Y. LAKSHMI PRASANNA,V. RAJARAJSWARI, P. RAGHUVEER RAO, V. UMAMAHESH AND M. SREENIVAS PRASAD

Department of Crop Physiology, S.V. Agricultural College, ANGRAU, Tirupati– 517502, Chittoor (Dist), Andhra Pradesh

ABSTRACT

An artificial blast screening nursery experiment was conducted in blast screening nursery at Indian Institute of Rice Research (IIRR), Hyderabad during kharif 2015 to study the efficacy of silicon solubilizers on blast tolerance of eight rice genotypes. The treatments comprised of control (T0), silixol @ 0.2% (T1) and Imidazole @0.05% (T2) and sprayed before infection (preventive measures) and after infection (curative measures). The scoring for the blast disease was done at 7 DAS (Days after spraying), 14 DAS and 21 DAS. Results revealed that highest incidence of blast disease were observed in control (T ) followed
0
by silixol @ 0.2% treatment (T ) and Imidazole treatment @ 0.05% (T ). Highest PDI (Percentage disease index) was recorded in HR
1 2
12(V ) followed by CO 39 (V ), BPT5204(V ), PA6444(V ) and DRRH3(V ) showed complete susceptibility to blast. PA6201 (V ) and
8 7 6 4 1 3
PA6129 (V ) recorded lowest PDI and showed resistance towards the blast disease whereas PHB 71(V ) showed moderate
2 5

resistance towards blast disease. More effectiveness of treatments was recorded in pre inoculation spray compared to post inoculational spray.

KEY WORDS:

Rice, silicon solubilizer, PDI (Percentage Disease Index)