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Experimental & Applied Acarology

, Volume 16, Issue 4, pp 279–286 | Cite as

Reinfestation of an acaricide-treated apiary byVarroa jacobsoni Oud

  • M. Greatti
  • N. Milani
  • F. Nazzi
Article

Abstract

The sources of reinfestation of a treated apiary byVarroa jacobsoni Oud. were studied in Friuli (North-Eastern Italy), in an area with a high density of colonies. Ten colonies, initiallyVarroa-free, were treated with Apistan or Bayvarol strips and mites killed by these treatments were counted twice a week for 1 year. Five hives were provided with “drone excluders”, to avoid the entrance of drones from other apiaries. Nectar and honeydew flow were monitored.

The reinfestation rate was low during spring, varied between 1.6–13.7 mites/day/colony during June, July and first week of August, and rose impressively during September and October (up to a mean of 75.6 mites/day/colony); it was relatively high when nectar flow was scarce. The presence of drone excluders did not help to limit the number of mites imported: drones did not seem to be the main cause of reinfestation. The coincidence between the increase in the reinfestation rate and the scarcity of nectar flow and the massive importation of mites, observed especially in September and October, suggest that reinfestation was mainly caused by robbing of infested colonies (mostly feral swarms) by the bees of treated colonies.

Keywords

Nectar Flow Massive Importation Treated Coloni Infested Coloni Bayvarol 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Barbattini R., Greatti M., Iob, M., Sabatini, A.G., Marcazzan, G.L. and Colombo R., 1991. Osservazioni suMetcalfa pruinosa (Say) e indagine sulle caratteristiche del miele derivato dalla sua melata. Apicoltura, 7: 113–135.Google Scholar
  2. Borneck, R. and Merle, B., 1989. New tests forVarroa control with Apistan (fluvalinate). In: R. Cavalloro (Editor), Present status of varroatosis in Europe and progress in theVarroa mite control, Proc. Meet. EC Experts' Group, Udine (Italy), 28–30 November 1988. C.E.C., Luxembourg, pp. 315–330.Google Scholar
  3. Frilli, F., 1982.Varroa jacobsoni Oudemans: un attuale pericolo per l'apicoltura friulana. Atti Accad. Scienze Lettere Arti Udine, 75: 117–134.Google Scholar
  4. Hüttinger, E. and Pechhacker, H., 1988. Der Verflug von Arbeitsbienen und Drohnen. Bienenwelt, 30: 173–179.Google Scholar
  5. Hüttinger, E., Pechhacker, H., Sulimanović, D. and Tomać, I., 1981. Zur ausbreitung vonVarroa jacobsoni Oud. von Volk zu Volk. In: Diagnose und Therapie der Varroatose, Proc. Int. Symp. Bienenbiologie und-pathologie, Oberursel/Bad Homburg (Germany), 29 September-1 October 1980. Apimondia, Bucharest, pp. 56–62.Google Scholar
  6. Imdorf, A. and Kilchenmann, V., 1991. La réinvasion de varroas: une mauvaise suprise pour l'apiculteur. Rev. Suisse Apicolt., 88: 106–111.Google Scholar
  7. Marchetti, S. and D'Agaro, M., 1986. Perizin liquid, a systemic agent for the chemical control of varroatosis. Apicoltura, 2: 67–76.Google Scholar
  8. Marchetti, S., Frilli, F. and D'Agaro, M., 1988. Reinfestation rates of varroatosis after treatments in brood-free honeybee colonies. In: R. Cavalloro (Editor), European research on varroatosis control, Proc. Meet. EC Experts' Group, Bad Homburg (Germany), 15–17 October 1986. Balkema, Rotterdam, pp. 145–156.Google Scholar
  9. Milani, N., 1990. Reinfestazione daVarroa jacobsoni: un problema sempre più grave. Agricoltura Informazione, 5 (3): 7.Google Scholar
  10. Milani, N. and Barbattini, R., 1989. Treatment of varroatosis with Bayvarol strips (flumethrin) in Northern Italy. Apicoltura, 5: 173–192.Google Scholar
  11. Rademacher, E., Böttcher, H. and Pekel, M., 1989. Control of varroatosis in Berlin (West), a region exposed to high invasion pressure. In: R. Cavalloro (Editor), Present status of varroatosis in Europe and progress in theVarroa mite control, Proc. Meet. EC Experts' Group, Udine (Italy), 28–30 November 1988. C.E.C., Luxembourg, pp. 183–191.Google Scholar
  12. Ritter, W. and Leclercq, E., 1987. Entwicklung der Bienen-und Varroamilben-Population in Gebieten mit unterschiedlichen Möglichkeiten der Reinvasion. Tierärztliche Umschau, 42: 548–551.Google Scholar
  13. Sakofski, F., 1989. Transfer ofVarroa jacobsoni by robbing. In: R. Cavalloro (Editor), Present status of varroatosis in Europe and progress in theVarroa mite control, Proc. Meet. EC Experts' Group, Udine (Italy), 28–30 November 1988. C.E.C., Luxembourg, pp. 177–192.Google Scholar
  14. Sakofski, F. and Koeniger, N., 1988. Natural transfer ofVarroa jacobsoni among honeybee colonies in autumn. In: R. Cavalloro (Editor), European research on varroatosis control, Proc. Meet. EC Experts' Group, Bad Homburg 15–17 October 1986. Balkema, Rotterdam, pp. 81–84.Google Scholar
  15. Sakofski, F., Koeniger, N. and Fuchs, S., 1990. Seasonality of honey bee invasion byVarroa jacobsoni Oud. Apidologie, 21: 547–550.Google Scholar
  16. Simonetti, G., Frilli, F., Barbattini, R. and Iob, M., 1989. Flora di interesse apistico. Apicoltura, Appendice, 5: 1–377.Google Scholar

Copyright information

© Elsevier Science Publishers B.V. 1993

Authors and Affiliations

  • M. Greatti
    • 1
  • N. Milani
    • 1
  • F. Nazzi
    • 1
  1. 1.Dipartimento di Biologia Applicata alla Difesa delle PianteUniversità di UdineUdineItaly

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