@article{Vargas Cartagena_Sánchez_Vargas_Solórzano_Hernández_Iwasawa_Freer_2002, title={Presencia de bacterias en el xilema de cafetos (Rubiaceae: <i>Coffea arabica</i>) afectados por la enfermedad conocida como “Crespera”}, volume={50}, url={https://revistas.ucr.ac.cr/index.php/rbt/article/view/16151}, abstractNote={<span>“Crespera” is an infectious disease of coffee plants that affects both the coffee production and the economy of the coffee producer countries. This disease affects morphologically the plant: long and narrow leaves with wavy borders and marginal necrosis; strong chlorosis results in drying of the leave, and leads to bad conditions of the plant. The internodes are short, producing the appearance of multiple sprouts in the axial sprout, the flowers can turn greenish, and the plant can present branches with severe symptoms, and branches without apparent symptoms at the same time. As a result, the coffee bean production decreases strikingly. The aim of this work was to determine the occurrence of the possible causative agent in the coffee plants using transmission electron microscopy. Normal and infected plants were compared looking at the leaves, central vein, lateral veins and petiole. It was determined that xylematic vessels show the presence of gram negative bacilliform bacteria (of thick-wavy walls), with dimensions of 0.3-0.5 μm diameter and 1-4 μm, length. The control plants did not show bacteria in the xylem.</span>}, number={1}, journal={Revista de Biología Tropical}, author={Vargas Cartagena, Luis and Sánchez, Ethel and Vargas, Maribel and Solórzano, Arturo and Hernández, Francisco and Iwasawa, Haruo and Freer, Enrique}, year={2002}, month={Mar.}, pages={45–48} }