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  • Colorado potato beetle  (1)
  • Curculionidae  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Sampling range of male sweetpotato weevils (Cylas formicarius elegantulus) (Summers) (Coleoptera: Curculionidae) to pheromone traps: Influence of pheromone dosage and lure age (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 2493-2502 
    Details
    ISSN: 1573-1561
    Keywords: Cylas formicarius elegantulus (Summers) ; Coleoptera ; Curculionidae ; sex pheromone ; sweetpotato weevil ; mark-release-recapture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Studies were conducted to determine the effects of sex pheromone dosage and lure age on movement of male sweetpotato weevils (SPW),Cylas formicarius elegantulus (Summers), using mark-release-recapture techniques. SPW trap counts from various downwind distances were compared for dosages ranging from 0.01 to 10.0 μg and lure ages ranging from fresh (0 days old) to 64 days old. The percentages of male SPW recaptured decreased with an increase in release distance and decreased with a decrease in dosage at each corresponding distance. Most SPW were caught within the first 16-hr period. Slopes of percent recapture vs. release distance for the two higher dosages (10 μg and 1.0 μg) differed from those of the two lower dosages (0.1 and 0.01 μg) but did not differ from each other. Intercepts were similar among the three higher dosages. Slopes did not differ among the five lure ages examined. Intercepts differed between fresh (0 days old) and 24-day-old septa at 16 hr and between fresh (0 days old) and 34-day-old septa at 40 hr. Previous exposure to pheromone (conditioning) did not increase percentages of SPW recaptured. Results indicate that male SPW are capable of traversing distances of at least 280 m in 16 hr. The pheromone tested in this study appears to be effective at dosages lower than any other coleopteran sex-pheromone system. Incorporation of this pheromone into a SPW management system may effectively reduce the use of insecticides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01017472
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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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