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The aim of research was to characterize epiphyte micromycetes observed on variable cotton fibers accessions, to estimate the range of fiber destruction and select cotton, which were the most resistant to fungus damage. The accessions of differently colored Upland Cotton varieties ( Gossypium hirsutum  L.) evaluated: eleven cotton of natural green, twelve – of brown and eleven of conventional white color. Cotton plants have been grown in Sothern Federal District, RF. The fiber samples for the study were placed into a thermostat in sterile Petri dishes on moistened filter paper in order to stimulate the development of mycelium or sporulation of fungi naturally occurred on fibers. Incubation carried out in a thermostat at a +24-28 °C, humidity of 90-100% and exposed for 28 days. The samples examined with a microscope or binocular magnifier.  Aspergillus ustus  (Bainier),  A. fumigatus  Fresen.,  A. niger  v. Tiegh.,  A. flavus  Link,  Penicillium aurantiogriseum  Dierckx,  P. notatum  Westling,  Rhizopus nigricans  Ehrenb. and  Alternaria alternata  (Fuier) Keissler were detected. Compared with exposed white, accession of green and brown colors were significantly resistant to fungus. The mean of destruction (K) of white cotton varied up to 0.95, but colored accessions not exceeded 0.3 (initial destruction of the surface, not affecting internal fiber’s structure).

Micromycetes-resistant colored cotton is promising material to reduce mycotoxins amounts in textiles