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Influence of Chemical Treatment and Fusarium oxysporum on Velvetleaf (Abutilon theophrasti)

Published online by Cambridge University Press:  12 June 2017

Robert J. Kremer  and
Lisa K. Schulte
Robert J. Kremer
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Crop Syst. Water Qual. Res. Unit, Univ. Mo., Columbia, MO 65211
Lisa K. Schulte
Affiliation:
Dep. Agron., Univ. Mo., Columbia, MO 65211
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Abstract

Germination stimulants were tested for effectiveness on velvetleaf seed imbibition and germination and concurrent microbial attack of seed to deplete weed seed in soil. Several chemicals increased in vitro seed germination and decreased the numbers of hard, viable seed. The proportion of nonviable seed, 5% with Fusarium oxysporum (Schlech.), was enhanced to 40% by adding ethephon at 100 μg/ml. Fungal density on seedling roots and imbibed (nonviable seed) was increased by chemical treatment. Seedling emergence was reduced 15% when ethephon or carbofuran was applied to soil with the fungus. Shoot dry weight decreased and root infection increased with all treatments regardless of fungal inoculation. Butylate and carbofuran increased infection of imbibed seed in soil by F. oxysporum while ethephon and AC94377 increased infection by other soil fungi.

Keywords

AC94377, 1-(3-chlorophthalimido)-cyclohexane carboximidebutylate, S-ethyl bis(2-methylpropyl)carbamothioatecarbofuran, 2,3-dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamateethephon, (2-chloroethyl)phosphonic acidvelvetleaf, Abutilon theophrasti Medik. #3 ABUTHPesticide-microorganism interactionsintegrated weed managementweed biocontrolbutylateethephonAC94377ABUTH
Type
Research
Information
Weed Technology , Volume 3 , Issue 2 , June 1989 , pp. 369 - 374
Copyright
Copyright © 1989 by the Weed Science Society of America 

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