The object of the experiment was fodder galega (<em>Galega orientalis</em> Lam.) cultivated in 2001-2003 as field crop on three plots: 1. without fertilization, 2. 40 kg P<sub>2</sub>O<sub>5</sub> × ha<sup>-1</sup> and 80 kg K<sub>2</sub>O × ha<sup>-1</sup>, 3. 80 kg P<sub>2</sub>O<sub>5</sub> × ha<sup>-1</sup> and 160 kg K<sub>2</sub>O × ha<sup>-1</sup>. During the dry and warm vegetation season of 2002 almost two times fewer isolates were obtained from the leaves than in 2003 that was the most abundant in fungi. Yeasts-like fungi (30% of the total number of isolates) and saprotrophic fungi with dominated species: <em>Acremonium strictum</em> (8.5%), genus <em>Epicoccum</em> (7.8%), <em>Humicola</em> (9.5%) and <em>Penicillium</em> (18.9%) were the fungi most frequently populating the leaves of galega. The share of pathogens in the total number of isolates obtained from the phyllosphere was 10.6%. They were represented by fungi of <em>Ascochyta</em> spp., <em>Botrytis cinerea</em>, genus <em>Fusarium, Phoma medicaginis</em> and <em>Sclerotinia sclerotiorum</em>. Reduction by 1.9 to 4.6% in the number of fungi isolated from the phyllosphere of galega without fertilization as compared to galega cultivated in combinations with fertilization was recorded. Generally, the smallest number of pathogens was recovered from galega fertilized with 40 kg P<sub>2</sub>O<sub>5</sub> × ha<sup>-1</sup> and 80 kg K<sub>2</sub>O × ha<sup>-1</sup>. <em>B. cinerea</em> most frequently populated galega in combination without fertilization, genus <em>Fusarium fungi</em> in combination without fertilization and with fertilization with 80 kg P<sub>2</sub>O<sub>5</sub> × ha<sup>-1</sup> and 160 kg K<sub>2</sub>O × ha<sup>-1</sup>, while <em>Ascochyta</em> spp. were isolated from galega with fertilization only.
The aim of the laboratory experiment was the isolation of fungi colonized potato tubers directly (immediately) after harvest and after 5-month storage. 67 potato tubers samples collected in 1998 and 1999 from the areas of province Warmia and Mazury were examined. The occurrence of 36 and 46 species were confirmed on analyzed tubers after harvest and storage, respectively. The most frequent species which occurred on tubers were: <i>Alternaria alternata</i> (9,4%), <i>Colletotrichum cocco- des</i> (12,6%), <i>Rhizoctonia solani</i> (7,4%) and fungi from <i>Fusarium genera</i> (8,7%).This fungi, except <i>Rhizoctonia solani</i>, more often colonized potato tubers afier storage. Among saprofitic fungi most frequent were: <i>Epicoccum</i> (3,4%), <i>Mortierella</i> (3,1%), <i>Mucor</i>(6,0%), <i>Penicillium</i> (17,0%), <i>Rhizopus</i> (7,1%) and <i>Trichoderma</i> (12,9%). More colonies of fungi were obtained from potato tubers analyzed after harvest. Remaining fungi were more frequently isolated after storage.
Laboratory experiment were caried out to isolate fungi from the seeds of goat rue cultivated with and without fertilization. Additionally, kind of medium (PDA and mineral medium) and mean of preparation seeds, were factors differentiated number of fungi. Species such as <i>Alternaria alternata</i> (51,6%) and <i>Botrytis cinerea</i> (20,4% of total colony) were isolated from seeds most frequently. From combination without fertilization 7,2% more isolates were obtained. Mineral medium and superficial disinfection of seeds had reducing influence on number of isolates.
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