). Thus, the isolation of new Cry pro- teins with varied sequence, higher toxicity and broader range of pests will be vital to overcome these problems. In the present study, Cry2Al1 showed promising larvicidal activity against S. litura
(LC50 = 2.448 lg/ml) and H. armigera (LC50 = 3.374 lg/ml). Recently
Zheng et al. (2010) reported Cry2Ag1 protein with insecticidal tox- icity towards H. armigera (LC50 = 9.745 lg/ml), Plutella xylostella (LC50 = 23.478 lg/ml) and Aedes aegypti (LC50 = 2.541 lg/ml) pests. Hire et al. (2009) reported the LC50 values of Cry2Aa14 protein against S. litura and H. armigera as 694 ng/cm2 and 122 ng/cm3
respectively. Lenin et al. (2001) reported a Cry2Aa protein which had shown 71.4% mortality and severe (81–99%) inhibition in lar- val growth of H. armigera on the seventh day at the concentration of 2.3 lg/ll. Besides in transgenic cotton plants Cry2Ab/Cry2Ae has been incorporated in addition to the Cry1A as a resistance manag-
ing mechanism (Christou et al., 2006; https://www.isaaa.org).