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Efficacy Comparison of Some New Natural-Product Herbicides for Weed Control at Two Growth Stages

Published online by Cambridge University Press:  20 January 2017

Hussein F. H. Abouziena ,
Ahmad A. M. Omar ,
Shiv D. Sharma  and
Megh Singh
Hussein F. H. Abouziena*
Affiliation:
Botany Department, National Research Centre, Dokki, Cairo, Egypt
Ahmad A. M. Omar
Affiliation:
Biochemistry Department, College of Agriculture, Zagazig University, Zagazig 44111, Egypt Institute of Food and Agriculture Science, Horticultural Sciences Department, Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL 33850-2299
Shiv D. Sharma
Affiliation:
Institute of Food and Agriculture Science, Horticultural Sciences Department, Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL 33850-2299
Megh Singh
Affiliation:
Institute of Food and Agriculture Science, Horticultural Sciences Department, Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL 33850-2299
*
Corresponding author's E-mail: abouzainah@yahoo.com.
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Abstract

There is an urgent need to accelerate the development and implementation of effective organic-compliant herbicides that are environmentally safe and that help the producer meet increasing consumer demand for organic products. Therefore, greenhouse experiments were conducted to evaluate the effectiveness of acetic acid (5%), acetic acid (30%), citric acid (10%), citric acid (5%) + garlic (0.2%), citric acid (10%) + garlic (0.2%), clove oil (45.6%), and corn gluten meal (CGM) compounds as natural-product herbicides for weed control. The herbicides were applied to the broadleaf weeds stranglervine, wild mustard, black nightshade, sicklepod, velvetleaf, and redroot pigweed and to narrowleaf weeds crowfootgrass, Johnsongrass, annual ryegrass, goosegrass, green foxtail, and yellow nutsedge. The herbicides were applied POST at two weed growth stages, namely, two to four and four to six true-leaf stages. CGM was applied PPI in two soil types. Citric acid (5%) + garlic (0.2%) had the greatest control (98%) of younger broadleaf weeds, followed by acetic acid (30%) > CGM > citric acid (10%) > acetic acid (5%) > citric acid (10%) + garlic (0.2%), and clove oil. Wild mustard was most sensitive to these herbicides, whereas redroot pigweed was the least sensitive. Herbicides did not control narrowleaf weeds except for acetic acid (30%) when applied early POST (EPOST) and CGM. Acetic acid (30%) was phytotoxic to all broadleaf weeds and most narrowleaf weeds when applied EPOST. Delayed application until the four- to six-leaf stage significantly reduced efficacy; acetic acid was less sensitive to growth stage than other herbicides. These results will help to determine effective natural herbicides for controlling weeds in organic farming.

Keywords

Acetic acidcitric acidcitric acid (5%) + garlic (0.2%; Alldown)citric acid (10%) + garlic (0.2%; Groundforce)clove oil (45.6%; Matran II)corn gluten meal (CGM)annual ryegrass, Lolium multiflorum Lamblack nightshade, Solanum nigrum L.crowfootgrass, Dactyloctenium aegyptium (L.) Willdgoosegrass, Eleusine indica (L.) Gaertngreen foxtail, Setaria viridis (L.) BeauvJohnsongrass, Sorghum halepense (L.) Persredroot pigweed, Amaranthus retroflexus L.sicklepod, Senna obtusifolia (L.) H. S. Irwin & Barnebystranglervine, Morrenia odorata (Hook. & Arn.) Lindlvelvetleaf, Abutilon theophrasti Medikwild mustard, Brassica kaber (DC.) L. S. Wheeleryellow nutsedge, Cyperus esculentus Lclove, Syzygium aromaticum (L.) Merr. & L. M. Perrycorn, Zea mays L.garlic, Allium sativum L.Acetic acidAlldownbroadleaf weedscitric acidclove oilcorn gluten meal (CGM)GroundforceMatran IInarrowleaf weedssoil typevinegaryoung weeds
Type
Weed Management—Techniques
Information
Weed Technology , Volume 23 , Issue 3 , September 2009 , pp. 431 - 437
Copyright
Copyright © Weed Science Society of America 

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