Effects of delayed acaricide treatment in honey bee colonies parasitized by<i>Varroa jacobsoni</i>and a late-season treatment threshold for the south-eastern USA

Delaplane, Keith S.; Hood, W. Michael

doi:10.1080/00218839.1997.11100938

Cited by 62 publications

(66 citation statements)

References 15 publications

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“…represent a tolerable level, we must also identify levels that are damaging. Our earlier work with first-year colonies [9] established that late-season mite populations of 6 662 exceed economic threshold, and in the present study mite populations approaching 6 000 were associated with decreasing bee populations and increasing brood disease in September-October and poor colony condition the following January (table I).…”

Section: Methodsmentioning

confidence: 68%

“…This present paper is part of a project to develop researchbased economic thresholds for the Piedmont region of the southeastern USA under a variety of beekeeping conditions. In earlier work we established a threshold for first-year colonies set up from mail-order packages [9]. In this paper we present experimental evidence of an economic threshold for mature overwintered colonies under conditions that encourage mite immigration (1997) or discourage it (1998).…”

Section: Introductionmentioning

confidence: 88%

“…Thus, we believe that this type of research should be replicated in other regions. Our protocols described here and earlier [9] [9]. Bottom board inserts is generally regarded as the more reliable sampling method [12,13] © Inra/DIB/AGIB/Elsevier, Paris…”

Section: Methodsmentioning

confidence: 99%

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Economic threshold for Varroa jacobsoni Oud. in the southeastern USA

Delaplane

Hood

1999

Apidologie

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-This research was designed to determine economic thresholds for Varroa jacobsoni mites in mature overwintered colonies under conditions that encourage or discourage mite immigration. Congruent data from the present study and our earlier work suggest that a true late-season (August) economic threshold for mites in the southeastern USA lies within a range of mite populations of 3 172-4 261, ether roll mite levels of 15-38, and overnight bottom board insert mite levels of 59-187 in colonies with bee populations of 24 808-33 699. Overwintering colonies can benefit from an additional early-season (February) treatment. This benefit was realized in colonies which in February had the following average values: mite populations 7-97, ether roll 0.4-2.8, bottom board inserts 0.6-10.2 and bee populations 12 606-13 500. Continuous acaricide treatment never achieved colony bee populations or brood number significantly higher than in colonies treated more conservatively. There is evidence that minimizing mite immigration has the benefit of delaying the onset of economic thresholds. © Inra/DIB/AGIB/Elsevier, Paris

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Section: Methodsmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 88%

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Economic threshold for Varroa jacobsoni Oud. in the southeastern USA

Delaplane

Hood

1999

Apidologie

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“…The recent detection of varroa populations that are resistant to Apistan (tau fluvalinate) also supports the need to minimize the frequency of chemical treatments by only applying acaricides when mite populations reach economic levels (Baxter et al, 1998, Elzen et al, 1999. Delaplane & Hood (1997) provided a research-based economic threshold for varroa in south-eastern USA. However, many beekeepers still rely on the calendar to determine when to apply treatments, and more research on economic thresholds is needed.…”

Section: Introductionmentioning

confidence: 99%

Using inert dusts to detect and assess varroa infestations in honey bee colonies

Macedo

Ellis

2002

Journal of Apicultural Research

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SUMMARYDetection and assessment of varroa infestations in honey bee colonies are important for successful beekeeping. We examined the use of inert dusts to dislodge mites from adult honey bees that were isolated from their nest. Six dusts (powdered sugar, fine sugar, wheat flour, talcum powder, corn starch and baking soda) were evaluated for their ability to dislodge mites from adult bees collected in jars. We obtained the highest recovery rate with powdered sugar (92.9 ± 5.5%) and talcum powder (84.0 ± 5.6%). We also examined mite survival after recovery with inert dusts and compared it to mite survival after recovery from brood. After 24 h mite survival was significantly greater when mites were recovered with corn starch, powdered sugar, and from brood (F = 22.88, d.f. = 6,35, P <0.0001). Finally, ether and powdered sugar were compared as tools for detecting and assessing the degree of infestation. Powdered sugar did not differ from ether in detecting or assessing low (1-5 mites per sample) infestation levels (F = 2.81, d.f. = 1,49, P = 0.1). At medium (6-30 mites per sample) and high (> 30 mites per sample) infestation levels, more mites were recovered with powdered sugar (medium: F = 14.28, d.f. = 1,29, P = 0.008; high: F = 6.34, d.f. = 1,17, P = 0.023).

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“…Application of synthetic acaricides is the most effective method against these pests. However, the intensive use of many chemical substances against mites has led to the development of resistance and the reduction of its effects (Delaplane and Hood, 1997;Milani, 1999). Furthermore, contamination of the hive products, especially honey and beeswax, lead to the idea of finding new and safer ways to control honey bee mites (Wallner, 1999).…”

Section: Introductionmentioning

confidence: 99%

Plant Essential Oils Used Against Some Bee Diseases

Tutun

Koç

Kart

2018

Turkish JAF Sci.Tech.

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The most common honey bee diseases are American foulbrood (AFB) caused by the bacterium Paenibacillus larvae, Chalkbrood caused by fungus Ascosphaera apis and diseases caused by parasitic mites such as Acarapis woodi, Varroa destructor. These diseases and pests not only cause economic loss but also cause ecological problems related to the role of honey bees, as the most important pollinators on Earth. Synthetic acaricides and antibiotics are used to keep the diseases and mites in control. Use of the drugs lead to the development of drug-resistant organisms, detrimental effect on non-target organisms and the residue problem in bee products. For this reasons, the need for alternative control methods has become compulsory in recent years. It has been known that some plant oils used widely in perfumery and food industry for flavor and smell have been used as repellent to certain insects, bactericide and fungicide. Therefore, intensive studies have been carried out on plants with anti-mites, antibacterial and antifungal potentials and these studies are still going on. Recently, studies in this area have shown that essential oils of plants such as thyme, cloves, mint, lemon grass, cinnamon, grapefruit, rosemary, marigold, are lethal to some mites, bacteria and fungi. In addition, it has been reported that some components, isolated from these plants such as sanguinarine, thymoquinone, capsaicin, carvacrol, citral, eugenol, thymol, show these effects on the organisms. As a result, in countries rich in biodiversity due to endemic plant species, the essential oils used in control of these diseases should be favored instead of or in combination with conventional drugs in integrated the disease management programs because of the lack of harmful effects of essential oils on non-target organisms and environment.

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Effects of delayed acaricide treatment in honey bee colonies parasitized byVarroa jacobsoniand a late-season treatment threshold for the south-eastern USA

Cited by 62 publications

References 15 publications

Economic threshold for Varroa jacobsoni Oud. in the southeastern USA

Economic threshold for Varroa jacobsoni Oud. in the southeastern USA

Using inert dusts to detect and assess varroa infestations in honey bee colonies

Plant Essential Oils Used Against Some Bee Diseases

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