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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 217 (1973), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    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: Summary Infection of larvae ofTrichoplusia ni (Hübner) byVairimorpha, (=Nosema) necatrix was classified as chronic, semi-chronic and acute symptoms depending on the quantity of spores (5 to 500, 5×103 to 5×105, and 5×106 per larva, respectively) ingested per larva.V. necatrix infects mainly the fat body and some muscle tissue of larvae with chronic symptoms and mainly midgut tissue of larvae with acute symptoms.V. necatrix caused death in 3 to 4.5 days when a larva ingested 5×106 spores. The histopathology of the disease was studied.
    Notes: Résumé Les larves deTrichoplusia ni (Hübner) infectées parVairimorpha (=Nosema) necatrix (Kramer) présentent des symptômes chroniques, semi-chroniques et aigus selon les doses de spores deV. necatrix (5 à 500, 5.103 à 5.105 et 5.106 par larve, respectivement) ingérées par larve.V. necatrix parasite principalement le corps adipeux et les tissus des muscles quand les larves ont des symptômes chroniques, tandis que les larves manifestent les symptômes aigus lorsque les microsporidies attaquent principalement l’intestin moyen. L’histopathologie de la maladie est étudiée.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-8248
    Keywords: Cydia pomonella ; granulosis virus ; apples ; microbiological control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Cydia pomonella (L.), un ravageur important du pommier dans les vergers canadiens, est sensible au virus de la granulose. Des essais en vergers utilisant deux préparations de ce virus en Ontario, oùC. pomonella présente deux generations par année, indiquent qu'il faudrait jusqu'à sept pulvérisations pour maintenir à moins de 40% la proportion de fruits portant des infestations larvaires. En Nouvelle Ecosse, oùC. pomonella ne compte qu'une seule génération par an, deux pulvérisations furent nécessaires, quoique dans certains cas une seule a suffi. Dans certains essais, le niveau de protection des fruits égalait celui fourni par les esters phosphoriques, l'azinphos-méthyle ou le phosmet. On discute des avantages des traitements sélectifs tels que le virus de la granulose en comparaison avec l'emploi des insecticides de grande polyvalence.
    Notes: Abstract Cydia pomonella (L.), a major pest of apples in Canadian orchards, is susceptible to a granulosis virus (CpGV). Orchard trials with different formulations of CpGV in Ontario, whereC. pomonella has two generations per year, indicated that as many as seven applications of virus would be needed to maintain the percentage of fruit with deep larval entries below 4%. In Nova Scotia, where there is only one generation ofC. pomonella per year, two applications of CpGV usually were needed although, in some cases, one sufficed. The protection of fruit conferred by CpGV equalled that by the organophosphate insecticides, azinphosmethyl or phosmet, in some tests. The advantages of a selective treatment, such as CpGV, over use of broad-spectrum insecticides are discussed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé L'efficacité de la protection des pommes contre le carpocapse,Laspeyresia pomonella (L.), par des applications du virus de la granulose deL. pomonella a été évaluée par des assais dans 4 vergers du Canada entre 1974 et 1978. Des pulvérisations contenant de 3×109 à 4×1010 granules/litre, appliquées 2 ou 3 fois par génération de larves du carpocapse des pommes, ont réduit les dommages aux pommes de 44 à 85% comparé à des réductions de 72 à 98% obtenues avec des pulvérisations d'azinphos-méthyl ou de phosmet. Les applications de virus n'ont pas réduit les populations d'arthropodes prédateurs d'insectes nuisibles et d'acariens.
    Notes: Abstract The protection of apples against damage by the codling moth,Laspeyresia pomonella (L.), by applications of the granulosis virus ofL. pomonella was assessed in apple orchard tests at 4 locations in Canada in 1974–1978. Sprays containing 3×109 to 4×1010 granules/litre, applied 2 or 3 times per generation of codling moth larvae, reduced injury to apples by 44 to 85% compared to reductions of 72 to 98% by applications of azinphos-methyl or phosmet. Applications of the virus did not reduce numbers of arthropods predaceous on pest insects and mites.
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 1959-08-01
    Description: Nitrification in Fox Sandy Loam was studied using the soil percolation technique. The formation of nitrate from ammonium sulphate was inhibited for about 20 days by 1.6 × 10−3moles of thiourea/kgm. of soil, for 8 days by 1.6 × 10−2moles of ethyl urethane/kgm. of soil, for 25 and 17 days by 2.1 × 10−4moles of manzate and zineb/kgm. of soil respectively, and for 28 days by 3.5 × 10−4moles of ferbam/kgm. of soil. Thiourea and ethyl urethane were less effective inhibitors of the nitrification of ammonia added as ammonium carbonate, possibly because of the more alkaline pH in percolates containing this salt. The four dithiocarbamate fungicides caused a lag in nitrification of 150 days when added to percolation units at a concentration of 2.1 × 10−3moles/kgm. of soil.The investigations indicated that treatment of soil with ferbam inhibited the nitrite-oxidizing bacteria as well as the ammonium-oxidizing organisms.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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