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  • 1
    Electronic Resource
    Electronic Resource
    Infestation of maize by Prostephanus truncatus initiated by male-produced pheromone (1997)
    Springer
    Entomologia experimentalis et applicata 83 (1997), S. 53-61 
    Details
    ISSN: 1570-7458
    Keywords: larger grain borer ; Prostephanus truncatus ; Bostrichidae ; pheromone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Delta traps baited with maize cobs, which were infested each with one male Prostephanus truncatus (Horn) (Col.: Bostrichidae), were distributed in southern Benin and collected after one, two, three and four weeks. The numbers of P. truncatus caught during the different trapping periods were not significantly different. Sixty-four percent of the trapped P. truncatus were females. Females attracted during the one-week trapping period produced a mean of 6.9 progeny during the seven days. The sex ratio of the progeny was 1:1. Trap catches with the infested cobs were on average 13 times lower than catches with 2 mg of the artificial pheromone. Estimation of P. truncatus densities in a maize store at the beginning of the storage period (based on laboratory data) revealed that small initial numbers of P. truncatus, possibly attracted by a single male, sufficed to initiate high infestation rates later in the storage season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002919705200
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  • 2
    Electronic Resource
    Electronic Resource
    Flight initiation in Prostephanus truncatus: influence of population density and aggregation pheromone (1997)
    Springer
    Entomologia experimentalis et applicata 85 (1997), S. 237-245 
    Details
    ISSN: 1570-7458
    Keywords: Prostephanus truncatus ; Bostrichidae ; dispersal ; pheromone ; crowding effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of population density and aggregation pheromone were investigated as possible flight initiating factors for Prostephanus truncatus (Horn) (Col.: Bostrichidae). Maize grains (175 g in glass jars) were infested with 20, 50, 150 or 300 beetles, all of which were removed after 2 weeks. Flight initiation of the progeny was observed over a period of 4 weeks, with and without the synthetic aggregation pheromone of P. truncatus. Addition of the synthetic pheromone had no influence on the number of beetles taking off. The number of beetles dispersing increased with growing initial and progeny densities. Dispersal rates (% of total progeny dispersing) rose with declining rate till they reached a maximum at ca. 33%. Of the beetles dispersing, 74% left the cultures between 18.00 and 20.00 hours. Surviving progeny per female decreased with increasing initial density. Sex ratios in the initial cultures and in the F1 were ca. 1:1, whereas a higher proportion of females (67%) was found among the dispersing beetles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003147811537
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Trees or stores? The origin of migrating shape Prostephanus truncatus collected in different ecological habitats in southern Benin (1998)
    Springer
    Entomologia experimentalis et applicata 87 (1998), S. 285-294 
    Details
    ISSN: 1570-7458
    Keywords: larger grain borer ; Prostephanus truncatus ; Bostrichidae ; West Africa ; gut-content analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Migrating Prostephanus truncatus (Horn) (Col.: Bostrichidae) were collected weekly with pheromone-baited funnel traps at three different sites in southern Benin for 12 months. One site was located in a primary forest, one in a peri-urban area, and one in a region with intensive agriculture. The sex of the trapped beetles was determined. The gut-content of the specimens was analyzed for remains of lignin and starch, the former indicating recent feeding on woody, the latter on a starchy substrate, such as stored maize or dried cassava. At all locations, the sex ratio of migrating P. truncatus was significantly female-biased, with the greatest proportion of females trapped at the peri-urban site. At the forest site, most beetles had lignin in their guts, while the proportion of beetles containing starch was highest in the peri-urban site. Approximately equal proportions of beetles with either starch and lignin were trapped in the region with intensive agriculture. The results are discussed with regard to the population dynamics of P. truncatus in different habitats and the flight activity of the beetles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003245721641
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of insecticides on life history parameters of the aphid parasitoidAphidius rhopalosiphi [Hym.: Aphidiidae] (1993)
    Springer
    BioControl 38 (1993), S. 245-255 
    Details
    ISSN: 1573-8248
    Keywords: insecticides ; side effects ; life history parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Les effets de quatre insecticides (deux organophosphates, un pyréthroïde et un carbamate) appliqués à différentes doses, furent testés sur certains paramètres biotiques du parasitoïde aphidiphage,Aphidius rhopalosiphi (De Stefani-Perez). Les méthodes choisies simulaient les conditions du champ dans le laboratoire. Après traitement des momies, seuls deux insecticides (parathion et le haut dosage de pirimicarb) ont pu provoquer une réduction significative de l'émergence des adultes. Par contre, leur fertilité et leur longévité ne furent pas affectées. Sur l'ensemble des insecticides, seuls les résidus de parathion provoquèrent la mort d'un nombre considérable de femelles deA. rhopalosiphi. Le comportement d'orientation des adultes fut affecté par le demethon-S-methyl et le fenvalerate. Une très forte mortalité fut causée par une application directe de demeton-S-methyl, de parathion et du haut dosage de pirimicarb sur les femelles deA. rhopalosiphi.
    Notes: Abstract The effects of four insecticides (two organophosphates, a pyrethroid and a carbamate), applied at different dosages, on different life history parameters of the aphid parasitoidAphidius rhopalosiphi (De Stefani-Perez) were tested. The methods used simulated field conditions in the laboratory. After application on the mummies, only two treatments (parathion and the high dosage of pirimicarb) caused a significant reduction of adult hatching. Fertility and longevity of the wasps were not affected by any of the tested insecticides. Dried residues of parathion, but not of the other insecticides, killed a considerable number ofA. rhopalosiphi females. The searching behaviour of the wasps was affected by demeton-S-methyl and fenvalerate. A direct application of demeton-S-methyl, parathion, and the high dosage of pirimicarb onA. rhopalosiphi females caused high mortality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372560
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    Paper (German National Licenses)
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