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6. Reduced larval and pupal weights, prolonged larval and pupal development on resistant genotypes (ICPL 332, ICPL 84060, ICP 7035, ICPL 187-1, ICPL 88039 and ICP 7203-1) compared to the susceptible genotypes (ICPL 87, ICPL 871 19 and ICPL 87091) indicated that antibiosis is one of the components of

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inhibitor or antifeedent substance or both existed in the resistant genotypes.

7. Five morphologically distinct trichomes (Type A, B, C, D and E) were identified from pods and calyxes of the 12 pigeonpea genotypes. Type A and B trichomes were present in greater density in flowers and pods. In case of pods, Type D trichomes were present in greater numbers as compared to Type A. High density of glandular trichomes (Type A and Type B) might contribute to the larval mortality on the resistant genotypes (ICPL 84060, ICPL 871 19, ICPL 88039, ICP 7203-1, ICPL 187-1 and T21).

8. The pod surface extracts of ICPL 87 and ICPL 332 stimulated feeding by the third- fourth-and fifth-instar larve of H,armigera when presented at pod surface equivalents. The attraction of H.armigera larvae to ICPL 87 and lCPL 332 plant extracts might be due to some chemical compounds present in the pod surface extracts.

9. Among the 12 genotypes tested, the amounts of potassium and phosphorus were lower in resistant genotypes such as lCPL 332, ICPL 84060, ICP 7035 and ICPL 187-1, but high in the susceptible check, ICPL 87. Protein content was quite high in the pod borer resistant genotypes (ICPL 332, ICP 7035 and ICPL 84060).

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low phosphorus and potassium contents may intluence the extent of feeding.

10. Studies on yield loss under protected and unprotected conditions revealed tolerance as one of the mechanisms of resistance to H.armigera. Reduction in grain yield was lower in resistant check lCPL 332, followed by lCPL 84060, ICPL 87 and ICPL 871 19 indicating tolerance to pod borer damage in these genotypes.

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used in pigeonpea improvement programs. The resistance mechanisms involved in these genotypes can be exploited to develop varieties resistant to H. armigera in

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