Symptomatology of fusarium dry rot of potato tubers
DOI:
https://doi.org/10.31548/dopovidi2019.05.006Keywords:
potato, fusarium dry rot, symptoms, mixed rotsAbstract
Diagnosis of fusarium dry rot of potato was carried out and specifics of disease manifestation with coinfections was determined. Phytopathology researches were carried out in conformity with the generally accepted methods. The test samples of potato tubers were collected during the harvesting period and potato grading in the spring. It was determined that the signs of the potato tuber infection with Fusarium spp. are manifested when harvesting from a stolon part of the tuber in the form of depressions with the surface being even or wrinkled, and the pads of morphological pathogen patterns were formed on the affected area due to the increased humidity.
Storage of potato tubers under different conditions results in variability of the symptoms of fusarium dry rot. Thus, the diseased tissue dried out and turned brown under the conditions of low air humidity. There was no pathogen sporulation on the tuber surface, but it appeared inside. Fungal mycelium was intensively formed on the diseased tuber surfaces due to the high air humidity, and the affected tuber pulp became brownish, friable and the cavities filled with pathogen mycelium were formed in it.
Visual diagnosis of fusarium dry rot of potato can be complicated in the event of concurrent infection with different phytopathogens. During the years of researches, we have selected potato tubers and diagnosed the following mixed rots of mycotic-bacterial and mycotic-nematode nature: Phoma-fusarium blight, fusarium-nematode, fusarium and bacterial wet rot, and Ditylenchus destructor, fusarium and bacterial wet rot.
Over the years of researches, the quantity of potato tubers infected with fusarium dry rot made up 7 %. Fusarium coinfections were observed on 5,5 % of the tubers analysed.
The obtained research results can be used for phytopathology examination of seed tubers.
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