Reinfestation of an acaricide-treated apiary byVarroa jacobsoni Oud

Greatti, M.; Milani, N.; Nazzi, Francesco

doi:10.1007/bf01218569

Cited by 68 publications

(48 citation statements)

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“…One possibility is that the two colonies in the crowded group acquired their numerous mites by robbing honey from the nests of the weaker, mite-infested colonies in the area (Sakofski et al 1990;Greatti et al 1992;Frey et al 2011). Most years, there is a marked dearth of nectar in the Ithaca area in August.…”

Section: Discussionmentioning

confidence: 99%

Crowding honeybee colonies in apiaries can increase their vulnerability to the deadly ectoparasite Varroa destructor

2015

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-When humans switched from hunting honeybee colonies living scattered in the wild to keeping them in hives crowded in apiaries, they may have greatly increased disease transmission between colonies. The effects of clustering colonies were studied. Two groups of 12 colonies, with hives crowded or dispersed, were established in a common environment and left untreated for mites. Drones made many homing errors in the crowded group, but not in the dispersed group. In early summer, in both groups, the colonies that did not swarm developed high mite counts, but the colonies that swarmed maintained low mite counts. In late summer, in the crowded group but not in the dispersed group, the colonies that swarmed also developed high mite counts. All colonies with high mite counts in late summer died over winter; all colonies with low mite counts in late summer survived over winter. Evidently, swarming can reduce a colony's mite load, but when colonies are crowded in apiaries, this mite-load reduction is erased as mites are spread through drifting and robbing. apiary / Apis mellifera / crowding / drifting / evolutionary trap / parasitism / Varroa destructor

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Section: Discussionmentioning

confidence: 99%

Crowding honeybee colonies in apiaries can increase their vulnerability to the deadly ectoparasite Varroa destructor

2015

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“…This contradicts field experiments where non-treated colonies with infestation rates of more than 30% during summer do not have a chance to survive the following winter (Fries et al, 2003;Rosenkranz et al, 2006) on the one hand, but, on the other hand, figures similar to those obtained in the current study have also been observed in managed colonies in cold climate (Strange and Sheppard, 2001). The surviving monitoring colonies with high varroa infestation may, therefore, be victims of reinvasion after the production of winter bees (Goodwin et al, 2006;Greatti et al, 1992;Renz and Rosenkranz, 2001) or may have been free of secondary infection.…”

Section: Reasons For Colony Lossesmentioning

confidence: 99%

The German bee monitoring project: a long term study to understand periodically high winter losses of honey bee colonies

et al. 2010

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“…5) or from loss due to drone-laying or failing queens. This distinction is important, because horizontal mite transfer by robbing from highly infested colonies contributes to difficulties in mite control in warmer climates (Greatti et al, 1992;Sakofski, 1989). Our data suggest that under Nordic climatic conditions, most colonies that die due to mite infestations (or associated conditions) will be lost during winter, and, consequently, their mites die along with them.…”

Section: Colony Mortality and Mite Infestation Ratesmentioning

confidence: 99%

Swarming in honey bees (Apis mellifera) and Varroa destructor population development in Sweden

Fries

Hansen²,

Imdorf³

et al. 2003

Apidologie

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-In a honey bee population of 150 colonies, the development of an introduced Varroa destructor mite population was monitored in swarming and non-swarming colonies for two years in a Nordic climate. The results demonstrated a reduced mite population as a result of swarming only for the first swarm season studied. In the second swarm season, there were much higher mite levels (based on debris counts of mites) and fewer colonies swarmed, but there was no significant difference in infestation levels of adult bees in the fall between swarming and non-swarming colonies. This result was interpreted as an effect of host-parasite interactions, where the detrimental influence from the infestation prohibited growth (and swarming) in some colonies, but allowed better mite reproduction opportunities (and swarming) in others. Surprisingly, the mite infestation levels of swarms in the late fall were not significantly different from those of swarming colonies the same year, indicating that swarm survival may be almost as much affected by V. destructor, as intact, swarming colonies. No horizontal mite transfer through robbing was observed. The results suggest that, horizontal mite transfer may not be as important in a Nordic climate where many bee colonies die over winter along with their mites, as it is in warmer climates.Varroa destructor / Apis mellifera / swarming / survival / nordic climate / population dynamics

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Reinfestation of an acaricide-treated apiary byVarroa jacobsoni Oud

Cited by 68 publications

References 1 publication

Crowding honeybee colonies in apiaries can increase their vulnerability to the deadly ectoparasite Varroa destructor

Crowding honeybee colonies in apiaries can increase their vulnerability to the deadly ectoparasite Varroa destructor

The German bee monitoring project: a long term study to understand periodically high winter losses of honey bee colonies

Swarming in honey bees (Apis mellifera) and Varroa destructor population development in Sweden

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