Reconocimiento y dispersión de hongos causantes del "picamento" (Rayspeck) en crisantemo (Chrysanthemum morifolium ram) en condiciones de invernadero

• Main Authors: Jorge Arturo Baquero, Martha Isabel Valencia, Emira Garces de Granada, Indiana Bustos B.
• Format: Article
• Language: English
• Published: Universidad Nacional de Colombia 1992-01-01
• Series: Acta Biológica Colombiana
• Subjects: ray-speck; stemphylium; alternarla; fitopatología
• Online Access: https://revistas.unal.edu.co/index.php/actabiol/article/view/21983

The recongnition of the fungi causing ray speck and their dispersion in chrysantemum (Chrysanthemum morifolium RAM) cv. Polaris, was carried out under greenhouse conditions. Three speciea were identified: Alternaria alternata (FR) Keiasler, Alternaria zinniae Ellis, Stemphylium botryosum, Wallroth lPleospora herbarum) Raben Horst. The analysis ofthe disease dispersion was based on a random deaign with three repetitions. The number of coloniea, the temperature and relative humidity were evaluated in four different placea of the culture. The temperature was found to be the most important factor afecting the production and releaSe of conidia. The sporulation reached ita peak at noon (21°C).