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Herbicide Interactions with Colletotrichum gloeosporioides f. sp. malvae a Bioherbicide for Round-leaved Mallow (Malva pusilla) Control

Published online by Cambridge University Press:  12 June 2017

Nelson T. Grant ,
Elizabeth Prusinkiewicz ,
Knud Mortensen  and
Roberte M. D. Makowski
Nelson T. Grant
Affiliation:
Philom Bios Inc., Saskatoon, SK, Box 440 Regina, SK S4P 3A2, Canada
Elizabeth Prusinkiewicz
Affiliation:
Philom Bios Inc., Saskatoon, SK, Box 440 Regina, SK S4P 3A2, Canada
Knud Mortensen
Affiliation:
Agric. Canada Res. Stn., Box 440 Regina, SK S4P 3A2, Canada
Roberte M. D. Makowski
Affiliation:
Agric. Canada Res. Stn., Box 440 Regina, SK S4P 3A2, Canada
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Abstract

Colletotrichum gloeosporioides f. sp. malvae (C.g.m.) was evaluated under greenhouse conditions for round-leaved mallow control in combination with the following herbicides: bromoxynil plus MCPA (1:1), diclofop, imazethapyr, metribuzin, sethoxydim, and 2,4-DB. Treatments consisted of C.g.m. and herbicide applied alone, tank mixed, and C.g.m. applied 48 h before, and 1, 24, and 72 h after herbicide. Split applications with bromoxynil plus MCPA, imazethapyr, metribuzin, (C.g.m. before or after) and sethoxydim (C.g.m. before) enhanced round-leaved mallow control over C.g.m. applied alone. However, diclofop or 2,4-DB tank mixed or applied in a split application with C.g.m. did not improve round-leaved mallow control over C.g.m. applied alone. Bromoxynil plus MCPA, metribuzin, 2,4-DB, and imazethapyr may be tank mixed with C.g.m. without significantly reducing round-leaved mallow control, unlike sethoxydim or diclofop which inhibited C.g.m. development. Dew period did not influence the effectiveness of bromoxynil plus MCPA applied 30 h before C.g.m., but round-leaved mallow control increased with increasing dew period for metribuzin applied 30 h before C.g.m.

Keywords

Bromoxynil, 3,5-dibromo-4-hydroxybenzonitrile ester of octanoic aciddiclofop, methyl ester of (±)-2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic acidimazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidMCPA, (4-chloro-2-methylphenoxy)acetic acidmetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onesethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one2,4-DB, 4-(2,4-dichlorophenoxy)butanoic acidColletotrichum gloeosporioides (Penz.) Sacc. f. sp. malvae (C.g.m.)3round-leaved mallow, Malva pusilla Sm. ♯4 MALPUBiological weed controlintegrated weed controlmycoherbicidebromoxynildiclofopimazethapyrMCPAmetribuzinsethoxydim2,4-DBMALPU
Type
Feature
Information
Weed Technology , Volume 4 , Issue 4 , December 1990 , pp. 716 - 723
Copyright
Copyright © 1990 Weed Science Society of America 

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