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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| Format: | Thesis |
| Language: | English English |
| Published: |
1999
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10443/1/FP_1999_21_A.pdf |
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| Summary: | 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. |
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