Influence of Certain Bio-physical Factors on Incidence of Pod Borer Complex in Selected Genotypes of Field bean*

Five plant parameters viz., pod length, pod width, trichome density, thickness and toughness of the pod were studied in nineteen selected genotypes of field bean which influenced the incidence of pod borer complex. Based on field incidence, HA-4 (white) was identified as a resistant genotype. Pod length and pod width were least in (4.51 x 0.75 cm, respectively) in HA-4 genotype. The susceptible cultivar (USA GP 36 (12-1) FB KO₂) had least number of trichomes on pod (9⁻¹⁰ mm²). Rind thicknes and pod toughness showed a negative correlation with pod damage. The susceptible genotype, GA 2–27, possessed lowest rind thickness (0.72 mm), least pod toughness (0.75 kg cm⁻²) as compared to resistant genotype, HA-4 (white) (1.42 mm & 0.85 kg cm⁻²), respectively.