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Corky root disease management in organic tomato production

composts, fungivorous nematodes and grower participation

Hasna, Mahbuba Kaniz (2007). Corky root disease management in organic tomato production. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2007:114
ISBN 978-91-85913-13-8
[Doctoral thesis]

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The role of composts and fungivorous nematodes in the control of corky root disease of tomato caused by the soil-borne fungus Pyrenochaeta lycopersici was investigated in organic production systems. The composts evaluated were a green manure compost prepared from red clover, a horse manure compost and two garden waste composts. Composts were mixed (20% v/v) with soil naturally infested with P. lycopersici. Three-week old tomato seedlings were transplanted in compost/soil mix for 10 weeks in the greenhouse to investigate potential suppressive effects of composts on corky root disease. The fungivorous nematodes studied were Aphelenchus avenae and Aphelenchoides spp. The suitability of P. lycopersici as a host for the fungivorous nematodes was determined on agar plates. The effects of the fungivorous nematodes on corky root disease were then investigated by inoculating fungivorous nematodes into Pyrenochaeta-infested soil in greenhouse trials. In addition, fungivorous nematodes were inoculated into the compost-amended infested soils to determine the combined effect of the composts and fungivorous nematodes on corky root disease. Other potential measures for controlling corky root disease, such as use of mulch, break crop, grafted tomato plants, composted Pyrenochaeta-infested soil and commercially available bio-control agents, were evaluated in participation with a group of commercial organic tomato growers. A garden waste compost with low NH4-N concentration and high Ca concentration reduced corky root disease. Populations of the fungivorous nematodes developed well on the culture of P. lycopersici in the in vitro tests. In greenhouse experiments, A. avenae reduced corky root disease severity but Aphelenchoides spp. did not. When A. avenae was applied in a commercial greenhouse soil, however, no disease reduction by this fungivorous nematode was observed. Furthermore, no disease reduction effect was observed with combined application of composts and fungivorous nematodes to Pyrenochaeta-infested soil. Overall, no single treatment provided a sufficiently high degree of corky root disease control to be recommended to growers. The study emphasises the need for integration of different measures to keep corky root disease below an economically tolerable threshold level.

Authors/Creators:Hasna, Mahbuba Kaniz
Title:Corky root disease management in organic tomato production
Subtitle:composts, fungivorous nematodes and grower participation
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2007
Number of Pages:41
ALLI. Hasna, M.K., Mårtensson, A., Persson, P. & Rämert, B. Use of composts to manage corky root disease in organic tomato production. Annals of Applied Biology. In Press. II. Hasna, M.K., Insunza, V., Lagerlöf, J. & Rämert, B. 2007. Food attraction and population growth of fungivorous nematodes with different fungi. Annals of Applied Biology 151, 175-182. III. Hasna, M.K., Lagerlöf, J. & Rämert, B. Effects of fungivorous nematodes on corky root disease of tomato grown in compostamended soil. Acta Agriculturae Scandinavica Section B, Soil and Plant Science. In Press. IV. Hasna, M.K., Ögren, E., Persson, P., Mårtensson, A. & Rämert, B. Management of corky root disease of tomato in participation with organic tomato growers (Manuscript).
Place of Publication:Uppsala
Associated Programs and Other Stakeholders:Z - SLU - Library > Odla mera
ISBN for printed version:978-91-85913-13-8
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:lycopersicon esculentum, organic agriculture, pyrenochaeta, fungal diseases, root rots, aphelenchus avenae, aphelenchoides, biological control, composts
Keywords:Aphelenchus avenae, Aphelenchoides spp., biological control, garden waste compost, green manure compost, horse manure compost, participatory research, Pyrenochaeta lycopersici
Permanent URL:
ID Code:1642
Department:(NL, NJ) > Dept. of Crop Production Ecology
Deposited By: Mahbuba Kaniz Hasna
Deposited On:23 Nov 2007 00:00
Metadata Last Modified:22 Mar 2015 15:11

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