author(s)
MMH Khan

abstract
The experiment was conducted to evaluate the bio-efficacy of insecticides for the management of whitefly in Sharupkhati variety of guava at PSTU campus and in the laboratory of the Department of Entomology, PSTU during January to March 2013. Results revealed that the efficacy of test insecticides in decreasing order was Ripcord 10EC @ 0.75 ml/L of water> Karate 2.5EC @ 1.00 ml/L of water> Chita 48EC @ 0.75 ml/L of water> Aktara 25WG @ 5 g/ L of water which were effective in the reduction of 1^st and 2^nd instar nymphal populations of guava whitefly. In case of 3^rd and 4^th instar nymphs, the efficacy of test insecticides in decreasing order was Aktara 25WG @ 5 g/ L of water> Karate 2.5EC @ 1.00 ml/L of water> Chita 48EC @ 1.00 ml/L of water> Ripcord 10EC @ 1.00 ml/L of water for reducing whitefly populations. For the reduction of adult guava whitefly, the efficacy of test insecticides in decreasing order was Chita 48EC @ 1.00ml/l of water> Ripcord 10EC @ 1.00 ml/L of water> Aktara 25WG @ 5 g/ L of water> Karate 2.5EC @ 0.75 ml/L of water. The percent mortality of adult guava whitefly was higher in dipping method of insecticide application in all the treatments except control as compared to spray method.