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MORPHOLOGICAL CHARACTERISTICS OF THE CAUSAL AGENT OF BROWN SPOT DISEASE IN NATURAL CONDITIONS Biljana Gveroska 1 University”St.Kliment Ohridski”-Bitola, Scientific Tobacco Institute-Prilep Kicevski pat bb, 7500 Prilep; e-mail: gveroska@t-home.mk
ABSTRACT Alternaria alternata is a variable species which morphological characteristics highly depend on the effect of environmental factors. Measurements are usually made on pure culture of the fungus, but the aim of these investigations was to give data on morphological characteristic of the species in naturally infected tobacco leaves. Microscopic measurements revealed that in this case the hyphae of A. alternata are thinner, while conidiophores are wider and longer compared to those in pure culture. It was also determined that the conidial size is larger and the number of transverse and longitudinal septa is higher. Oblique septa are also present. The chains are longer and consist of 3-7 conidia.
Key words: Alternaria alternata, tobacco |
