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  • 1
    Electronic Resource
    Electronic Resource
    Sweetpotato whitefly resistance to insecticides in Hawaii: Intra-island variation is related to insecticide use (1993)
    Springer
    Entomologia experimentalis et applicata 67 (1993), S. 173-182 
    Details
    ISSN: 1570-7458
    Keywords: Insecta ; Bemisia tabaci ; Homoptera ; Aleyrodidae ; spatial variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Susceptibility to acephate, methomyl, and permethrin was determined with laboratory bioassays of field-collected adults from 15 populations of the B biotype of sweetpotato whitefly,Bemisia tabaci (Gennadius) (Homoptera:Aleyrodidae), from Hawaii. Comparisons at the LC50 showed up to 24-fold resistance to acephate, 18-fold resistance to methomyl, and 4-fold resistance to permethrin. Analysis of variance showed significant intra-island variation in susceptibility to each insecticide, but no significant variation among islands. Insecticide use varied from 4 to 103 insecticide sprays per site per season. Acephate and methomyl were used more often than permethrin. The frequency of application and LC50 for each insecticide were positively correlated across sites. These results suggest that local variation in insecticide use was a primary cause of variation in susceptibility. If local insecticide use is a key determinant of resistance, as our results suggest, growers can retard resistance development locally by reducing their own insecticide use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02386523
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  • 2
    Electronic Resource
    Electronic Resource
    Behavioral and physiological responses of susceptible and resistant diamondback moth larvae to Bacillus thuringiensis (1991)
    Springer
    Entomologia experimentalis et applicata 61 (1991), S. 179-187 
    Details
    ISSN: 1570-7458
    Keywords: Mechanism of resistance ; diamondback moth ; Plutellidae ; Bacillus thuringiensis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To determine whether field-selected resistance of diamondback moth (Plutella xylostella L.) (Lepidoptera: Plutellidae) to Bacillus thuringiensis is based on behavioral or physiological adaptation, we measured mortality, consumption, and movement of larvae from a susceptible and a resistant colony when placed on untreated and B. thuringiensis treated cabbage. Colonies did not differ in mortality, consumption, or movement on untreated cabbage. However, for a given amount of consumption of treated cabbage, resistant larvae had lower mortality than susceptible larvae, demonstrating that resistance had a physiological basis. The movement patterns could not account for the differences between colonies in survival. Resistant larvae did not avoid B. thuringiensis more than did susceptible larvae. Thus, we found no evidence for behavioral resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00191748
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Experiments and nuclear measurements in search of cold fusion processes (1990)
    Springer
    Journal of fusion energy 9 (1990), S. 287-297 
    Details
    ISSN: 1572-9591
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper reports a collaborative effort of a team which formed at Los Alamos to investigate the announcement that “cold fusion” may be occurring in electrochemical cells using palladium cathodes and platinum anodes in a LiOD electrolyte. Four electrochemical cells were construced and operated for 3–5 weeks under various geometrical and electrical conditions. Nuclear diagnostic measurements included high and low resolution gamma-ray spectroscopy, integral neutron counting with well detectors and banks of3He tubes, and neutron spectroscopy withNE-213 scintillators. For one of the cells, the deuterium loading of the cathode was determined from resistance measurements to beD/Pd⩽ 0.8. No conclusive evidence was found for the production of neutrons or 2.223-MeV gammas above levels consistent with background. The results of the measurements of tritium levels in the cell electrolytes are also reported. Experiments to reproduce the observation of neutrons from high pressureTi-D 2 gas experiments were also performed with negative results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01059245
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructure of the endosymbionts of the whitefly,Bemisia tabaci andTrialeurodes vaporariorum (1993)
    Springer
    Protoplasma 176 (1993), S. 106-115 
    Details
    ISSN: 1615-6102
    Keywords: Whitefly ; Bacteria ; Symbiosis ; Micro-organism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ultrastructure of the mycetocytes and mycetome micro-organisms of the sweetpotato whitefly,Bemisia tabaci Genn. andTrialeurodes vaporariorum West are described. InB. tabaci, two morphologically distinct types of micro-organisms were observed in mycetocytes. The predominant type lacked a distinct cell wall, was pleomorphic in shape with a surrounding vacuole. The second type was a coccoid organism, with inner and outer cell membranes. The coccoid organism was often found in groups of varying number within vacuoles, and in many cases appeared to be undergoing degradation. InT. vaporariorum mycetocytes, pleomorphic and coccoid organisms were found, although the coccoid micro-organism inT. vaporariorum, had a thicker cell wall than the coccoid micro-organism inB. tabaci.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378946
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    Paper (German National Licenses)
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