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Reinfestation of apiaries after treatment: a frequent cause of failure in the control of Varroa jacobsoni


, : Reinfestation of apiaries after treatment: a frequent cause of failure in the control of Varroa jacobsoni. Ape Nostra Amica 15(5): 4-5, 7-9

The results of an experiment carried out in NE Italy are given. Ten colonies, initially free of V. jacobsoni, were treated during the course of one year with various long-lasting acaricides. Incoming mites, killed by the treatments, were counted twice per week. Drone excluders were fitted to 5 hives to prevent drones from entering but this did not affect reinfestation.

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Related references

Nazzi, F.; Greatti, M.; Milani, N., 1995: The reinfestation of treated apiaries by Varroa jacobsoni Oud.: seasonal trend and statistical aspects. Reinfestation was monitored in 2 acaricide-treated apiaries in areas with different conditions. From the end of May to the end of July, the daily average reinfestation rate (mites/hive) was 1-5; it then increased to a maximum of 11.3 in the first...

Dujin, T.; Jovanovic, V.; Savic, M.; Suvakov, D., 1989: Studies on methods and therapeutic agents used to control Varroa jacobsoni in large apiaries: effects of amitraz-based preparations. In commercial apiaries in Yugoslavia honey bee colonies are treated several times during late summer and autumn. Both amitraz-based preparations, Varescens and Varamit, were effective in trials, with no apparent adverse effects on the bees.

Dujin, T.; Jovanovic, V.; Suvakov, D., 1990: Studies on methods and therapeutic agents used to control Varroa jacobsoni in large apiaries. III. Results of a four-year study on amitraz-based preparations. The study described previously [Veterinarski Glasnik (1990) 44 (3/4) 261-274] was continued for a further year, without V. jacobsoni developing resistance to amitraz and apparently without any adverse effects on the bees in the test apiary (80-120...

Greatti, M.; Milani, N.; Nazzi, F., 1992: Reinfestation of an acaricide-treated apiary by Varroa jacobsoni Oud. The sources of reinfestation of a treated apiary by Varroa jacobsoni were studied during 1990-91 in Friuli, Italy, in an area with a high density of bee [Apis sp.] colonies. Ten colonies, initially Varroa-free, were treated with Apistan [fluvalina...

Dujin, T.; Jovanovic, V.; Savic, M.; Suvakov, D., 1990: Studies on methods and therapeutic agents used to control Varroa jacobsoni in large apiaries. II. Results of a three-year study on the effect of amitraz-based preparations. Recommendations for treating V. jacobsoni infestations are made, based on the results of a 3-year study in Yugoslavia. Colonies should be smoked with an amitraz-based preparation 2-4 times in late winter and early spring. It treatment starts late,...

Duranville, C.; Miniggio, C.; Arnold, G.; Borneck, R., 1991: Drifting of foragers and reinfestation of colonies of honey bees by Varroa jacobsoni. Drifting between Apis mellifera colonies was studied by introducing marked bees into certain colonies (infested or not infested) and recording their presence later in other colonies, at various distances away. It was concluded that drifting forage...

Rakhmanin, P.; Popov, E.; Smirnov, A.; Grobov, O., 1981: Measures for elimination of Varroa jacobsoni infestations from apiaries. Pchelovodstvo (4 5) 29-32

Fries, I., 1991: Formic acid treatment and biotechnical methods for control of varroa mites (Varroa jacobsoni) in honey bee colonies. This report describes results from field tests with different control methods, mainly different ways of using formic acid and the 'trapping comb' technique. In some of the studies the bees have been in these tests for 3 years. The result...

Colin, M.E.; Vandame, R.; Jourdan, P.; Pasquale, S. di, 1997: Fluvalinate resistance of Varroa jacobsoni Oudemans (Acari : Varroidae) in Mediterranean apiaries of France. The susceptibility of populations of Varroa jacobsoni to fluvalinate, the most commonly used acaricide for control, was determined. Mortality was recorded after 24 h exposure on the bottoms of Petri dishes treated with fluvalinate (as Klartan EC)...

Colin, M.E.; Vandame, R.; Jourdan, P.; Di-Pasquale, S., 1997: Fluvalinate resistance of Varroa jacobsoni Oudemans (Acari: Varroidae) in Mediterrranean apiaries of France. For control of Varroa jacobsoni Oudemans, a parasite of the honey bee (Apis mellifera L.), we evaluated the level of susceptibility of mite populations to the most common acaricide (fluvalinate). Mortality was recorded after 24 h exposure on the b...