Viroids and viroid diseases

cadang cadang del coco cadang cadang du cocotier chemicophysical properties chrysanthemum citrus coco coconut cadang cadang coconuts concombre control de enfermedades cucumbers disease control disease transmission enfermedades de las plantas ensayo epidemia epidemics epidemie fitopatologia hosts identification infection maladie des plantes noix de coco papa pathogens pepino plant diseases plant pathology plant viruses pomme de terre potatoes symptome symptoms testage testing tomate tomatoes transmission des maladies viroides viroids virus de las plantas