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  • 1
    Electronic Resource
    Electronic Resource
    Effects of nitrogen and foliar biomass on population parameters of cabbage insects (1991)
    Springer
    Entomologia experimentalis et applicata 61 (1991), S. 7-16 
    Details
    ISSN: 1570-7458
    Keywords: Plutella xylostella ; Trichoplusia ni ; Hellula phidilealis ; Artogeia rapae ; nitrogen ; population growth ; cabbage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of different nitrogen (N) fertilization rates (0, 45, 90, and 168 kg N/ha), plant nitrogen concentration, and plant biomass on abundance and population growth of diamondback moth, Plutella xylostella (L.), cabbage looper, Trichoplusia ni (Hübner), cabbage budworm, Hellula phidilealis (Walker), imported cabbageworm, Artogeia rapae (L.), and cross-striped cabbageworm, Evergestis rimosalis (Guenée), were investigated in Homestead and Sanford, Florida in 1987. The effects of these factors on the parasitization of P. xylostella were also examined. In Homestead, abundance of most insect pests and parasitized P. xylostella increased with an increase in the level of N applied and with an increase in plant biomass. Similar results were found in Sanford, although results were not consistently significant. Abundance of most insect pests was significantly positively correlated with plant N concentration. Multiple regression analyses indicated that foliar biomass was significantly more important than N fertilization rate and subsequent plant N concentration at predicting abundance of insect pests and parasitized P. xylostella on cabbage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367163
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  • 2
    Electronic Resource
    Electronic Resource
    Parasitism ofLeptinotarsa decemlineata [Coleoptera: Chrysomelidae] byEdovum puttleri [Hymenoptera: Eulophidae] in different cultivars of eggplant (1987)
    Springer
    BioControl 32 (1987), S. 503-510 
    Details
    ISSN: 1573-8248
    Keywords: Colorado potato beetle ; Leptinotarsa decemlineata ; Edovum puttleri ; eggplant ; biological control ; Doryphore ; Leptinotarsa decemlineata ; Edovum puttleri ; aubergine ; lutte biologique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé En vue de quantifier le parasitisme Du Doryphore,Leptinotarsa decemtineata (Say) par le parasitoïde oophageEdovum puttleri Grissell, des expériences furent conduites sur trois différents cultivars d'aubergine,Solanum melongena L. Les niveaux de parasitisme étaient plus élevés (P〈0.05) sur «Black Pride» que sur les autres cultivars. Le pourcentage des pontes parasitées était 1,2 fois plus élevétés par ponte était 1,3 et 1,4 fois plus grant (P〈0.05) sur «Black Price» que sur «Harris Spccial» et «White» respectivement. Le pourcentage d'œufs parasités par ponte et le pourcentage de parasitoïdes adultes émergeant ne variaient pas (P〉0.05) entre les cultivars et s'établissait en moyenne entre 47 et 55 et 73 et 79% respectivement sur tous les cultivars. Les sex-ratio des parasitoïdes éclos ne différaient pas (P〉0.05) entre les cultivars; entre 2,1 et 2,6 fois plus de femelles que de mâles émergeaient des œufs sur tous les cultivars durant la saison-Edovum puttleri supprimait la deuxième génération deL. decemlineata sur «Black Pride» et «Harris Special», mais ne la supprimait pas sur «White».
    Notes: Abstract Experiments were conducted to quantify parasitism of Colorado potato beetle,Leptinotarsa decemlineata (Say), by the egg parasitoid,Edovum puttleri Grissell, on 3 different cultivars of eggplant,Solanum melongena L. Levels of parasitism were higher (P〈0.05) on ‘Black Pride’ than on other cultivars. The percentage of egg masses that were parasitized was 1.2-fold higher (P〈0.05) on ‘Black Pride’ than on ‘Harris Special’ and ‘White’. The number of eggs per mass that were parasitized was 1.3- and 1.4- fold greater (P〈0.05) on ‘Black Pride’ than on ‘Harris Special’ and ‘White’, respectively. The percentage of eggs that were parasitized per mass and percentage of emerged adult parasitoids did not differ (P〉0.05) among cultivars; between 2.1- to 2.6- fold more females than males emerged from eggs on all cultivars during the growing season.Edovum puttleri suppressed the 2nd generation ofL. decemlineata on ‘Black Pride’ and ‘Harris Special’, but did not suppress populations on ‘White’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02373519
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