MONIKA RAJGURU, AMAR N. SHARMA AND SMITA BANERJEE

Bio–efficacy of aqueous extracts from Acacia arabica, Annona squamosa, Datura stramonium, Eucalyptus globulus, Ipomoea carnea, Lantana camara, Nicotiana tabacum and Pongamia pinnata was tested against a polyphagous pest Spodoptera litura (Fab.). Larval mortality increased with time and concentration. After a period of six days of treatment, maximum mean larval mortality was exhibited by D. stramonium leaf extract (69.44%) followed by A. squamosa (66.77%), A. arabica (64.88%) and I. carnea (57.33%) leaf extracts. Mean larval mortality of 50.20% was recorded with lowest concentration i.e. 25% which increased to 76.76% with 100% concentration. Sequence of efficacy of different extracts given in this paper will help using the most ideal extract depending upon larval stage and its population.