Managing cassava disease transmitted through asexual seed

biological control cassava chemical control control biológico control de enfermedades control químico cuttings disease control diseases enfermedades de las plantas esquejado heat heat treatment investigación en la finca manihot esculenta on-farm research phytophthora drechsleri phytophthora palmivora plant diseases podredumbre de la raíz propagation by cuttings research root rots rots seed sphaceloma manihoticola tratamiento térmico trichoderma xanthomonas axonopodis