4. Conclusion
This study has revealed that plant extracts from processed coffee (C. arabica) at concentrations of 10% and 25%
(w/v) had the highest inhibitory effect (81.12% and 89.40%, respectively) against P. grisea—the causal agent of
rice blast disease. These results generally indicated that, the plant extracts used were not phytotoxic to rice
seedlings. More studies are therefore needed to confirm the current findings and to determine the most effective
formulation against P. grisea.
Acknowledgements
The authors wish to thank the Alliance for Green Revolution in Africa (AGRA) for financial support for this
work.