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Growth and Competitiveness of Common Lambsquarters (Chenopodium album) after Foliar Application of Ascochyta caulina as a Mycoherbicide

Published online by Cambridge University Press:  12 June 2017

Corné Kempenaar ,
Petra J. F. M. Horsten  and
Piet C. Scheepens
Corné Kempenaar
Affiliation:
Res. Inst. for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, 6700 AA Wageningen, The Netherlands
Petra J. F. M. Horsten
Affiliation:
Res. Inst. for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, 6700 AA Wageningen, The Netherlands
Piet C. Scheepens
Affiliation:
Res. Inst. for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, 6700 AA Wageningen, The Netherlands
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Abstract

Control of common lambsquarters by the use of Ascochyta caldina as a postemergence mycoherbicide was studied in corn and sugar beet, in 1992 or 1993. The weed was planted at determined positions in the crops. Plots were treated with suspensions of A. caulina spores, and wetness duration's were varied to create different levels of disease development. Application of A. caulina resulted in necrosis development on, and mortality of common lambsquarters. Average severities of leaf necrosis 1 wk after treatment ranged from 0.01 to 0.75. Average proportions of dead plants 3 wk after treatment ranged from 0.00 to 0.65. Necrosis development and mortality were affected by wetness duration in two experiments. Sublethally diseased plants showed reduced growth. Maximum dry matter was affected by crop and by necrosis development. Numbers of fruits per plant showed a positive, almost linear relationship with plant dry matter weight. Seed weight was less affected by necrosis than number of fruits per plant. Competitiveness of common lambsquarters was reduced after infection by A. caulina. Crop dry matter weight showed a positive relationship with the level of common lambsquarters control. In corn, yield reduction by competition was prevented by application of A. caulina, but not in sugar beet.

Keywords

Common lambsquarters, Chenopodium album L. ♯ CHEALCorn, Zea mays L.Sugar beet, Beta vulgaris subspecies vulgaris L.Ascochyta caulina v.d. Aa & v. KestBiological controlweed controlcompetitionpropagationCHEALintegrated pest management
Type
Weed Management
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 609 - 614
Copyright
Copyright © 1996 by the Weed Science Society of America 

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