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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

R. Ghorbani ,
P. C. Scheepens ,
W. V. D. Zweerde ,
C. Leifert ,
A. J. S. McDonald  and
W. Seel
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.
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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.

Keywords

Ascochyta caulina (P. Karst) v.d. Aa & v Kest.common lambsquarters, Chenopodium album L. CHEALBiological controlbioherbicidedose responsemycoherbicidespore inocula
Type
Research Article
Information
Weed Science , Volume 50 , Issue 5 , October 2002 , pp. 628 - 633
Copyright
Copyright © Weed Science Society of America 

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