provided a superior control (3.33%) of rice leaf folder in field grown rice (Oryza sativa L.) at half the dose (375 g a i/ha) in comparison to cartap hydrochloride 4 G (5.44%) at 72 days after treatment. The residue of cartap hydrochloride was detected below maximum residue limit of 0.1 mg/kg in grain 72 days after its application.