Studies Regarding the Morphological Identification of Fusarium sambucinum Fuckel Isolated from Potato Tubers

摘要

Fusarium sambucinum Fuckel - teleomorph Gibberella pulicaris (Fr.) Sacc. - is a common pathogen causing dry rot of stored tubers, in temperate areas. Fusarium dry rot is one of the most important diseases of potato ( Solanum tuberosum L.), affecting the tubers in storage and the seed pieces after planting. To establish strategies for the control of this disease it should be made primarily a correct diagnosis and identification of the pathogen. The purpose of this study is to identify based on morphological characters the Fusarium sambucinum Fuckel isolated from potato tubers. The characters followed are: the colony growth diameters, the culture pigmentation, the shape and the size of the macroconidia, the presence and the absence of the microconidia and of the chlamydospores. The isolates were obtained in two ways: directly from the tuber tissue and from the diseased sprout formed after the tuber was maintain in the damp chamber. In this study, the length and the width of 100 conidia from each Fusarium sambucinum Fuckel isolate were measured, having three isolates obtained directly from the tuber tissue and three isolates from spores formed on the surface of the tuber after keeping them in damp chamber conditions.