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  • 1
    Electronic Resource
    Electronic Resource
    The effect of a heat-stable enterotoxin isolated from Escherichia coli on pheromone production in fat bodies isolated from male boll weevils (1991)
    Springer
    Entomologia experimentalis et applicata 60 (1991), S. 305-308 
    Details
    ISSN: 1570-7458
    Keywords: Bacterial products ; contamination ; insect rearing ; gas chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354224
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Inapparent infection ofDiatraea grandiosella byHeliothis virescens cytoplasmic polyhedrosis virus (1992)
    Springer
    BioControl 37 (1992), S. 347-351 
    Details
    ISSN: 1573-8248
    Keywords: Heliothis virescens ; cytoplasmic polyhedrosis virus ; inapparent infection ; Diatreae grandiosella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Cette étude montre la présence de virions de la polyédrose cytoplasmique (CPV) d'Heliothis virescens dans l'hémolymphe dediatraea grandiosella qui est de ce fait considéré comme un porteur sain du virus. Chez des hôtes considérés comme normaux, tels queH. virescens etSpodoptera exigua, la virose à CPV d'Heliothis virescens se traduit par la présence de nombreux polyèdres intestinaux, tandis que chezD. grandiosella ces polyèdres sont absents des larves virosées. L'hémolymphe des larves deD. grandiosella contaminées est infectieurx par voie orale pour les chenilles d'H. virescens, et deS. exigua chez lesquelles elle induit une virose classique.
    Notes: Abstract The terminal stage of infection with cytoplasmic polyhedrosis viruses (CPVs) is formation of crystal-like inclusion bodies (polyhedra) in host insects. The degree of susceptibility of larvae to CPV, based on light microscopy and presence of polyhedra, varies with the host species.Heliothis virescens (F.) andSpodoptera exigua (Hübner) are highly susceptible to CPV. In CPV treatedDiatraea grandiosella (Dyar), polyhedra were absent in all 400 + insects examined with light and electron microscopy. However,H. virescens larvae became infected when fed haemolymph ofD. grandiosella larvae or pupae (36±10 days post treatment) developed from CPV-treated larvae. No difference in pathology was observed betweenH. virescens larvae infected with CPV polyhedra and haemolymph fromD. grandiosella. This study provides evidence thatD. grandiosella can serve as a symptomless (no occlusion bodies) carrier of a CPV which is fully expressed inH. virescens species. The observation is interesting because it reveals a potentially important aspect of the epizootiology of this insect virus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02373108
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effects of bacterial contamination on development ofMicroplitis croceipes [Hym.: Braconidae] (1992)
    Springer
    BioControl 37 (1992), S. 475-481 
    Details
    ISSN: 1573-8248
    Keywords: Microplitis ; Heliothis ; bacterial contamination ; Microplitis croceipes ; Heliothis virescens ; bacterial contamination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé L'étude a démontré que la contamination bactérienne d'Heliothis virescens a généralement une influence négative sur le développement deMicroplitis croceipes. La plus virulent des 4 espèces bactériennes étudiées a étéPseudomonas maltophilia suivie parBacillus subtilis. Ces deux bactéries provoquent une forte mortalité à tous les stades de développment deMicroplitis. Les larves deMicroplitis étaient moins sensibles àEscherichia coli et àLeuconostoc mesenteroides qu'àB. subtilis etP. maltophilia. Bien qu'E. coli n'ait eu aucun effet sur le nombre de cocons produits, l'émergence a été plus faible dans le lot contaminé que dans le lot témoin. La longévité des adultes deMicroplitis est fortement réduite par la contamination bactérienne provenant de sources alimentaires.
    Notes: Abstract Bacterial contaminants ofHeliothis virescens (F.) influenced the development ofMicroplitis croceipes (Cresson). Among the four bacterial species studied, the most virulent wasPseudomonas maltophilia Hugh and Ryschenkow followed byBacillus subtilis (Ehrenberg) Cohn. Both bacteria caused severe mortality in all stages ofMicroplitis tested.Microplitis larvae were less susceptible toEscherichia coli (Migula) Castellani and Chalmers andLeuconostoc mesenteroides (Tsenkovskii) van Thieghem than toB. subtilis andP. maltophilia. AlthoughE. coli did not affect the number of cocoons produced, adult emergence was lower than in controls. Longevity of adultMicroplitis exposed to bacterially contaminated honey-water was greatly reduced in all bacterial treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02373120
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    Paper (German National Licenses)
    Fulltext
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