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  • 1
    Electronic Resource
    Electronic Resource
    Sensory interaction during trap-finding by female onion flies: implications for ovipositional host-plant finding (1991)
    Springer
    Entomologia experimentalis et applicata 58 (1991), S. 239-249 
    Details
    ISSN: 1570-7458
    Keywords: Delia antiqua ; Anthomyiidae ; onion fly ; onion maggot ; olfactory stimuli ; visual stimuli ; host-finding ; sensory interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Using various three-dimensional traps alone and in combination with the onion volatile, dipropyl-disulphide (Pr2S2), we found that visual behaviour of female onion flies, Delia antiqua (Meigen), varied with the ‘visual context’ (background composition and trap spacing) in which traps were presented and the females' reproductive state (mated vs. unmated). Against a background of real onions, females alighted more frequently on spherical than cylindrical traps, and white than green spheres, but females responded equally to white and green cylinders. In an onion field, baiting traps with Pr2S2 significantly increased female response to white over green traps, but had no influence on their response to trap shape. When traps were spaced 10 m apart and against a background of bare soil, females orienting to Pr2S2 baits alighted more frequently on vertical than horizontal traps, but shape and spectral reflectance were insignificant. However, when traps were spaced 0.25 m apart, females orienting to Pr2S2 baits alighted more frequently on cylinders than spheres. Mated females alighted more frequently on green than white cylinders, but unmated females responded to cylinders independent of spectral reflectance. When located 20 m downwind from Pr2S2 baits, mated females alighted on green cylinders significantly more often than unmated females. Response to traps mimicking onion plants suggests that ovipositional host-finding in female onion flies is dominated by olfactory responses at long range (several metres) and by visual cues at short-range (ca. 1 m). The view that host location by female onion flies is a hierarchical response pattern mediated by multiple sensory modalities and modified by resource level (habitat) and reproductive status, is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366138
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  • 2
    Electronic Resource
    Electronic Resource
    Sex pheromone components of the fruit-tree leaf roller,Archips argyrospilus (Walker) (Lepidoptera: Tortricidae), in British Columbia (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 2855-2864 
    Details
    ISSN: 1573-1561
    Keywords: Archips argyrospilus ; fruit-tree leaf roller ; Lepidoptera ; Tortricidae ; sex pheromone ; (11Z)-tetradecen-1-ol acetate ; (11E)-tetradecen-1-ol acetate ; (9Z)-tetradecen-1-ol acetate ; dodecan-1-ol acetate ; (11Z)-tetradecen-1-ol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In field experiments in the Okanagan Valley, British Columbia, the pheromone blend of (11Z)-tetradecen-1-ol acetate (Z11-14:OAc), (11E)-tetradecen-1-ol acetate (E 11-14:OAc), (9Z)-tetradecen-1-ol acetate (Z9-14:OAc) and dodecan-1-ol acetate (12: OAc) at a 100∶64∶2∶1 ratio (western FTLR blend) attracted significantly more male fruit-tree leaf roller (FTLR),Archips argyrospilus (Walker), than did the previously reported four-component blend and modifications thereof. Addition of (11Z)-tetradecen-1-ol (Z11-14:OH) to the western FTLR blend in a ratio of 4% relative toZ11-14: OAc further significantly enhanced attraction. Compounds were identified and their ratio determined by coupled gas chromatographic-electroantennographic (GC-EAD) and coupled GC-mass spectrometric analyses of female FTLR pheromone gland extracts and by retention index calculations of candidate pheromone components. Determination and use of geographically specific pheromonal blends may be required for optimal, semiochemical-based biorational control of FTLR and other lepidopteran orchard pests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980587
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  • 3
    Electronic Resource
    Electronic Resource
    Aggregated oviposition inDelia antiqua (Meigen): A case for mediation by semiochemicals (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 621-635 
    Details
    ISSN: 1573-1561
    Keywords: Delia antiqua ; onion maggot ; onion fly ; Diptera ; Anthomyiidae ; group oviposition ; aggregation pheromone ; ovipositional host-finding ; olfaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Experiments conducted in the laboratory tested the hypotheses that aggregated oviposition by onion maggot flies,Delia antiqua (Meigen), is caused by stimuli associated with ovipositing females, newly laid eggs, or both. Using a paired oviposition station bioassay that eliminated visual stimuli associated with the treatment under study, 67% of the eggs laid by caged females were in response to the odor of females already ovipositing on an onion slice, as opposed to 33% of the eggs laid in response to an onion slice alone. When newly laid eggs were transferred to onion slices and held for either 24 or 48 hr before being bioassayed against similarly aged untreated onions, 74% and 97% of the eggs were laid at the egg-treated onion stations, respectively. Similar results were achieved when an aqueous wash of newly laid eggs was applied to the onion slice. When the egg wash was processed through a bacterial filter or when eggs were present but not in contact with onions, all response was eliminated. These results implicate microorganisms transmitted on the egg surface in creating an attraction for ovipositing females. Heptane extracts of ovipositor tips from mated, ovipositing females induced 72% of the test females to oviposit near points at which extracts were applied to the oviposition station floor. A behavioral sequence for an optimal host-selection strategy is hypothesized, whereby host-seeking female onion flies respond to host-derived alkyl sulfides at long range and metabolic by-products of microbially infested hosts and visual cues at short range (ca. l m), with final selection of oviposition sites potentially reinforced by contact with an aggregation pheromone released or left on the substrate by ovipositing females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987824
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  • 4
    Electronic Resource
    Electronic Resource
    (E4,E10)-dodecadienyl acetate: Novel sex pheromone component of tentiform leafminer,Phyllonorycter mespilella (Hübner) (Lepidoptera: Gracillariidae) (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 1789-1798 
    Details
    ISSN: 1573-1561
    Keywords: Lepidoptera ; Gracillariidae ; Phyllonorycter blancardella ; P.mespilella ; sex pheromone ; sex attractant ; (E10)-dodecenyl acetate ; (E4,E10)-dodecadienyl acetate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract (E4,E10)-dodecadienyl acetate (E4,E10-12∶OAc) is a newly discovered sex pheromone component of the tentiform leafminer,Phyllonorycter mespilella (Hübner). In apple orchards, traps baited with 1Μg ofE4,E1012∶OAc attractedP. mespilella in British Columbia andP. blancardella (F.) in Massachusetts and Nova Scotia. The compound was identified inP. mespilella by gas chromatographic-electroantennographic analysis (GC-EAD) of pheromone gland extracts, retention index calculations, EAD profiles toE3 toE10 dodecenyl acetates, and synthesis of candidate pheromone components. Even thoughE4,E10-12∶OAc was not detected in gland extracts by GC-mass spectroscopy, several factors indicate that it is female-produced. Antennal responses to gland extracts coincided with authenticE4,E10-12∶OAc on four GC columns with different retention characteristics.E4,E10-12∶OAc andE10-12∶OAc, a known female-produced pheromone component, elicited equally strong EAD responses. In field tests,E4,E10-12∶OAc was two to four times more attractive thanE10-12∶OAc. There was no additive or synergistic effect between the two components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00982308
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of different habitats and mating on olfactory behavior of onion flies seeking ovipositional hosts (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 605-620 
    Details
    ISSN: 1573-1561
    Keywords: Delia antique ; Diptera ; Anthomyiidae ; onion fly ; onion maggot ; host finding ; olfactory behavior ; resource distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Using traps baited with natural and synthetic onion volatiles, we examined the effects of different habitats and mating on the olfactory behavior of laboratory-reared and wild onion flies. Rankings of olfactory treatments as host-finding stimuli for females were dependent on their mating status and the habitat in which they were foraging. In habitats devoid of hosts, traps baited with individual alkyl sulfides were as effective as 4-day-old chopped onions and more effective than 1-day-old onions in eliciting host-finding behavior in laboratory-reared unmated females (LUF) and laboratory-reared mated females (LMF). However, upwind dispersal and percent recapture were always significantly greater in LUF. In one experiment, Pr2S2 was 19 times more attractive to LMF in a fallow field, as than it was in an onion field. Reduced effectiveness of alkyl sulfides as host-finding stimuli in onion fields probably results in part because they are less findable, but more importantly because of a change in searching behavior after females have mated. Evidence to support the latter contention is that traps baited with alkyl sulfides and onions were equally findable by unmated females in both habitats. The behavior of LMF was identical to that of wild females, whereas the behavior of LUF was identical to wild males. The hypothesis that olfactory host-finding behavior in onion flies is modified by the resource level was upheld. Alkyl sulfides appear to be the primary, and possibly the only, chemical effectors of host-finding at the patch level of resource distribution, whereas the complex blend emitted by aged, chopped, or damaged onions appears to be acting at the final level of host-finding, while egg-laying females are moving between adjacent hosts in search of an optimal oviposition site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987823
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  • 6
    Electronic Resource
    Electronic Resource
    Response of male eye-spotted bud moth,Spilonota ocellana (Lepidoptera: Tortricidae), to different pheromone blends in north America and The Netherlands (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 625-630 
    Details
    ISSN: 1573-1561
    Keywords: Lepidoptera ; Tortricidae ; Spilonota ocellana ; eye-spotted bud moth ; sex pheromone ; (Z)-8-tetradecenyl acetate and (Z)-8-tetradecenyl alcohol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Response of male eye-spotted bud moth,Spilonota ocellana (Denis and Schiffermüller), to different ratios of synthetic sex pheromone components, (Z)-8-tetradecenyl acetate (Z8-14:OAc) and (Z)-8-tetradecenyl alcohol (Z8-14:OH), were compared in four North American locations and in one location in The Netherlands. In British Columbia, Nova Scotia, Michigan, and The Netherlands, a 99:1 blend ofZ8-14:OAc andZ8-14:OH captured significantly more maleS. ocellana thanZ8-14:OAc alone or binary blends containing 10–50%Z8-14:OH. In Ontario, where population sizes were low compared to the other four locations, trends in trap catches were similar, and there was no indication that maleS. ocellana responded differently to the tested pheromone blends. A 99:1 blend ofZ8-14:OAc andZ8-14:OH should be most effective in pheromone-based control programs ofS. ocellana in North America and in The Netherlands. Our results confirm earlier studies that a 99:1 blend ofZ8-14:OAc andZ8-14:OH captures significantly more maleS. ocellana thanZ8-14:OAc alone. However, our finding that a 99:1 blend ofZ8-14:OAc andZ8-14:OH is significantly more attractive than binary blends containing 10–50%Z8-14:OH differs from previous findings in Germany and Switzerland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059602
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