Carnation is the most important ornamental grown in colombian greenhouses. Among the fungal diseases, one of the pathogen with great importance is Fusarium oxysporum f. sp, dianthi. The vascular wilt pathogen Phialophora cinerescens is also found but with a very narrow distribution. Stem rot caused by Fusarium roseum is found is greenhouses with poor management and mainly after harvesting. Other soil pathogens as Rhizoctonia sotsni, Sclerotinia scterotiorum, Phythium sp, and Phytophthora sp. ha ve been ocasionally recognized. Among diseases than affect the foliage, the most important pathogen is Heterosporium echinulatum particularly in miniature carnation and in some mediterranean standard varieties. Carnation rust caused by Uromyces caryophyllinus causes important losses in some areas at the Bogota plateau, specially during the rainy season. Leaf spot caused by Alternaria dianthi has a very little importance and it is present at cutting rooting periodo Peronospora diathicola is also found with low incidence. Flower rooting produced by Botrytis cinerea has been reported with a mild incidence particularly during rainy season on some varieties. The importance of this pathogen on carnation is minor comparad to its importance on other ornamental crops, such as statice and chrysanthemum. Among bacterial diseases only the leaf spot caused by Pseudomonss woodsii has been recorded with a very low incidence.