2024, Vol. 7, Issue 2, Part C

author(s)
YS Balgude and AM Tirmali

abstract
At the Agricultural Research Station in Lonavala, District of Pune (MS), a thorough screening program was implemented in an effort to identify the basis of the paddy's long-lasting resistance to blast. Over the course of three years, 3,917 advanced entries/varieties of rice from various origins were screened for leaf blast resistance (2016–18). Of the rice entries/varieties that were evaluated, 36 were resistant to neck blast during either of the testing years, while 174 were resistant and the remaining were moderately sensitive to highly susceptible to leaf blast. No rice entry was found to be extremely resistant to neck blast. The entries/varieties VL 31320, KJT 5-1-10-22-38-13, and CR 2675-10-2-1-1 were resistant, KJT-2, out of the 174 resistant entries that were evaluated. RAU 631-9-10, NLR 20104, PAU 3105-45-3-2, and 2K3-337-5-1-1-5. While Swarnadhan, HKR-05-22, and CN 1447-9-4-7 were somewhat vulnerable to leaf blast, CB-06-555 and TeTep were moderately resistant. These entries/varieties are therefore thought to have long-lasting resilience. The remaining entries showed unstable resistance to leaf blasts. It was discovered that the majority of entries/varieties with persistent resistance to leaf blast also had persistent resistance to panicle blast. VL 31320, KJT-2, HKR-05-22, CN 1447-9-4-7, PAU 3105-45-3-2, and 2K3-337-5-1-1-5 were moderately vulnerable to neck blast, whereas NLR 20104 was the only entry that was resistant. KJT 5-1-10-22-38-13 and TeTep were moderately resistant. Less than five disease severity indices to leaf and neck blasts were present in all of these entries. To evolve blast-resistant rice varieties for large-scale production, it is advised to use the types with durable resistance in breeding programs.