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

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