Rice bug and pathogen interaction on grain discoloration
1984
Lee, S.C. | Alvenda, M.E. | Bonman, J.M. (International Rice Research Inst., Los Banos, Laguna (Philippines))
Discolored grains have been attributed to fungal pathogens and rice bug associated with the rice panicles. To determine the interaction between the pathogen and rice bug on grain discoloration, IR36 at the early milk stage was infested with 20, 14 and 18 5th instar rice bugs per 10 panicles before inoculation of the pathogens Curvularia lunata and Dreschlera oryzae. Results indicated that the incidence of grain discoloration was significantly higher in treatments where both rice bug and pathogen were present than when they occurred singly. Although there were more discolored grains on panicles treated with C. lunata, there were less unfilled grains as compared with rice bug alone. With D. oryzae, similar results on grain discoloration were obtained, however, there was no significant difference on the percentage of unfilled grains between the fungus and rice bug alone
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