TY - JOUR AU - Chaves-Barrantes, Néstor Felipe AU - Araya-Fernández, Carlos Manuel PY - 2012/06/01 Y2 - 2024/03/29 TI - Yield losses caused by bean amachamiento and reaction of commercial germoplasm to disease. JF - Agronomía Mesoamericana JA - Agron. Mesoam. VL - 23 IS - 1 SE - Articles DO - 10.15517/am.v23i1.2013 UR - https://revistas.ucr.ac.cr/index.php/agromeso/article/view/2013 SP - 01-12 AB - Yield losses caused by bean amachamiento and reaction<br />of commercial germoplasm to disease. Yield losses<br />caused by common bean “amachamiento” (Aphelenchoides<br />besseyi) was determined in fi eld plots from 2007 through<br />2008 in the Brunca and Huetar Norte production regions of<br />Costa Rica, as well as the reaction of commercial varieties to<br />the pathogen during 2009 in the Brunca region. In common<br />bean seed reproduction fi elds of the cultivar Cabecar, 83<br />micro-plots (3 m long on rows) were established to evaluate<br />yield losses, during the V3 or V4, R6 and R8 phenological<br />stages. Yield components were quantifi ed in each micro-plot<br />and by regression and correlation statistical analysis yield<br />losses were estimated. The bean cultivar reaction to the<br />disease was evaluated by natural inoculum pressure in ten<br />plants of Bribri, Chánguena, Cabécar, Gibre, Chirripó, Guaymí<br />and Brunca varieties; pod production was compared<br />to non-inoculated plants. T-tests for independent samples<br />was applied to this plant population. Yield losses in the<br />fi eld reached 71 to 80% in pod production and 70 to 85% in<br />yield. Seeds per pod (0-16%) and 100-seed weight (0-19%)<br />were non-signifi cant. None of the bean commercial varieties<br />showed resistance to the disease. ER -