| dc.description.abstract | Evaluation of various fungicides, disease resistance inducing chemicals and poultry litter
against blast disease (Pyricularia grisea Sacc) of rice was conducted at Hajee
Mohammad Danesh Science and Technology University, Dinajpur during the period of
July-December 2014. A highly susceptible rice variety Jira Kataribhog was transplanted
in Randomized Complete Block Design with three replications and the application of
fungicides viz. Tilt 250EC, Bavistin DF, Trooper 75WP, resistance inducing chemicals
viz. Salicylic acid, Riboflavin (B2) and Poultry litter were given thrice at 15-d interval
commencing from 30 DAT. Data were collected on number of leaf spot per hill, leaf,
neck and node blast severity and yield. The leaf blast intensity was recorded at 37 DAT,
56DAT and 63DAT while the neck blast severity were recorded at 90 and 105 DAT. The
highest number of leaf spots per hill at 37, 56 and 63 DAT were found in control (17.00,
19.07, 21.07) and the lowest (6.73, 2.43) were found in Trooper 75WP sprayed plot but
found else in Bavistin DF sprayed plot (12.87) at 37 DAT. In case of percent leaf blast
severity at 37, 56 and 63 DAT, the highest leaf blast severity were observed in control
plot (6.03, 6.07, 6.17) and the lowest was found in Trooper 75WP sprayed plot (1.97,
1.07) except Bavistin DF sprayed plot (3.53) at 37 DAT. The results revealed that
percent decrease of leaf blast severity was the highest (82.66) in Trooper 75WP sprayed
plots over control. The highest percent infected necks (6.40%, 5.10%) were observed in
control plots and the lowest (2.53%, 1.80%) were in Trooper 75WP sprayed plot. The
percent infected node were recorded at 105 DAT where the highest percent infected node
(5.20%) was found in control and the lowest infected node (1.73%) was recorded in
Trooper 75WP sprayed plot. The yield loss were calculated and found the highest yield
loss (3.65%) in control and the lowest yield loss (1.44%) in Trooper sprayed plot. The
1000-grain weight was the highest in Trooper sprayed plot (11.41g) and the lowest in
control plot (9.86 g). Moreover, the highest yield per plot (3.63 Kg) was recorded in
Trooper 75WP sprayed plot and the lowest yield (2.67 Kg) was obtained from control
plot and the highest yield (4.54 t/ha) was recorded in Trooper 75WP sprayed plot and the
lowest yield (3.33 t/ha) was obtained in control plot. The highest yield increase was
obtained 36.34% in Trooper 75WP sprayed plot over control. Finally it may be concluded
that Trooper 75WP contributed effectively in controlling blast disease of Jira Kataribhog
rice with focusing very significantly higher yield. | en_US |
