Effects of Light Quantities and Glucose on 2,4-D Toxicity to Canada Thistle

Erickson, Duane H.; Erickson, Louis C.; Seely, C. I.

doi:10.1017/s0043174500035918

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…Both grass species were grown at diflerent light intensities by putting the pots into wooden shade cages, 1 2 X 10m and with a height of 1 0 m, after a method described by Erickson, Erickson & Seely (1972). At a space between the wood laths equal to the width ofthe laths (3 5 cm), the light quantity inside the cage was 50% of full daylight.…”

Section: Methodsmentioning

confidence: 99%

Growth of Elymus repens (L.) Gould and Agrostis gigantea Roth. at different light intensities

Skuterud

1984

Weed Research

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Summary Elymus repens (L.) Gould and Agrostis gigantea Roth. raised from rhizomes both responded to reduced light intensity by increased stem length, while the number of aerial shoots was reduced. The weight of the aerial parts was not influenced by a 50% reduction of the daylight intensity, but a further reduction of light caused a significant decrease in weight. The production of new rhizomes was more influenced by shading than were the aerial shoots. The consequence was an increase in the shoot/rhizome ratio. The food reserve per bud measured as inter‐node weight in E. repens and A. gigantea was reduced only with intensive shading, and the vitality of the rhizomes appeared independent of light intensity. Intensive shading in early as compared to late summer caused a reduction in the number and weight of aerial shoots, but not in the weight of new rhizomes. Light intensities equal to those found in a spring wheat crop allowed more E. repens growth than light intensities equal to those in a spring oat crop. E. repens raised from seeds and grown at light intensities equal to those found in a cereal crop, showed insignificant rhizome production.

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Section: Methodsmentioning

confidence: 99%

Growth of Elymus repens (L.) Gould and Agrostis gigantea Roth. at different light intensities

Skuterud

1984

Weed Research

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Effect of climatic factors on the potency of ioxynil and bromoxynil

1975

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Outdoor pot experiments, carried out between 1967 and 1971, mainly with Polygonum lapathifolium L. and Stellaria media (L.) Vill., showed that herbicidal potency of ioxynil and bromoxynil salts and esters was affected by climatic conditions, particularly solar radiation and relative humidity. Multiple regression equations were frequently obtained which accounted for 80% or more of the observed variation in effective dose (ED90). By contrast, experiments in growth cabinets suggested that air temperature was the most important climatic variable; the reasons for this disagreement are discussed. It is concluded that climatic factors affect the potency of ioxynil and bromoxynil via their influence on leaf uptake; ester formulations (emulsions) were much less affected than aqueous salt solutions.

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Factors affecting glyphosate activity in Imperata cylindrica (L.) Beauv. and Cyperus rotundus L. II: effect of shade

Moosavi-Nia

Doré

1979

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Summary: Imperata cylindrica and Cyperus rotundus were grown under three different light regimes; unshaded, 50% shade, and 75% shade and no shade plus 75% shade before and after spraying, (temporary shade) in a heated greenhouse. Six weeks after the start of the experimenis, glyphosate was applied to the plants at 0·2, 0·4 and 0·8 kg/ha (for Imperata) or 0·3, 0·6 and 1·2 kg/ha (for Cyperus). Glyphosate toxicity was enhanced as shade increased. In Imperata, all shade regimes at all rates of glyphosate eaused greater damage to the plants than the unshaded regime. The reduction in shoot dry weight, rhizome dry weight and total carbohydrate content of Imperate rhizotties at 75% continuous and temporary shaiie conditions, with the lowest rate of glyphosate, was almost twice as much as the reduction in the same features m the unshaded plants caused by the highest rate of glyphosate. In Cyperus. glyphosate at the intermediate and highest rates decreased the shoot dry weight at 75% continuous shade by 79% and 98% respectively. Plants in 50% shade were significantly affected only at the highest rate of glyphosate. Sprouting ability of the tubers al 75% continuous shade was inhibited when the tubers were replanted for recovery. Enhanced toxicity of glyphosate in reduced light intensity was attributed to the morphological changes in the nature of the leaves caused by shade.

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Effects of Light Quantities and Glucose on 2,4-D Toxicity to Canada Thistle

Cited by 3 publications

References 8 publications

Growth of Elymus repens (L.) Gould and Agrostis gigantea Roth. at different light intensities

Growth of Elymus repens (L.) Gould and Agrostis gigantea Roth. at different light intensities

Effect of climatic factors on the potency of ioxynil and bromoxynil

Factors affecting glyphosate activity in Imperata cylindrica (L.) Beauv. and Cyperus rotundus L. II: effect of shade

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