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United States Department of Agriculture

Agricultural Research Service

Title: Effect of N Source on Root Exudates and Yield of Eggplants Grown in Verticillium Infested Soil

item Gaskins, V - UMES, PRINCESS ANNE, MD
item Fravel, Deborah
item Roberts, Daniel
item Buyer, Jeffrey
item Brooks, C - UMES, PRINCESS ANNE, MD
item Morant, M - UMES, PRINCESS ANNE, MD

Submitted to: National American Phytopathology Meetings
Publication Type: Abstract Only
Publication Acceptance Date: July 6, 1999
Publication Date: N/A

Technical Abstract: Poultry compost and NH4NO3 were evaluated for their impact on the incidence of Verticillium wilt in susceptible and tolerant eggplant under field and greenhouse conditions. The quantity of root exudates and population density of Trichoderma spp. as affected by amendments were also determined. Roots were treated with antibiotics and exudates were subsequently analyzed by Gas Chromatography. Populations of Trichoderma were determined by plating soil dilutions on modified malt agar. Under greenhouse conditions, the concentration of simple and complex sugars was greater in the presence of the pathogen, regardless of the type of amendment. Trichoderma spp. were not significantly affected by amendment or pathogen infestation, but populations were greater in soil taken at the beginning of the growing season. In 1988, fruit yield of Dusky (susceptible) was significantly greater than Early Bird (tolerant) when plants were grown with NH4NO3 amended soil that was infested with V. dahliae.

Last Modified: 4/22/2015