Abstract :
Studies on laboratory evaluation of nine aqua suspension formulations of entomopathogenic fungus, Beauveria bassiana (Balsamo) Vuillemin comprising adjuvants viz. 1) B.b.+GLY+CMC, 2) B.b.+GLY+HO, 3) B.b.+SFO+CMC 4) B.b.+SFO+HO 5) B.b.+GLY+BA, 6) B.b.+GLY+BA+TW, 7) B.b.+SFO, 8) B.b.+GNO and 9) Control (B.b. alone) were carried out against the II and III instar larvae of H.armigera. The data on larval mortality was recorded at 5, 7 and 10 days after treatment (DAT). At 10 DAT all the formulations were significantly superior to control (B.b. alone) for the lethal effect. The formulation B.b.+ SFO + CMC registered significantly highest larval mortality of 90.00 and 83.33 per cent of II and III instar larvae of H.armigera, respectively. However, it was at par to the formulation B.b.+ GLY + HO recording 86.67 and 80.00 per cent mortality of II and III instar larvae of H.armigera, respectively. The control (B. b. alone) recorded lowest (63.33 and 53.33 %) mortality of the caterpillar.
Keyword :
Beauveria bassiana, Adjuvants, Glycerol (GLY), Honey (HO), Sunflower oil (SFO), Groundnut oil (GNO), Tween 80 (TW), Carboxymethyl cellulose (CMC), Boric acid (BA)