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  • Blackwell Publishing Ltd  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 17 (1977), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Actuarial data on the progress through the life-cycle and the death of individual plants of Senecio jacobaea in permanent pasture were obtained over a period of one year by repeated mapping of all the plants in twenty permanent quadrats. The data were used to construct a model of population flux and mortality in a hypothetical population in which germination, maturation and death were constant from year to year and equal to those in the real population in the year of study. In the hypothetical population 57% of all plants died as seedlings. 35% as vegetative rosettes and 8% immediately after flowering. Of plants which flowered in the first 2 years or survived into a third year 8% were annuals or winter annuals, 39% were biennials and 53% were perennials.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 17 (1977), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Infestations of marsh ragwort, Senecio aquaticus Huds., in established ley grassland were sprayed at the rosette stage in April or May with MCPA, 2,4-D, asulam or a 2,4-D asulam mixture. All treatments gave better control in the year after spraying than in the year of spraying. The most effective herbicide was 2,4-D ester at 1–68 or 1–12 kg/ha with or without the incorporation of asulam at 1–12 kg/ha. MCPA at 1–68 kg/ha was less effective, especially in the year of spraying and asulam alone at 1-12 kg/ha gave consistently the poorest control of all treatments. Spraying in May gave better control in the year of spraying than April application, but in the year after spraying date of application made no difference to the degree of control. S. aquaticus at the various sites differed in general susceptibility to herbicides in the year of spraying, but in the year after spraying these differences disappeared.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 18 (1978), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A range of herbicides was sprayed in October 1976 or May 1977 on grassland infested with S. jacobaea. Control, measured by reduction in the number of flowering stems in July 1977, was extremely good with all herbicides, October spraying gave 99% control of 5. jacohaea and is provisionally recommended for grassland which is to be cut for silage. Lutte contre Senecio jacobaea L. (séneçonjacobée) parun traitement herbicide d'automne ou de printempsUne série d'herbicides ont été appliqués en octobre 1976 ou en mai 1977 sur des herbages infestés de séneçon jacobée. L'éfficacité, mesurée par la réduction du nombre de tiges fleuries en juillet 1977, a été extrêmement bonne avec tous les herbicides. Le traitement d'octobre a détruit 99% de S. jacobaea; il est provisoirement recommande pour les prairies de fauche dont la recolte doit etre ensilee. Bekümpfung von Senecio jacobaea L. (Jakohs-Kreuzkraut) durch Herbizidanwendung im Herbst oder FrühjahrAuf Grünland, das mit Jakobs-Kreuzkraut verseucht war, wurde eine Reihe von Herbiziden im Oktober 1976 oder im Mai 1977 eingesetzt. Die Bekämpfung, gemessen am Rückgang blühender Pflanzen im Juli 1977, war mit alien Herbiziden äusserst zufriedenstellend. Die Spritzung im Oktober ergab für S. jaco baea einen Bekämpfungsgrad von 99% und wird für Grünland, das für Silagegewinnung genutzt wird, vorläufig empfohlen.
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