ABSTRACT
T.arjuna and T.tomentosa come under multipurpose tree category and are of immense economic importance besides being the primary food plants of Tasar silkworm Antheraea mylitta D. Blooming occurs from second week of May in T.arjuna and last week of May in T.tomentosa. Number of flowers per raceme range between 41 in accession 235 to 58 in accession 702 of T.arjuna and 53 (acc.531) to 73 (acc.501) of T. tomentosa. Fruit set per cent ranged between 2.0 in accessions 235 and 236 to 4.00 in accession 533 of T.arjuna. Per cent fruit set was 3.0 to 3.2 in accessions 501 and 531, respectively of T.tomentosa under open pollination condition. There was no fruit set in un - pollinated and covered racemes. Days required for fruit initiation in T.arjuna x T.arjuna combination varied between 12 to 14 days and fruit set was 1.8 to 2.5 percent. In T.arjuna x T.tomentosa combinations initiation of fruit set took 10 (acc.701 x acc.501) to 14 (acc.533 x acc.531) days and fruit set was 1.5 to 2.4 per cent. Present studies indicate that inter-specific hybridization is possible in T.arjuna and T.tomentosa. New hybrid varieties can be developed through inter-specific hybridization having higher yield in comparison to the existing genotypes.