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Soil Microbial Ecology Associated with Disease Control of Fusarium oxysporum f. sp. Cucumerinum in Cucumis sativus Cultivation Following Soil Fumigation with Anhydrous Ammonia in China

Jun 15, 2015, 9:00am - 10:00am

A Graduate Defense Seminar will be presented by Joshua Kendall, PhD Candidate in Soil Science, on Monday (6/15) at 9:00 a.m. in 333C Kottman Hall with a link to 117A Williams Hall. His presentation will be Soil Microbial Ecology Associated with Disease Control of Fusarium oxysporum f. sp. Cucumerinum in Cucumis sativus Cultivation Following Soil Fumigation with Anhydrous Ammonia in China.

Fusarium oxysporum f. sp. Cucumerinum is a pathogen affecting cucumber (Cucumis sativus) production in China. Soil fumigation with anhydrous ammonia and rotation of cucumber with other crops increased yield and reduce disease incidence in cucumber monoculture that had low yield and high disease incidence. Soil microbial communities were identified using sequenced amplicons of 16s and ITS1 rDNA from soil isolated DNA. In 2013, soil samples were taken from a time series of soil fumigated with anhydrous ammonia and soil not fumigated in cucumber monoculture near Jinhua, Zhejiang, China. In 2014, soil samples were collected from soil fumigated with anhydrous ammonia in 2013, soil in tomato-celery-cucumber crop rotation and soil not fumigated in the same cucumber monoculture fields as the year prior. Patterns of succession, plant benneficial communities, and communitites associated with each treatment provide insight into the microbial communities assocciated with the management of soil for control of this disease. Fumigated and rotation treatment soil expressed disease control based on significantly different microbial communities suggesting consequences for resilience and broader soil function.