Rice (Oryza sativa), is the most important cereal crop grown in India which is served as a staple food for half of the world population. It is an important cereal crop of India, affected by the various fungal, bacterial and viral diseases, Brown spot of rice caused by Bipolaris oryzae (Cochliobolus) has become a major constraint to rice production. Three fungicides namely; Carbendazium, Propiconozal and Tricyclazole were evaluated at 100 ppm, 150 ppm and 250 ppm and data were recorded after 24 hours, 47 hours, and 72 hours of incubation. After 24 and 48 hours no. of treatment showed any evidence of mycelium growth. The maximum percent growth inhibition were recorded in T6 and T9 (100%) followed by T8 (75.00%), T7 (50.00%), T3 (33.37%) respectively, however minimum growth inhibition was occurred in T1 (8.37%) at 24 hours. The maximum percent growth inhibition were recorded in T6 (100%) followed by T9 (63.98%), T3 (62.00%), T8 (54.02%) respectively, however minimum growth inhibition was occurred in T1 (39.37%) at 48 hours. The maximum percent growth inhibition were recorded in T6 (79.69%). followed by T9 (70.16%), T3 (65.63%), respectively, however minimum growth inhibition was occurred in T1 (46.88%) at 72 hours.

Rice, H. oryzae, disease, fungicides and growth in inhibition

On the basic of present study it was concluded that Tricyclazole @ 250 ppm most effective to inhibit the growth of B. oryzae. So that Tricyclazole considered may be the most effective fungicide against brown spot disease of rice.

Neeraj Bhardwaj, Anupam Kumar, Vinod Kumar, Rajan Kamboj, Ritika Singh, Shivani Kundal, Prabhat Kumar, Sahil Chaudhary, Preeti Thakur and Ashish (2023). In-vitro Evaluation of Fungicides against Brown Spot (Bipolaris oryzae) Disease of Rice. Biological Forum – An International Journal, 15(12): 163-166.