Evaluation of pigeonpea mini-core germplasm collection for resistance to pod borers
Keywords:
Helicoverpa armigera, Host plant resistance, Minicore collection, Maruca vitrata, Pigeonpea, Pod borersAbstract
Because of the increasing difficulties in managing the pod borers Helicoverpa armigera and Maruca vitrata on pigeonpea with synthetic insecticides, it is important to identify genotypes with resistance to pod borers for use in an integrated pest management. Therefore, a minicore collection consisting of 146 lines was evaluated for resistance to pod borers, H. armigera and M. vitrata, for four seasons under field conditions. The test entries were planted along with the resistant (ICPL 332WR) and susceptible (ICPL 87) checks in the field in a balanced alpha design. In the mini-core collection, 51 lines exhibited a yield potential of >10 q/ha under unprotected conditions, of which 12 lines (ICP 655, ICP 772, ICP 995, ICP 1071, ICP 1279, ICP 2698, ICP 2746, ICP 6128, ICP 9414, ICP 12596, ICP 14701 and ICP 8863) also showed moderate levels of resistance/tolerance to pod borers (damage rating 3 - 5, where 1 = <10% pod damage, and 9 = >80% pod damage). Fifteen lines exhibited moderate levels of resistance across seasons, of which ICP 11181, ICP 11378, ICP 12088, ICP 12510, ICP 13631, ICP 5825, ICP 7035, ICP 9104 and ICP 9273 suffered <20% pod damage as compared to 15% in the resistant check, ICPL 332WR, and 42% in the susceptible check, ICPL 87. The germplasm lines ICP 12510, ICPL 87119, ICP 13631, ICP 6648, ICP 2933, ICPL 332WR, ICP 11181, ICP 5825, ICP 9273, ICP 7035 and ICP 9104, which exhibited moderate levels of resistance/tolerance to pod borers, showed a yield potential of >10 q/ha. These lines can be used for cultivation by the farmers per se or used in pigeonpea improvement to decrease over dependence on pesticides for sustainable crop production
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