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  • Coleoptera  (7)
  • Springer  (7)
  • American Geophysical Union (AGU)
  • National Academy of Sciences
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  • Springer  (7)
  • American Geophysical Union (AGU)
  • National Academy of Sciences
Years
  • 1
    Electronic Resource
    Electronic Resource
    Aggregation pheromone of palmetto weevil,Rhynchophorus cruentatus (F.) (Coleoptera: Curculionidae) (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 505-515 
    Details
    ISSN: 1573-1561
    Keywords: Coleoptera ; Curculionidae ; Rhynchophorus cruentatus ; palmetto weevil ; S. palmetto ; aggregation pheromone ; 5-methyl-4-octanol ; cruentol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract 5-Methyl-4-octanol is the major aggregation pheromone of the palmetto weevil,Rhynchophorus cruentatus (F.). The pheromone (cruentol) was identified by coupled gas chromatographic-electroantennographic (GC-EAD) analysis of male-produced volatiles, coupled GC-mass spectrometry (MS) in electron impact and chemical ionization mode, and coupled GC-high resolution MS. In laboratory and field assays, a diastereomeric mixture of synthetic cruentol greatly enhanced attraction of weevils to cabbage palmetto,Sabal palmetto (Walter), stem tissue, indicating that cruentol and host volatiles are synergistically attractive. An attractive lure in combination with efficient traps should facilitate development of semiochemical-based management forR. cruentatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059593
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  • 2
    Electronic Resource
    Electronic Resource
    Cholesterol oxidase: an oöstatic and larvicidal agent active against the cotton boll weevil,Anthonomus grandis (1995)
    Springer
    Entomologia experimentalis et applicata 74 (1995), S. 253-258 
    Details
    ISSN: 1570-7458
    Keywords: Coleoptera ; Curculionidae ; Anthonomus grandis ; cholesterol oxidase ; insecticidal protein ; oöstatic agent ; transgenic cotton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The enzyme cholesterol oxidase (E.C. 1.1.3.6), purified fromStreptomyces culture filtrate was previously found to have oral insecticidal activity on neonate larvae of the boll weevil (Anthonomus grandis grandis Boheman) from a laboratory population. In the present study, second instar larvae were also controlled by the enzyme at diet concentrations similar to those which control neonates (12 day LC50=2.4 μg.ml−1 in diet). Larvae from field-collected adults were similarly susceptible to cholesterol oxidase in the diet. When ingested by adult females during the mating/pre-oviposition period, cholesterol oxidase greatly reduced subsequent oviposition (83% reduction in eggs laid as compared to controls) and larval survival (97% reduction from controls). Dissection of treated adult females revealed poorly developed ovaries and few developing oöcytes. These studies were conducted to further evaluate the utility of cholesterol oxidase in a program to establish boll weevil-resistant transgenic cotton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02381789
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  • 3
    Electronic Resource
    Electronic Resource
    Impact of acidic deposition onEncelia farinosa gray (Compositae: Asteraceae) and feeding preferences ofTrirhabda geminata horn (Coleoptera: Chrysomelidae) (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 97-105 
    Details
    ISSN: 1573-1561
    Keywords: Encelia farinosa ; Asteraceae ; Trirhabda geminata ; Coleoptera ; Chrysomelidae ; feeding preferences ; acidic deposition ; plant stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Container grownEncelia farinosa were exposed to three 3-hr episodes of acidic fog (pH 2.5) typical of events in southern California. Adults and larvae of the specialist leaf-feeding herbivore,Trirhabda geminata, preferred to feed on the acidic-treated foliage compared to control fogged (pH 6.3–6.5) foliage. Previous feeding damage on the plants did not affect feeding preference. The acidic-fogged foliage was significantly higher in total nitrogen and soluble protein but not different from control-treated tissue in water content. Stress on native populations of this drought-deciduous shrub caused by atmospheric pollutants may also result in altered feeding ecology of the beetle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987475
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  • 4
    Electronic Resource
    Electronic Resource
    Attraction of male beetles to grubs: Evidence for evolution of a sex pheromone from larval odor (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 1117-1124 
    Details
    ISSN: 1573-1561
    Keywords: Cyclocephala lurida ; Coleoptera ; Scarabaeidae ; sex pheromone ; chemical communication ; evolution of signals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Females of the scarabaeid beetleCyclocephala lurida produce a volatile sex pheromone which attracts conspecific males. Field experiments demonstrated that larvae of both sexes also emit volatile chemicals that stimulate similar responses in adult males, including attempts by the attracted males to mate with the nonreproductive immature stage. Significantly more adult males were caught in traps baited with conspecific male or female larvae or adult females than in blank control traps. Hexane extracts of both male and female grubs were at least as effective as live larvae in trapping male adults, demonstrating that the behavioral responses are mediated by volatile chemicals. Sensory and behavioral responses of males to sex pheromones emitted by adult females are part of the functional communication system. However, their response to grubs is not functional, because grubs are normally temporally and spatially inaccessible to mate-seeking males. In theory, the evolution of a communication system is problematic because it requires the development of a signal in one sex and the sensory and behavioral attributes to respond to that signal in the other sex. The ontogeny of sex pheromone communication inC. lurida suggests a partial solution to this evolutionary problem. We propose that this sex pheromone communication system is probably derived from noncommunicative volatile chemicals that are lost in adult males and retained by adult females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980067
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  • 5
    Electronic Resource
    Electronic Resource
    Factors contributing to resistance of exotic maize populations to maize weevil,Sitophilus zeamais (1987)
    Springer
    Journal of chemical ecology 13 (1987), S. 751-762 
    Details
    ISSN: 1573-1561
    Keywords: Sitophilus zeamais ; Coleoptera ; Curculionidae ; maize weevil ; maize ; resistance ; antifeedant ; sugar content ; hardness ; phenolic content ; ferulic acid ; p-coumaric acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Factors contributing to resistance of maize to infestation by the corn weevilSitophilus zeamais were investigated in four populations of indigenous and improved maize from Belize. Resistance was related to the antifeedant properties of grain as well as sugar content and mechanical hardness. Grain extracts of all populations of maize significantly reduced insect feeding on treated artificial diets when compared to control diets. Consumption of treated diets was negatively correlated with phenolic content of the grain extract. An analysis by GC-MS indicated that ferulic acid andp-coumaric acid were the principal phenolics present in the extracts, and insect feeding was strongly deterred when pure substances were added to insect diets. Fluorescence associated with ferulic acid and related compounds in grain sections was located in the pericarp and aleurone layer and was especially intense in the most resistant grain variety.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020157
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  • 6
    Electronic Resource
    Electronic Resource
    Correlation of phenolic acid content of maize to resistance toSitophilus zeamais, the maize weevil, in CIMMYT'S collections (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 301-315 
    Details
    ISSN: 1573-1561
    Keywords: Phenolic acids ; resistance ; susceptibility ; maize ; maize weevil ; Sitophilus zeamais ; Coleoptera ; Curculionidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The (E)-ferulic acid content of the grain of nine populations of land races of maize derived from CIMMYT's collections was found to be negatively correlated to susceptibility characteristics towards the maize weevilSitophilus zeamais. Correlation coefficients for six susceptibility parameters and (E)-ferulic acid content were significant and ranged from −0.58 to −0.79. A multiple regression analysis by the SAS forward procedure using the primary seed characteristics associated with susceptibility indicated that the ferulic acid content was the only significant factor in explaining variation in at least two susceptibility parameters: the Dobie index and adult preference. In 15 CIMMYT pools, correlations between four susceptibility parameters and (E)-ferulic acid content were also significant (−0.76 to −0.81). The results suggest that phenolic acid content is a leading indicator of grain resistance or susceptibility to insects and may represent a newly identified mechanism of resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021766
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  • 7
    Electronic Resource
    Electronic Resource
    Life cycle and host specificity of the heliotrope weevil,Pachycerus cordiger (=Madidus auct.) [Col.: Curculionidae] (1990)
    Springer
    BioControl 35 (1990), S. 475-484 
    Details
    ISSN: 1573-8248
    Keywords: Life cycle ; Host specificity ; Pachycerus cordiger ; Coleoptera ; Curculionidae ; Heliotropeum europeaeum ; Boraginaceae ; Biological control ; Cycle biologique ; spécificité ; Pachycerus cordiger ; Coleoptera: Curculionidae ; Heliotropeum europaeum ; Boraginaceae ; lutte biologique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Le charançonPachycerus cordiger Germar [Curculionidae: Cleonini] est prometteur pour lutter contre la mauvaise herbeHeliotropium europaeum L. (Boraginaceae) en Australia. L'adulte se nourrit des feuilles et la larve construit une cellule de terre autour d'une racine principale dont elle se nourrit. Il n'y a qu'une seule génération par an. Les nouveaux adultes passent l'hiver toujours dans leurs cellules avant de sortir au printemps, saison à partir de laquelle ils commencent à se nourrir, à s'accoupler et à pondre sur leurs plantes hôtes de Mai jusqu'à la fin de Juillet. Des adultes et des larves du 1er stade ont été testés sur 7 espèces de Boraginacées et 31 des plus importantes espèces cultivées.P. cordiger s'est montré spécifique des Boraginacées. Selon les observations sur le terrain, ce charançon est probablement limité aux espèces annuelles d'Heliotropium de l'été. Un parasite des œufs,Caenocrepis ?bothynoderi Gromakov [Hymenoptera: Pteromalidae] est très répandu et peut occasionner jusqu'à 18% de mortalité.
    Notes: Abstract Pachycerus cordiger Germar (Curculionidae: Cleonini) is a potential agent for the biological control ofHeliotropium europaeum L. (Boraginaceae) in Australia. Adults feed on the leaves and larvae feed on the main roots of the weed within an earthen cell. These is one generation per year. Adults overwinter in the cells before emerging in late spring when they begin to feed, mate and oviposit on their host plants from late May until late July. Seven Boraginaceae and 31 economically important crop species were tested using adults and 1st instar larvae.P. cordiger was found to be specific to the Boraginaceae. Field observations strongly suggested that the weevil is restricted to summer-annualHeliotropium species. A widespread egg parasite,Caenocrepis? bothynoderi Gromakov [Hymenoptera: Pteromalidae], caused up to 18% mortality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375273
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