author(s)
Alok Kumar Srivastav and BS Chandel

abstract
An experiment was conducted to test the insecticidal efficacy of five plant extracts against third instar larvae of Spilarctia obliqua Walk. under the laboratory and field conditions. The alcoholic extracts of leaves of Adhaloda vasica Nees, Solanum nigrum Linn, seeds of Cleome monoplylla Linn, Rhizome of Zingiber officinatis Rose, arial parts of Lantana camara Linn. were tested on mustard crop. Among them 2.0 % extracts of Adhaloda vasica and Lantana camara and Cleome monoplylla gave 63.28, 60.75, and 56.49 per cent mortality to the third instar larvae of Spilarctia obliqua Walk. whereas, S. nigrum and Z. officinalis showed 54.87 % and 50.66 per cent mean mortality were observed under the laboratory trials. All the extracts were considerably superior over control.