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

Lookup NU author(s): Dr Reza Ghorbani, Professor Carlo Leifert

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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.


Publication metadata

Author(s): Ghorbani R, Scheepens PC, Zweerde WVD, Leifert C, McDonald AJS, Seel W

Publication type: Article

Publication status: Published

Journal: Weed Science

Year: 2002

Volume: 50

Issue: 5

Pages: 628-633

Print publication date: 01/01/2002

ISSN (print): 0043-1745

ISSN (electronic): 1550-2759

Publisher: Weed Science Society of America

URL: http://dx.doi.org/10.1614/0043-1745(2002)050[0628:EONAAS]2.0.CO;2

DOI: 10.1614/0043-1745(2002)050[0628:EONAAS]2.0.CO;2


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