TY - JOUR AU - Mercado, Wanda I. AU - Rodríguez, Rocío del P. PY - 1999/10/01 Y2 - 2024/03/29 TI - Level of inoculum suitable for studies on the relationship of coffee seedlings and Rhizoctonia solani or Myrothecium roridum JF - The Journal of Agriculture of the University of Puerto Rico JA - JAUPR VL - 83 IS - 3-4 SE - Articles DO - 10.46429/jaupr.v83i3-4.3888 UR - https://revistas.upr.edu/index.php/jaupr/article/view/3888 SP - 181-188 AB - Suitable levels of inoculum of <em>Rhizoctonia solani</em> and <em>Myrothecium roridum</em> for the induction of symptoms in coffee (<em>Coffea arabica</em> L.) seedlings were determined in greenhouse tests based on the percentage of seedling mortality and disease incidence. Best inoculum level for <em>R. solani</em> and <em>M. roridum</em> was 15 and 10%, respectively. <em>Myrothecium roridum</em> was more virulent than <em>R. solani</em>, and thus caused higher mortality of coffee seedlings. For both pathogens, as the inoculum concentration increased, the dry weight of plants decreased. A direct positive relation between incidence of the disease and concentration of the inoculum was detected, it was found that <em>R. solani</em> is more persistent than <em>M. roridum</em> in the inoculated soil. ER -