Bio Physical Basis of Resistance to Tobacco Caterpillar Spodoptera litura (Fab.) in Castor

Castor, (Ricinus communis L.) is one of the most important commercial, non-edible oilseed crop. Tobacco caterpillar, Spodoptera litura (Noctuidae: Lepidoptera), a major defoliator castor. The biophysical factors in castor play role conferring resistance against S.litura. present study was conducted with an objective, to basis S. litura. Feeding preference larvae leaves IVHT-39 followed by Salem Local minimum confinement test. recorded feeding S.litura free choice test DCS-107. Biophysical (Leaf length, Leaf breadth, Total leaf area, thickness, Petiole length and angle stem) were analysed. In study, breadth area exerted positive correlation larval stem had significant negative