Evaluation of the efficacy of some insecticides against few major insect-pests of rice.

摘要

Field studies were conducted in Assam, India, during the 2003 kharif season, to determine the efficacy of 8 different insecticides against certain rice pests, such as stem borer (Scirpophaga incertulas), gall midge (Orseolia oryzae), leaf folder (Cnaphalocrocis medinalis) and case worm (Parapoynx stagnalis), and using monocrotophos (Monocil 36 WSC) at 500 g a. i./ha as control. The results revealed that all the insecticidal treatments reduced the insect populations significantly over control and incurred significantly higher yield. Among the treatments, carbofuran (Furadan 3G) at 1000 g a. i./ha reduced maximum population of insect pests and gave highest yield (45.72% increase of yield over control). Besides carbofuran (Furadan 3 G), imidacloprid (Confidor 200 SL), profenofos (Carina 50 EC) and profenofos 40% + cypermethrin 5% showed better results than monocrotophos (control). Hence, these may also be applicable for rice pest management.