Economic threshold for Varroa jacobsoni Oud. in the southeastern USA

Delaplane, Keith S.; Hood, W. Michael

doi:10.1051/apido:19990504

Cited by 76 publications

(62 citation statements)

References 13 publications

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“…The share of samples with threshold infestation levels in the ANL apiaries was also significantly lower in comparison to the ALL group (Chi 2 , p = 0.026). However, it should be noted that some of the colonies with high infestation rates of more than 7% (see ANL) were able to survive the winter which is consistent with the suggestion of researchers from the USA and Canada (Delaplane and Hood, 1999;Currie and Gatien, 2006). We have demonstrated that the loss rate of the colonies was also dependent on the number of co-occurring pathogens.…”

Section: Epidemiological Situationsupporting

confidence: 90%

A Comparative Study of Environmental Conditions, Bee Management and the Epidemiological Situation in Apiaries Varying in the Level of Colony Losses

Pohorecka

Bober

Skubida

et al. 2014

Journal of Apicultural Science

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A b s t r a c t Explaining the reasons for the increased mortality of the honey bee (Apis mellifera L.) in recent years, in Europe and North America, has become a global research priority in apicultural science. Our project was aimed at determining the relationship between environmental conditions, beekeeping techniques, the epidemiological situation of pathogens, and the mortality rate of bee colonies. Dead bee samples were collected by beekeepers from 2421 colonies. The samples were examined for the presence of V. destructor, Nosema spp. (Nosema apis and Nosema ceranae), chronic bee paralysis virus (CBPV), acute bee paralysis virus (ABPV), deformed wing virus (DWV), and Israeli acute paralysis virus (IAPV). Among the environmental and colony management factors under analysis, significant differences between apiaries with high (>10%), low (≤10%) or no losses of the colonies were only found in the case of the methods used by beekeepers to combat varroa mites. However, the epidemiological patterns in the case of V. destructor infestation and the DWV and ABPV infections highly differed. The data we obtained indicated that co-infections play a decisive role in the etiology of the significant collapse of colonies in apiaries in Poland. The main reason for this phenomenon can be described as strong infestation with V. destructor, followed by an intensive development of viral infections caused by DWV and (much less frequently) by ABPV. Despite a high prevalence of Nosema spp. microsporidia (with a dominant incidence of N. ceranae), a direct relationship between these parasites and the mortality rate of colonies was not proved.

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Section: Epidemiological Situationsupporting

confidence: 90%

A Comparative Study of Environmental Conditions, Bee Management and the Epidemiological Situation in Apiaries Varying in the Level of Colony Losses

Pohorecka

Bober

Skubida

et al. 2014

Journal of Apicultural Science

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“…On the other hand, non-infested colonies were probably weakened by the negative effect of repeated fluvalinate applications (Barbattini et al, 1989;Slabezki et al, 1991;Liu, 1992), meaning that the magnitude of the differences between non-infested and infested colonies may have been underestimated. Considering the entire experimental period, the daily finite rates of mite population increase were slightly lower (1.0123) than the ones also obtained in Mediterranean conditions by Kraus and Page [(1995); 1.0137 to 1.0214], Verdú [(1993, 1995) immigration rates (Branco et al, 1999;Delaplane and Hood, 1999)] or genetic (bee strain) variations.…”

Section: Discussionmentioning

confidence: 54%

Varroa destructor infestation impact on Apis mellifera carnica capped worker brood production, bee population and honey storage in a Mediterranean climate

Murilhas

2002

Apidologie

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-This study investigated the impact of Varroa destructor infestation on the amount of capped worker brood, the adult bee population and honey production of authenticated Apis mellifera carnica colonies kept in a Mediterranean climate. For this purpose, colonies were set-up and either maintained mite-free or artificially mite-infested and allowed to develop an infestation. Periodical evaluations of those colonies unravelled the pattern of the previously mentioned variables across the season, and allowed for comparative numerical analyses. Progressive reductions on the amount of capped worker brood, bee population and honey storage in mite-infested colonies only became increasingly evident during spring and summer, apparently associated with impressive mite population increases. By the end of the experiment, mite-infested colonies showed a unitary average reduction of 45% in the amount of capped honey they stored, meaning an average annual loss of Ϸ 24 kg of honey per colony. However, the amount of capped honey stored per bee and day was found to be independent from colony V. destructor status, indicating a lack of direct effect of mite infestation on honey hoarding behaviour.Varroa destructor / Apis mellifera /population dynamics / honey production

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“…I) were not within the action threshold of ca. 13 mites per 100 bees shown for the region by Delaplane and Hood (1999).…”

Section: Discussionmentioning

confidence: 99%

Small-cell comb foundation does not impede Varroa mite population growth in honey bee colonies

Berry

Owens²,

Delaplane

2009

Apidologie

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-In three independently replicated field studies, we compared biometrics of Varroa mite and honey bee populations in bee colonies housed on one of two brood cell types: small-cell (4.9 ± 0.08 mm cell width, walls inclusive) or conventional-cell (5.3 ± 0.04). In one of the studies, ending colony bee population was significantly higher in small-cell colonies (14994 ± 2494 bees) than conventional-cell (5653 ± 1082). However, small-cell colonies were significantly higher for mite population in brood (359.7 ± 87.4 vs. 134.5 ± 38.7), percentage of mite population in brood (49.4 ± 7.1 vs. 26.8 ± 6.7), and mites per 100 adult bees (5.1 ± 0.9 vs. 3.3 ± 0.5). With the three remaining ending Varroa population metrics, mean trends for small-cell were unfavorable. We conclude that small-cell comb technology does not impede Varroa population growth.Apis mellifera / Varroa destructor / IPM / comb / cell size

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Economic threshold for Varroa jacobsoni Oud. in the southeastern USA

Cited by 76 publications

References 13 publications

A Comparative Study of Environmental Conditions, Bee Management and the Epidemiological Situation in Apiaries Varying in the Level of Colony Losses

A Comparative Study of Environmental Conditions, Bee Management and the Epidemiological Situation in Apiaries Varying in the Level of Colony Losses

Varroa destructor infestation impact on Apis mellifera carnica capped worker brood production, bee population and honey storage in a Mediterranean climate

Small-cell comb foundation does not impede Varroa mite population growth in honey bee colonies

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