Effect of rice cercosporidium caused by Cercospora Oryzae Miyake on the productivity of TS2 and IR841 under controlled conditions

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Résumé

Background and Objective: In Benin, rice production has increased significantly over the past five years. Despite this increase, numerous
parasitic constraints, particularly fungal, contribute significantly to the decline in productivity, making the country dependent on imports.
The present study aimed at improving the knowledge of Cercospora oryzae to increase rice yields. Materials and Methods: In a controlled
environment, a trial was set up using a split-Plot design. Agro-morphological parameters were evaluated based on observations and
measurements according to the IRRI 2002 scale. Results: The results obtained reveal a negative impact of Cercospora oryzae on rice
productivity. Cercospora oryzae hurts seedling emergence rates. In TS2, seedling emergence rates ranged from 65.10-98.85% for seeds
occulted with Cercospora oryzae and 97.85% for um inoculated seeds. Cercospora symptoms were observed on the leaves and stems
of all plants except those not inoculated with varying degrees of severity. Conclusion: The average number of productive tillers decreased
when inoculated early. Inoculation at the swelling and heading stages reduced the weight of 1000 grains. Cercosporidium negatively
impacts rice growth and yield.

Mots-clés

Rice, Cercospora oryzae, disease, yield, degrees of severity