Nyaberi, Halson Ogeto2025-09-012025-09-012025-06https://ir-library.ku.ac.ke/handle/123456789/31334A thesis submitted in fulfilment of the requirements for the award of the degree of Ph.D. in Applied Mathematics in the School of Pure and Applied Sciences of Kenyatta University June 2025 Supervisors: Prof. Winifred Mutuku Prof. David M. Malonza Dr. Grace GachiguaenMathematical modeling for the co-infection of coffee berry disease and coffee leaf rust with optimal control and cost-effectiveness analysisThesis