General overview of bee diseases
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1 General overview of bee diseases Wolfgang Ritter CVUA Freiburg/Animal Health Head of International OIE Reference Laboratory President of Apimondia Standing Commission for Bee Health
2 Honeybee Colony = Animal Honeybee colony = Animal Individual bees = part of the animal (like cells or organs of mammals)
3 North Africa Central Europe Jan. Juni Dez.
4 Brood development 3 days 5 days 14 days
5 Hatching of imagos after 20 to 22 days
6 Bee swarm = Reproduction
7 Honeybee Colony = Superorganism Division of labour Interaction Food hoarding Social Homoiothermic Social immune defence Hygienic behaviour
8 Immune defence mechanisms Individual Bee Cellular system: Melanisation, phagocytosis etc. Humoral immune system: Inhibition, lyses of cell wall etc.
9 Social immune defence Hygienic Behaviour Absconding: Bees fly out and do not return Swarming: Whole colony leaves hive Disinfections: Nest with propollis Propollis: resinous mixture that honey bees collect from tree buds and others
10 Social immune defence Hygienic Behaviour Grooming: Self- and social-cleansing Hygienic: Removal of brood Heating: Fever and heat attack Encapsulation: Enemies and infection sources
11 Factors reducing Immune response Nutrition Lack of permanent carbohydrate supply Low diversity of pollen sources Pollution Pesticides Air pollution Management (good beekeeping practices) Chemical treatments Damage of natural arrangements in brood nest Inadequate bee races (brood cycle etc.)
12 Biodiversity of pollen supply Pollen supplies bees with: protein + fungus + bacteria
13 Antagonists and infectibility Antagonists Bacteria Fungus Chalkbrood (Ascosphaera apis) Fungus tube ( Nayudu, Khan 2007)
14 Diversity of bacteria in midgut ( Nayudu, Khan 2007) In healthy honey bee colonies per midgut: 100 mill. to 1000 mill. 25 bis 30 species (10 bis 20 % inhibit chalkbrood) In diseased honey bee colonies per midgut : to bis 15 species
15 Pesticides Acute toxic effects Sublethal effects
16 Beekeeping practice Chemical treatment with desinfective effects Synthetic substances Organc acids Etheric oils bacteria fungus antagonistic substances
17 Beekeeping practice Fixed combs to moveable frames
18 Important diseases of brood and imago Pathogen Brood Imago Bacteria AFB/EFB Fungi Chalkbrood Nosema Viruses Mites Sacbrood (SBV) Varroa, Tropilaelaps DWV,CBPV Varroa, Acarapis Insects SH Beetle A.m. capensis
19 Multiple infections Varroa-infestation/ABP-Virus-infection DWV 60 % Bienen Treatament Varroa mite 0 Mai Juni Juli August September
20 Pathogenesis Individual bees Reduction of lifespan Morphological changes Physiological changes Changes in behaviour
21 Reduction of lifespan 3 weeks 2 weeks 2 weeks 1 week
22 Morphological changes
23 Physiological changes Changes in behaviour AP-Virus
24 Pathogenesis bee colony Reduced productivity Scattered brood Dwindling Death
25 Scattered brood
26 Scattered Brood Hygenic Behaviour Recognition and removal of diseased brood
27 Adult Bee Diseases Hygenic Behaviour leaving and do not return
28 Dwindling Unbalanced: bee production and bee losses
29 Colony Collapse disorder (CCD)
30 Epidemiology Influence of bees Robbing Drifting
31 Density of bee colonies
32 Distribution of diseases in bee yard 2 d 6 d 6 d Viruses + 4 d 6 d 2d
33 Distribution of diseases in flight area 2 km 1 km 60 d 25 d Viruses
34 Epidemiology Influence of beekeeper Exchange of material Migratory beekeeping Bee trade
35 Exchange of combs honey harvest
36 Almond Migratory bee keeping J.Pettis
37 Host shifts caused by man Varroa destructor Host-parasite relationship: not adapted in co-evolution
38 Globally spreading of diseases Varroosis
39 Distribution of Apis before colonisation Apis cerana Apis mellifera
40 Distribution of Apis during colonisation Apis cerana Apis mellifera
41 Current distribution of Apis Apis mellifera Apis cerana
42 Current distribution of Varroa destructor
43 Globally spreading of Diseases Varroosis
44 Distribution of Aethina tumida
45 Natürliche Abwehr
46 Distribution of Aethina tumida
47 Host shifts caused by man Nosema ceranae Original parasite of Apis cerana Nosema apis Original parasite of Apis mellifera N. apis replaced by N. ceranae new pathogenesis?
48 Current distribution of Nosema ceranae Nosema ceranae Apis cerana (Nosema apis) Nosema ceranae Apis mellifera
49 Host shifts caused by man Tropilaelaps spp. Not jet distributed outside of south east Asia
50 Current distribution of Tropilaelaps spp. Apis dorsata Apis laboriosa Apis cerana Apis mellifera Tropilaelaps spp.
51 Apis dorsata
52 Tropilaelaps spp.
53 Tropilaelaps spp.
54 Introduction of new honeybee races by man Africanized honey bee (Killer bees) Apis mellifera capensis
55 Africanized honey bee Apis mellifera scutelata
56 Apis mellifera capensis
57 Migratory bee keeping local and global trade with bees causes increasing problems for bee health
58 OIE List Pathogen Bacteria Fungi Viruses Mites Insects List of OIE American/European Foulbrood (Nosemosis) (SBV, DWV, CBPV) Acarapisosis, Varroosis, Tropilaelaps spp. Small Hive Beatle
59
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