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  • Spodoptera littoralis  (8)
  • Lepidoptera  (3)
  • 1995-1999  (3)
  • 1990-1994  (6)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Azadirachtin:-advances in understanding its activity as an antifeedant (1996)
    Springer
    Entomologia experimentalis et applicata 80 (1996), S. 23-26 
    Details
    ISSN: 1570-7458
    Keywords: allelochemicals ; secondary plant metabolites ; feeding ; Spodoptera littoralis ; Schistocerca gregaria ; Locusta migratoria ; electrophysiology ; contact chemoreceptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194716
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  • 2
    Electronic Resource
    Electronic Resource
    Behavioural and neurophysiological responses ofSpodoptera littoralis to azadirachtin and a range of synthetic analogues (1995)
    Springer
    Entomologia experimentalis et applicata 77 (1995), S. 69-80 
    Details
    ISSN: 1570-7458
    Keywords: azadirachtin ; azadirachtin analogues ; Spodoptera littoralis ; antifeedant ; behaviour ; electrophysiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The antifeedant activity of azadirachtin and 56 azadirachtin analogues, including 22,23-dihydroazalirachtin, against larvae ofSpodoptera littoralis was investigated using behavioural and electrophysiological bioassays. None of the analogues was as active as azadirachtin, although many showed significant antifeedant activity at high concentrations. The majority of the analogues stimulated a dose-dependent response from a neurone in the medial styloconic maxillary sensilla which correlated with the behavioural activity. Methylation of the hydroxy substitutions on the azadirachtin molecule usually resulted in a decrease in antifeedant activity, as did the addition of bulky groups to the dihydrofuran ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02383020
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  • 3
    Electronic Resource
    Electronic Resource
    Daily changes in the responsiveness of taste receptors correlate with feeding behaviour in larvae of Spodoptera littoralis (1991)
    Springer
    Entomologia experimentalis et applicata 61 (1991), S. 73-81 
    Details
    ISSN: 1570-7458
    Keywords: Electrophysiology ; feeding behaviour ; sucrose ; Spodoptera littoralis ; neural variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Larvae of Spodoptera littoralis were monitored through the final larval stadium (6 days) for weight gain, amount eaten in bioassays and responsiveness of gustatory receptors to stimulation with sodium chloride and four concentrations of sucrose. The age of larvae within the stadium, time of day (am or pm) and interactions between these factors influenced the electrophysiological response to 0.05 M sucrose. Overall, the responsiveness of taste receptors increased in the first half of the stadium, then declined. Neural input correlated with weight gain on days 1 to 4, and with amount eaten in bioassays on days 1 to 5. This correlation between neural input and feeding behaviour indicates that the observed modulation in neural sensitivity has a causal relationship with feeding behaviour. The ways in which the modulation might occur are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367170
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  • 4
    Electronic Resource
    Electronic Resource
    Antifeedant effects of azadirachtin and structurally related compounds on lepidopterous larvae (1990)
    Springer
    Entomologia experimentalis et applicata 55 (1990), S. 149-160 
    Details
    ISSN: 1570-7458
    Keywords: Spodoptera littoralis ; Spodoptera frugiperda ; Heliothis virescens ; Heliothis armigera ; azadirachtin ; salannin ; limonoids ; antifeedants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'activité phagodissuadante de l'azadirachtine, de ses dérivés et des limonoïdes voisins sur 4 espèces de lépidoptères: Spodoptera littoralis, S. frugiperda, Heliothis virescens et H. armigera a été évaluée par des expériences avec et sans choix. Les expériences de choix ont montré que le comportement alimentaire de S. littoralis était modifié par plus de substances que celui de S. frugiperda ou H. virescens. Celui de H. armigera était le moins modifié. Les 2 substances les plus puissantes parmi les 40 examinées, ont été l'azadirachtine et le dihydroazadirachtine. Ces résultats montrent que l'hydrogénation de la double liaison C-22,23 ne réduit pas l'activité phagodissuadante et que la nature des substitutions en C-1, C-3 et C-11 sont importantes. Les molécules avec des substitutions volumineuses en C-22 ou C-23 sont généralement des phagodissuadants aussi inefficaces que ceux ayant perdu un époxide. Les substances notées comme phagodissuadants actifs dans les expériences de choix ne sont pas toujours aussi actives en absence de choix. La valeur des tests dans l'évaluation du mode d'action des substances est discuté.
    Notes: Abstract The antifeedant activity of azadirachtin, azadirachtin-derivatives and related limonoids was assessed in choice and no-choice bioassays against four species of Lepidoptera: Spodoptera littoralis, Spodoptera frugiperda, Heliothis virescens and Heliothis armigera. The choice bioassay showed that the feeding behaviour of S. littoralis was affected by more of the compounds than that of either S. frugiperda or H. virescens. H. armigera was the least affected. Azadirachtin and dihydroazadirachtin were the most potent of the 40 compounds tested. The results showed that hydrogenation of the C-22,23 double bond did not decrease antifeedant activity and the nature of the substitutes at C-1, C-3 and C-11 were important. Molecules with bulky substitutes at either C-22 or C-23 were usually ineffective antifeedants as were compounds lacking an epoxide. Compounds recorded as active antifeedants in the choice bioassay were not always as active in the no-choice test. The value of the bioassays in assessing the mode of action of the compounds is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352576
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  • 5
    Electronic Resource
    Electronic Resource
    Azadirachtin: structural requirements for reducing growth and increasing mortality in lepidopterous larvae (1990)
    Springer
    Entomologia experimentalis et applicata 55 (1990), S. 169-181 
    Details
    ISSN: 1570-7458
    Keywords: Azadirachtin ; Spodoptera littoralis ; Spodoptera frugiperda ; Heliothis virescens ; growth disruption ; oral cannulation ; abdominal injection ; topical application
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Spodoptera littoralis, S. frugiperda et Heliothis virescens ont été exposés à l'azadirachtine et 23 autres substances voisines dans 3 expériences: canulation orale, injection d'haemolymphe et application topique. S. littoralis est sensible à un plus grand nombre de substances que les 2 autres espèces. De toutes façons, les substances les plus actives ont été l'azadirachtine, la 22,23-dihydroazadirachtine et la 1-détigloyl-22,23-dihydroazadirachtine. La nature des substitutions en C-1 et C-3 de l'anneau décaline modifie la puissance des substances, tout comme les substitutions en C-22,23. D'une façon générale, les chenilles ont été moins sensibles aux applications topiques qu'aux canulations dans le tube digestif ou aux injections dans l'haemolymphe.
    Notes: Abstract Spodoptera littoralis, Spodoptera frugiperda and Heliothis virescens were exposed to azadirachtin and 23 other related compounds in three bioassays: oral cannulation, haemolymph injection and topical application. Spodoptera littoralis was susceptible to a larger proportion of the compounds than either of the other species. Overall, azadirachtin, 22,23-dihydroazadirachtin and 1-detigloyl-22,23-dihydroazadirachtin were the most active compounds. The nature of the substitutes at C-1 and C-3 of the decalin ring affects the potency of the compounds, as does the addition of substitutes to C-22,23. Generally, larvae were less sensitive to compounds when they were topically applied than when they were cannulated into the gut or injected into the haemolymph.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352578
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  • 6
    Electronic Resource
    Electronic Resource
    Insect antifeedant activity associated with compounds isolated from species ofLonchocarpus andTephrosia (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 365-380 
    Details
    ISSN: 1573-1561
    Keywords: Spodoptera littoralis ; Spodoptera exempta ; Lepidoptera ; Noctuidae ; Lonchocarpus, Tephrosia ; antifeedant ; feeding behavior ; gustatory codes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The antifeedant activity of a series of 21 chalcones, flavanes, and flavanones isolated from the generaLonchocarpus andTephrosia (Leguminosae) was assessed by behavioral and electrophysiological bioassays against larvae ofSpodoptera littoralis andS. exempta. The antifeedant activity is related to the molecular structure of the compounds, and possible modes of interaction with the insect taste receptors are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021771
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  • 7
    Electronic Resource
    Electronic Resource
    Developmental inhibition ofSpodoptera litura (Fab.) larvae by a novel caffeoylquinic acid from the wild groundnut,Arachis paraguariensis (Chod et Hassl.) (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 2917-2933 
    Details
    ISSN: 1573-1561
    Keywords: Spodoptera litura ; Lepidoptera ; Noctuidae ; Arachis paraguariensis ; wild groundnuts ; caffeoylquinic acids ; resistance ; rutin ; quercetin ; phenolics ; growth inhibition ; Arachis hypogaea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A novel compound, 1-caffeoyl-4-deoxyquinic acid (1-CdQA) has been identified along with 3-caffeoylquinic acid (3-CQA) and 5-caffeoylquinic acid (5-CQA) (syn. chlorogenic acid) in the foliage ofArachis paraguariensis, a wild species of groundnut that is highly resistant to attack by the larvae ofSpodoptera litura. When neonate larvae were fed on diets treated with 3-CQA or 1-CdQA, their development was severely inhibited compared to larvae on untreated diets, and the effects were similar in nature and magnitude to those observed for larvae feeding on diets treated with 5-CQA, rutin, and quercetin. The effects of all the compounds were dose related, and their optimal concentration was approximately 3 mM, which corresponds to the total foliar concentration of both caffeoylquinic acids and quercetin diglycosides inA. paraguariensis. After 24 h, the development of third stadium larvae feeding on diets treated with 5-CQA, rutin and 1-CdQA was promoted compared to larvae on control diets, but after 96 hr larvae feeding on treated diets had gained significantly less weight than those on the control diets. 1-CdQA, 3-CQA, and quercetin dyglycosides (previously identified in the foliage ofA. paraguariensis) are considered to be valuable components in resistance of groundnuts toS. litura and may provide useful genetic markers in future breeding for resistance to this pest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980592
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  • 8
    Electronic Resource
    Electronic Resource
    Photooxidation of Nimbin and Salannin, Tetranortriterpenoids from the Neem Tree (Azadirachta indica) (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 2841-2860 
    Details
    ISSN: 1573-1561
    Keywords: Azadirachtin ; nimbin ; salannin ; antifeedant ; growth inhibition ; Azadirachta indica ; Spodoptera littoralis ; Locusta migratoria ; Schistocerca gregaria ; photooxidation ; photoisomerization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Nimbin and salannin, major triterpenoids accompanying azadirachtin in extracts of neem (Azadirachta indica) seeds, were photooxidized by UV light in the presence of oxygen to more polar, unstable intermediates that rearranged on silica gel to two final products in which the furan ring had been oxidized to isomeric hydroxybutenolides. The isomeric hydroxybutenolides were also readily formed when a crude extract of triterpenoids from neem seeds was irradiated, and both isomers of salannin have been isolated from seeds. Photooxidation of nimbin and salannin proceeded much faster than that of azadirachtin. All photoproducts showed some biological activity againstSpodoptera littoralis, Locusta migratoria, andSchistocerca gregaria. Isonimbinolide was as potent as azadirachtin at inhibiting feeding in all three species, and it also inhibited the growth ofS. littoralis. Isosalanninolide showed potent antifeedant and growth inhibitory activity againstS. littoralis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022523329255
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  • 9
    Electronic Resource
    Electronic Resource
    Behavioral and electrophysiological study of antifeedant mechanisms associated with polyhydroxy alkaloids (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 3167-3196 
    Details
    ISSN: 1573-1561
    Keywords: Spodoptera littoralis ; Spodoptera exempta ; Heliothis virescens ; Helicoverpa armigera ; Lepidoptera ; Noctuidae ; polyhydroxy alkaloids ; piperidine ; pyrrolidine ; castanospermine ; swainsonine ; alexine ; fagomine ; behavior ; electrophysiology ; receptor mechanisms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Eleven polyhydroxy alkaloids of plant origin were tested for anti-feedant effects against larvae of the lepidopteransSpodoptera littoralis, Spodoptera frugiperda, Heliothis virescens, andHelicoverpa armigera. Data from behavioral and electrophysiological investigations were correlated to reveal information on the mode of action of the antifeedants. The pyrrolidine DMDP was an effective antifeedant for all four species, whereas the piperidines fagomine and XZ-1 and the pyrrolizidine alexine were all ineffective as antifeedants. The activity of the pyrrolidines CYB-3 and DAB-1, the piperidines DNJ, DMJ, and BR1, and the bicyclic octahydroindolizine castanospermine varied among species. The investigation focuses on the structural similarities between some of the alkaloids and some common phagostimulatory sugars and illustrates a neural interaction involving the neurons that are differentially responsive to alkaloids and sugars. InS. littoralis, the neurons responding specifically to the alkaloids DMDP, DAB-1, and castanospermine and to the sugars fructose, sucrose, and glucose are more active when the compounds are applied singly than when an alkaloid and a sugar are applied together. The implications for the occurrence and functioning of different sugar receptor sites are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00979618
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