Selection and characterization of extracellular enzyme production by an endophytic fungi Aspergillus sojae and its bio-efficacy analysis against cotton leaf worm, Spodoptera litura oleh Duraisamy Elango, Velu Manikandan, Palaniyappan Jayanthi, Palanivel Velmurugan, Balasubramanian Balamuralikrishnan, Arumugam Veera Ravi, Muthugounder Subramaniam Shivakumar