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  • 1980-1984  (4)
  • 1
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Les effets toxiques de 10 pesticides sur 3 espèces de typhlodromes,Typhlodromus pyri Scheuten,Amblyseius potentillae Garman etA. bibens Blommers ont été examinés afin de déterminer si on peut employer ou nonA. bibens à la place des 2 autres espèces en tant qu'espèce test pour la mesure des effets nocifs des pesticides. t. pyri etA. potentillae sont d'importants prédateurs d'acariens phytophages en vergers. Ces espèces peuvent être élevées sur l'acarien commun,Tetranychus urticae Koch, mais présentent des réactions de répulsion à la soie de ce tetranyque. Placés sur des feuilles de haricot plantées dans du coton humide avecT. pyri comme proie, ces typhlodromes ont tendance à quitter les feuilles, surtout si elles ont été traitées par des pesticides.A. bibens, par contre, demeure sur les feuilles en présence de la proie et semble attiré par le tissage de l'acarien. Ce fait rend intéressantA. bibens. Dans ce travail les 3 espèces ont été étudiées comparativement dans des cellules fermées, afin de montrer si elles font preuve de différences dans leur sensibilité intrinsèque aux pesticides, d'après la mortalité des adultes, la reproduction et la mortalité des œufs et des jeunes. On a trouvé queA. bibens peut très bien remplacer les autres typhlodromes comme espèce-test.
    Notes: Abstract Toxicological responses to 10 different pesticides were determined for 3 species of typhlodromid mites,Typhlodromus pyri Scheuten,Amblyseius potentillae Garman, andA. bibens Blommers, in order to investigate whether or notA. bibens might be used as a substitute for the 2 other species as a testing object for measuring adverse effects of pesticides. T. pyri andA. potentillae are important predators in orchards on phytophagous mites. These species can be reared on the common spider mite,Tetranychus urticae Koch, but they seem averse to the webbing of the spider mite. When placed on detached bean leaves on moist cotton wool withT. urticae present as prey, these typhlodromids tend to run off the leaves, especially when in addition such leaves have been treated with pesticides.A. bibens on the other hand will stay on the leaves when prey is present; it seems to be attracted by the webbing of the spider mite. This makesA. bibens an attractive testing object. In the present study the 3 species mentioned were tested comparatively in closed cells to see whether or not there might be differences in intrinsic susceptibility to pesticides. Mortality of adults, the effect on reproduction, and the mortality of eggs and juveniles were determined. It was found thatA. bibens can reasonably well replace other typhlodromids as a testing objeot for obtaining information on adverse effects of pesticides in orchards.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Une méthode pour étudier les actions secondaires des pesticides sur l'acarien prédateurAmblyseius potentillae Garman en laboratoire est présentée. La méthode est fondée sur des règles du groupe du travail de l'OILB/SROP «Pesticides et arthropods utiles». Les actions secondaires de 20 pesticides commerciaux (10 insecticides/acaricides, 6 fongicides, 4 herbicides) sur l'acarien prédateur ont été étudiées en contribution à un programme commun d'essais de pesticides par ce groupe de travail.
    Notes: Abstract A method is described for testing adverse effects of pesticides on the predacious miteAmblyseius potentillae Garman in the laboratory. It complies with the terms of the W.P.R.S./I.O.B.C. Working Group “Pesticides and Beneficial Arthropods” with respect to such methods. Twenty commercial pesticides were tested on the predator as part of a joint pesticide test programme of the Working Group.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The phytoseiid mite Amblyseius potentillae is a predator of spider mites in apple orchards in the Netherlands, but in the laboratory it may be successfully reared on a vegetarian diet of pollen. No differences in growth and reproduction were observed between mites fed on spider mite prey and mites ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    De economist 130 (1982), S. 38-70 
    ISSN: 1572-9982
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Summary An attempt has been made to estimate a putty-clay vintage model for the Netherlands in order to test the assumption, usually made in the Dutch vintage model discussion, of complementarity ex ante. The estimation led to the following conclusions: an elasticity of substitution of about 0.32, a planning period of 13 years and apart from the 1950s the existence of embodied labour-augmenting technical progress only. The model outcomes lead to the conclusion of capital shortage being the ruling phenomenon in the postwar period with only some short periods in the 1950s and the late-1960s of capital abundance. Since the late-1970s employment growth is not only depressed by too slow a growth of capacity demand for labour but also by the increasing underutilization of productive capacity.
    Type of Medium: Electronic Resource
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