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The influence of bio-preparation Biosept 33 SL on fungi colonizing of sweet pepper plants [Capsicum annuum L.] cultivated in the field

100%

Jamiolkowska A.

nr 3

Skuteczność biologicznych środków w ochronie papryki przed patogenami.

51%

Cwalina-Ambroziak B. , Czajka W.

2010

tom 50

nr 1

Capsicum pepper, cv. Ożarowska, was grown in the greenhouse of University of Warmia and Mazury in Olsztyn, in experimental treatments involving biological control with mycorrhizal inoculum, Biochikol 020 PC, Polyversum and Asahi SL and chemical control with Bravo 500 SC. Plants without control measures served as a control treatment. After fruit harvest, samples of soil, stems and roots were collected, and fungi were isolated in the laboratory. The richest fungal community, dominated by yeast-like fungi, was found in soil samples. The proportion of pathogens (Alternaria alternata, Botrytis cinerea, Colletotrichum coccodes and species of Fusarium) was low and did not exceed 5% in the control treatments. The lowest number of pathogens were recorded in the soil under plants sprayed with Polyversum. Pathogenic fungi colonized also roots and stems of unprotected plants, accounting for 55.3% and 39.6% of the total population, respectively. The highest reduction in the abundance of the analyzed pathogens was recorded on stems and roots of peppers sprayed with the fungicide, in comparison with the control treatment. All tested methods of biological control effectively reduced severity of infection caused by pathogens. The abundance of pathogenic agents on stems and roots decreased to a greatest degree following the application of Biochikol 020 PC.