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  • 1
    Electronic Resource
    Electronic Resource
    ReleasingAmblyseius spp. [Acarina: Phytoseiidae] to controlThrips tabaci [Thysanoptera: Thripidae] on cabbage (1991)
    Springer
    BioControl 36 (1991), S. 561-573 
    Details
    ISSN: 1573-8248
    Keywords: Amblyseius barkeri ; Amblyseius cucumeris ; Thrips tabaci ; cabbage ; biological control ; Amblyseius barkeri ; Amblyseius cucumeris ; Thrips tabaci ; chou ; lutte biologique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Deux espèces d'acariens prédateurs,Amblyseius barkeri (Hugues [=A. mckenziei Schuster & Pritchard] etAmblyseius cucumeris (Oudemans), ont été testés comme agents de lutte biologique potentiels contreThrips tabaci Lindeman sur chou.A. barkeri colonisa les pommes des choux durant les essais préliminaires. Des lâchers en plein champ de différents nombres d'A. barkeri en 1987 ont démontré que les thrips sur choux étaient réduits proportionnellement au nombre d'acariens lâchés, mais le dommage dû aux thrips demeurait identique. En 1988, des lâchers en plein champ d'un même nombre d'A. cucumeris, mais à des périodes différentes, ont démontré que les premiers lâchers réduisaient au maximum le nombre de thrips et les dommages à la récolte, mais cette corrélation n'était pas établie quand les pyréthroides sont employés. Nous concluons qu'un lâcher inoculatif d'Amblyseius spp. est une stratégie potentielle utilisable contre les thrips du chou, en perfectionnant le choix du nombre et du moment des lâchers, pour rendre la lutte acceptable sur le plan commercial.
    Notes: Abstract Two species of predaceous mites,Amblyseius barkeri (Hughes) [=A. mckenziei Schuster & Pritchard] andA. cucumeris (Oudemans) [Acarina: Phytoseiidae] were evaluated as potential biological control agents forThrips tabaci Lindeman [Thysanoptera: Thripidae] on cabbage.A. barkeri colonized cabbage heads in preliminary trials. Field releases of different numbers of mites per plant during 1987 showed thatA. barkeri reduced the number of thrips in cabbage heads at harvest, and the reduction was proportional to the number of mites released, but thrips damage was unaffected. ReleasingA. cucumeris at different times during 1988, but releasing the same number of mites each time, we found that earlier releases resulted in fewer thrips and less damage at harvest; these relationships were not present, however, in plots treated with pyrethroid insecticides. We conclude that inoculative release ofAmblyseius spp. is a potentially useful thrips management strategy, but improvements in release timing and strategy will be required to provide commercially acceptable control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374439
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  • 2
    Electronic Resource
    Electronic Resource
    Transgenic Arthropods for Pest Management Programs: Risks and Realities (2000)
    Springer
    Experimental and applied acarology 24 (2000), S. 463-495 
    Details
    ISSN: 1572-9702
    Keywords: risk analysis ; transgenic arthropods ; pest management programs ; biological control ; genetic improvement ; genetic control ; horizontal gene transfer ; pesticide resistance ; containment facilities and procedures ; Wolbachia ; predatory mites ; Metaseiulus occidentalis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ability to genetically engineer arthropods using recombinant DNA meopens new opportunities for improving pest management programs but also creates new responsibilities, including evaluation of the potential risks of releasing transgenic arthropods into the environment. It is now becoming easier to transform diverse species of arthropods by a variety of recombinant DNA methods. Useful genes and genetic regulatory elements are being identified for pest arthropods, but less effort is being expended to identify genes that could improve the efficacy of beneficial arthropods. A transgenic strain of the natural enemy Metaseiulus (= Typhlodromus or Galendromus) occidentalis (Acari: Phytoseiidae) was developed using a method termed maternal microinjection. This transgenic strain was released into an experimental site on the campus of the University of Florida in 1996 after extensive reviews by the University of Florida Biosafety Committee, Florida Department of Agriculture and Consumer Services, United States Department of Agriculture Animal and Plant Health Inspection Service, and the United States Fish and Wildlife Service. The short term releases established a precedent for releasing a transgenic arthropod but, at present, no guidelines are available that would allow transgenic arthropods to be released permanently into the environment. Several scientific, environmental, and policy issues must be resolved before transgenic pests or beneficial arthropods can be deployed in practical pest management programs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006401225083
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of aerial dispersal on persistence and spread of pesticide-resistant Metaseiulus occidentalis in California almond orchards (1985)
    Springer
    Entomologia experimentalis et applicata 37 (1985), S. 17-31 
    Details
    ISSN: 1570-7458
    Keywords: aerial dispersal ; Metaseiulus occidentalis ; Acarina ; Phytoseiidae ; Tetranychidae ; spider mites ; pesticide resistance ; almonds ; biological control ; genetic improvement ; carbaryl ; western predatory mite ; European red mite ; two-spotted spider mite ; Pacific mite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La dispersion aérienne du phytoseïdae, M. occidentalis (Nesbitt), a été estimée comme élément de la lutte contre les populations résistantes aux insecticides établies dans les vergers de Californie. La dispersion maximale s'est produite fin juillet et début a oût en 1982 et 1983. La plupart des prédateurs (et des acariens) quittent les vergers avec les vents dominants du nordouest. Dans le verger, les vents dominants sont moins importants et la dispersion est généralement au hasard. Tant les acariens que les prédateurs se dispersaient au hasard par rapport à la taille des amandiers, mais les relevés sur 24 heures laissent supposer qu'il n'y a pas une distribution aléatoire pendant la journée. La plupart des mouvements aériens se produisirent entre 16 et 22 heures quand HR et vitesse du vent augmentaient et température diminuait. Les acariens et prédateurs ont été piégés sur des panneaux à 200 m du verger.
    Notes: Abstract Aerial dispersal of the phytoseiid Metaseiulus occidentalis (Nesbitt) was evaluated as a component in managing pesticide-resistant populations established in California almond orchards. Peak dispersal occurred in late July and early August during 1982 and 1983. Most predators (and spider mites) left the orchards on the prevailing winds from the northwest. Within the orchard, the prevailing winds had less influence, and dispersal was usually random. Both spider mites and predators dispersed randomly with regard to height from the almond trees, but data obtained during one 24-h interval suggest they do not disperse randomly throughout the day. Most aerial movements occurred between 16–22 h when relative humidity and wind speeds increased and temperatures decreased. Spider mites and predators were trapped on panels located 200 m from the orchard. A survey of carbaryl resistance levels in M. occidentalis collected from almond orchards surrounding the release sites indicates that carbaryl-resistant M. occidentalis dispersed at least 800 m between 1981–83. However, growers wishing to use the resistant strains should release them in their orchards as natural dispersal appears to be too slow. Migration of native M. occidentalis into the release sites appeared to be sufficiently rare that dilution of carbaryl-resistant populations was minimal during a 2–4 year period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366804
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  • 4
    Electronic Resource
    Electronic Resource
    Diapause behavior of genetically-improved strains of the spider mite predator Metaseiulus occidentalis (Acarina: Phytoseiidae) (1985)
    Springer
    Entomologia experimentalis et applicata 38 (1985), S. 113-120 
    Details
    ISSN: 1570-7458
    Keywords: diapause ; genetic improvement ; Metaseiulus occidentalis ; Tetranychus urticae ; Phytoseiidae ; Tetranychidae ; Acari ; glasshouse ; biological control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Au cours d'un programme destiné à évaluer la valeur du prédateur, Metaseiulus occidentalis Nesbitt pour lutter contre Tetranychus urticae Koch sur roses dans les serres de Berkeley (California) nous avons comparé chez deux souches le comportement lié à la diapause. Une souche a une diapause normale, l'autre a été sélectionnée génétiquement pour son absence de diapause. Les adultes avec diapause normale recherchent des abris sur un dispositif expérimental conçu à partir d'un pied de haricot. Les femelles perdant l'aptitude à la diapause ainsique celles de la souche normale soumise à une longue photophase ont tendance à se disperser par voie aérienne à partir du dispositif expérimental, surtout quand les proies sont rares. Les femelles de M. occidentalis aptes à la diapause élevées aux environs de la photophase critique (11.2h) avec des températures variant entre 17°5 et 24°5 pendant le nyctémère réagissent en fonction de la disponibilité en proies: quand les proies manquent, les prédateurs ont plus tendance à entrer en diapause que quand les proies sont abondantes. Avec une longue photopériode, les femelles à jeûn abandonnent le système expérimental, (probablement par dispersion aérienne) et les femelles fécondées se dispersent plus facilement que les mâles et les femelles vierges. Aucune différence dans la tendance à la dispersion aérienne n'a été observée aux courtes photophases. La dispersion aérienne des femelles adultes s'est produite à des vitesses de 1.5 m/sec.
    Notes: Abstract Diapause behaviou of two strains of Metaseiulus occidentalis (Nesbitt) was compared as part of a project to evaluate this predator as a control agent for Tetranychus urticae Koch on roses in greenhouses in Berkeley, California. One strain had a normal diapause and the other had been genetically selected for ‘non-diapause.’ Predators in diapause sought shelters on a simple bean plant test system. Females lacking the ability to diapause and the normal strain under long photophases tended to disperse aerially from the bean plant systems, particularly when prey were scarce. M. occidentalis females with the capacity to diapause reared near the critical photophase (11.2h) at fluctuating temperatures of 17.5 to 24.5°C within a 24 h period were influenced by the availability of prey: if prey were lacking, predators were more likely to enter diapause than if prey were abundant. Starved females left the plant system, probably through aerial dispersal, and mated females dispersed more readily than males and virgin females under long daylengths. No differences in aerial dispersal tendency were observed at short photophases. Aerial dispersal of adult females occurred at air speeds of ca. 1.5 m/s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361921
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  • 5
    Electronic Resource
    Electronic Resource
    Mode of inheritance of azinphosmethyl resistance in a laboratory-selected strain of Trioxys pallidus (1992)
    Springer
    Entomologia experimentalis et applicata 63 (1992), S. 229-236 
    Details
    ISSN: 1570-7458
    Keywords: Azinphosmethyl ; time response tests ; resistance ; Trioxys pallidus ; biological control ; genetic improvement ; Hymenoptera ; Aphidiidae ; gene amplification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Homogeneity in azinphosmethyl resistance was assessed in males of a laboratory-selected (Select-17) and susceptible (Yolo) colony of Trioxys pallidus Haliday (Hymenoptera: Aphidiidae) using a time response assay. No evidence of heterogeneity within the two colonies was found. Reciprocal crosses between the Yolo and the Select-19 (the Select-17 colony following two additional selections) colonies resulted in F1 females that exhibited a semidominant response to azinphosmethyl with a dominance value (D) of 0.32, as well as no evidence of maternal effects or sex linkage. Responses of F2 progeny to azinphosmethyl suggest that more than one gene may be involved because no inflection was observed in the time response lines of F2 males. Additional research is required to fully elucidate the mode of inheritance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192770
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