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Effects of nitrogen availability and spore concentration on the biocontrol activity of Ascochyta caulina in common lambsquarters (Chenopodium album)

Published online by Cambridge University Press:  20 January 2017

P. C. Scheepens
Affiliation:
Department of Crop and Production Ecology, Wageningen University and Research Centre (Wageningen UR), Plant Research International, P.O. Box 16, NL-6700 AA Wageningen, The Netherlands
W. V. D. Zweerde
Affiliation:
Department of Crop and Production Ecology, Wageningen University and Research Centre (Wageningen UR), Plant Research International, P.O. Box 16, NL-6700 AA Wageningen, The Netherlands
C. Leifert
Affiliation:
TESCO Centre for Organic Agriculture, Department of Agriculture, University of Newcastle, King George VI Building, Newcastle Upon Tyne NE1 7RU, U.K.
A. J. S. McDonald
Affiliation:
Department of Plant and Soil Science, University of Aberdeen, Cruickshank Building, St. Machar Drive, Aberdeen AB24 3UU, U.K.
W. Seel
Affiliation:
Department of Plant and Soil Science, University of Aberdeen, Cruickshank Building, St. Machar Drive, Aberdeen AB24 3UU, U.K.

Abstract

Common lambsquarters is an annual weed of many important crops. Ascochyta caulina is a plant pathogenic fungus that causes necrotic lesions on the leaves and stems of common lambsquarters. The objective of the present study was to estimate the effect of plant N supply on the biocontrol activity of A. caulina isolates against common lambsquarters. In greenhouse experiments replicated groups of common lambsquarters plants raised with different N supplies were sprayed with various isolates and concentrations of A. caulina 3 wk after planting. Height, number of leaves, total leaf area, fresh and dry weight, and tissue N concentration of common lambsquarters 4 wk after emergence increased significantly with increasing N supply. Disease development was positively related to increasing plant tissue N and also to increasing spore concentration. Fungal spore concentration also had a positive effect on the plant tissue N percentage. Ascochyta caulina isolate W90-1 caused a greater dry weight reduction in common lambsquarters than isolates I-001 and NW-6 did.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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