Influence of Physical Spray Characteristics and Presence of Glyphosate in Enhancing the Performance of Metsulfuron-Methyl Against Woody Borreria (Diodia Ocimifolia)

Influence of physical spray characteristics (carrier volume, herbicide dosage and surfactant) and presence of glyphosate on the performance of metsulfuron-methyl against woody borreria (Diodia ocimifolia) was studied in the glass house. The activity of metsulfuron-methyl on Diodia ocimifolia was...

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Main Author:	Ooi, Kok Eng
Format:	Thesis
Language:	English English
Published:	1999
Subjects:	Glyphosate Hardwood
Online Access:	http://psasir.upm.edu.my/id/eprint/10443/1/FP_1999_21_A.pdf
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id	my-upm-ir.10443
record_format	uketd_dc
spelling	my-upm-ir.104432011-04-14T08:28:29Z Influence of Physical Spray Characteristics and Presence of Glyphosate in Enhancing the Performance of Metsulfuron-Methyl Against Woody Borreria (Diodia Ocimifolia) 1999-01 Ooi, Kok Eng Influence of physical spray characteristics (carrier volume, herbicide dosage and surfactant) and presence of glyphosate on the performance of metsulfuron-methyl against woody borreria (Diodia ocimifolia) was studied in the glass house. The activity of metsulfuron-methyl on Diodia ocimifolia was influenced by herbicide dosage, carrier volume, surfactant and the interaction of these factors. The performance of metsulfuron-methyl increased as herbicide dosage increased irrespective of carrier volume. The results indicated that 30 g/ha metsulfuron-methyl was required for effective control of Diodia. A significant decrease in performance of metsulfuron-methyl was observed as the carrier volume increased from 200 to 600 L ha-1. The presence of surfactant increased the activity of metsulfuron-methyl against Diodia at carrier volu mes of 400 and 600 L ha-1 • However, the results did not indicate loss in herbicide performance for carrier volume less than 200 L ha-1 in the absence and presence of surfactant. These observed responses were further illustrated using models obtained by linear regression analysis. Metsulfuron-methyl applied to D. ocimifolia at both growth stages caused seedling mortal ity and reduced seed production. Diodia ocimifolia was more susceptibie at the vegetative stage compared to the flowering stage. Shoot tip growth was arrested at low dosage of 3.75 g/ha. However, metsulfuron-methyl dosage required for complete kill of Diodia seedlings was 15 g/ha at the vegetative stage and 30 g/ha at the flowering stage. Metsulfuron-methyl applied at the flowering stage caused flower abscission but did not inhibit germination of seeds collected from treated plants. Metsulfuron-methyl and glyphosate mixtures at all ratios were more effective than the herbicides used alone. At low rates of metsulfuron-methyl (3.75 and 15 g/ha), the response in the presence of glyphosate (135 and 540 g/ha) with and without surfactant (1:36 mixtures) was synergistic or additive. However, in the 1:72 mixture the interaction response became additive. The same response was obtained with the 1:18 mixture. The results indicate that the appropriate combination for optimum performance is the 1:36 mixture both in the presence and absence of surfactant. Glyphosate Plants, Effect of glyphosate on Hardwood 1999-01 Thesis http://psasir.upm.edu.my/id/eprint/10443/ http://psasir.upm.edu.my/id/eprint/10443/1/FP_1999_21_A.pdf application/pdf en public masters Universiti Putra Malaysia Glyphosate Plants, Effect of glyphosate on Hardwood Faculty of Agriculture English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Glyphosate Glyphosate Hardwood
spellingShingle	Glyphosate Glyphosate Hardwood Ooi, Kok Eng Influence of Physical Spray Characteristics and Presence of Glyphosate in Enhancing the Performance of Metsulfuron-Methyl Against Woody Borreria (Diodia Ocimifolia)
description	Influence of physical spray characteristics (carrier volume, herbicide dosage and surfactant) and presence of glyphosate on the performance of metsulfuron-methyl against woody borreria (Diodia ocimifolia) was studied in the glass house. The activity of metsulfuron-methyl on Diodia ocimifolia was influenced by herbicide dosage, carrier volume, surfactant and the interaction of these factors. The performance of metsulfuron-methyl increased as herbicide dosage increased irrespective of carrier volume. The results indicated that 30 g/ha metsulfuron-methyl was required for effective control of Diodia. A significant decrease in performance of metsulfuron-methyl was observed as the carrier volume increased from 200 to 600 L ha-1. The presence of surfactant increased the activity of metsulfuron-methyl against Diodia at carrier volu mes of 400 and 600 L ha-1 • However, the results did not indicate loss in herbicide performance for carrier volume less than 200 L ha-1 in the absence and presence of surfactant. These observed responses were further illustrated using models obtained by linear regression analysis. Metsulfuron-methyl applied to D. ocimifolia at both growth stages caused seedling mortal ity and reduced seed production. Diodia ocimifolia was more susceptibie at the vegetative stage compared to the flowering stage. Shoot tip growth was arrested at low dosage of 3.75 g/ha. However, metsulfuron-methyl dosage required for complete kill of Diodia seedlings was 15 g/ha at the vegetative stage and 30 g/ha at the flowering stage. Metsulfuron-methyl applied at the flowering stage caused flower abscission but did not inhibit germination of seeds collected from treated plants. Metsulfuron-methyl and glyphosate mixtures at all ratios were more effective than the herbicides used alone. At low rates of metsulfuron-methyl (3.75 and 15 g/ha), the response in the presence of glyphosate (135 and 540 g/ha) with and without surfactant (1:36 mixtures) was synergistic or additive. However, in the 1:72 mixture the interaction response became additive. The same response was obtained with the 1:18 mixture. The results indicate that the appropriate combination for optimum performance is the 1:36 mixture both in the presence and absence of surfactant.
format	Thesis
qualification_level	Master's degree
author	Ooi, Kok Eng
author_facet	Ooi, Kok Eng
author_sort	Ooi, Kok Eng
title	Influence of Physical Spray Characteristics and Presence of Glyphosate in Enhancing the Performance of Metsulfuron-Methyl Against Woody Borreria (Diodia Ocimifolia)
title_short	Influence of Physical Spray Characteristics and Presence of Glyphosate in Enhancing the Performance of Metsulfuron-Methyl Against Woody Borreria (Diodia Ocimifolia)
title_full	Influence of Physical Spray Characteristics and Presence of Glyphosate in Enhancing the Performance of Metsulfuron-Methyl Against Woody Borreria (Diodia Ocimifolia)
title_fullStr	Influence of Physical Spray Characteristics and Presence of Glyphosate in Enhancing the Performance of Metsulfuron-Methyl Against Woody Borreria (Diodia Ocimifolia)
title_full_unstemmed	Influence of Physical Spray Characteristics and Presence of Glyphosate in Enhancing the Performance of Metsulfuron-Methyl Against Woody Borreria (Diodia Ocimifolia)
title_sort	influence of physical spray characteristics and presence of glyphosate in enhancing the performance of metsulfuron-methyl against woody borreria (diodia ocimifolia)
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Agriculture
publishDate	1999
url	http://psasir.upm.edu.my/id/eprint/10443/1/FP_1999_21_A.pdf
_version_	1747811123116113920

Influence of Physical Spray Characteristics and Presence of Glyphosate in Enhancing the Performance of Metsulfuron-Methyl Against Woody Borreria (Diodia Ocimifolia)

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