Efficacy of tricyclazole 75% wp on paddy blast

Rice blast disease caused by Pyricularia oryzae is one of the most destructive and widely distributed diseases of rice, resulting in severe economic losses worldwide. It is particularly problematic in temperate regions, hilly tracts, tropical uplands, and delta areas, posing a major constraint to sustainable rice production. A field experiment was conducted at the Agricultural Research Station (ARS), Gangavati, to evaluate the efficacy of Tricyclazole 75% WP against rice blast (Pyricularia oryzae). The experiment was laid out in a Randomized Block Design (RBD) with six treatments and four replications. The fungicide was assessed along with standard checks and an untreated control for its effectiveness in managing blast incidence in rice. Results from both seasons of the study revealed that Tricyclazole 75% WP was highly effective in reducing disease severity. The treatment Tricyclazole 75% WP @ 300 g a.i./ha recorded the lowest disease severity, with 22.22 and 21.21 Percent Disease Index (PDI) and corresponding disease control of 48.72% and 47.59%, during Kharif 2011-12 and Kharif 2012-13, respectively. The same treatment also achieved the highest grain yields of 64.36 q/ha and 65.00 q/ha in the two seasons, the untreated control plots recorded the maximum disease severity (43.33% and 40.47% PDI) and the lowest grain yields (46.72 q/ha and 47.90 q/ha) during the respective years, the field trials clearly demonstrated that Tricyclazole 75% WP @ 300 g a.i./ha was superior and more effective than other treatments in minimizing the severity of rice blast and significantly improving grain yield under field conditions.