mite keeping 101€¦ · acute bee paralysis aka hairless black •caused by a virus vectored by...
TRANSCRIPT
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Varroa destructor
Mite Keeping 101
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Then
“Maybe if we procrastinate long enough, they’ll just go away.”
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Now
“Maybe if we procrastinate long enough, the Varroa mites will just go away.”
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Result of procrastination
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A nightmarish howl, fierce hot air typhoon, flying debris – kind of like the other debates.
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Chemicals in my hives! Are you serious?
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“James Bond” Method
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Treatment Free beekeeping is the ultimate goal
Genetics is the vehicle that gets you there..
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“Genetics will work if you have
about 500 years.”
Jerry HayesAmerican Bee Journal
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•Drifting
•Can’t control the drones the queen mates with
•Flowers previously visited by Varroa infected bees
Why 500 years?
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The hidden danger of pollination
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Treatment Free is the ultimate goal
This is what you can do now…
• Know your numbers
• Treat only if needed
• Verify efficacy of treatment
• Have a treatment back up plan
Treatment Free
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This program will tell you what you need to know about Varroa
mites and how to use this information to keep your bees
healthy
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So what is a mite?
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Varroa Mites are related to ticks Tick
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Mites are everywhere
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Varroa mites on honey bee
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Getting to know Varroa
Family Photo
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Varroa mites are found two ways in bee colonies
1. Phoretic Varroa mites are found on adult bees
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Varroa mites are found two ways in bee colonies
2. Reproductive Varroa mites in capped brood cells
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Varroa by Veto Pharma
Majority of Varroa mites in a hive are protected under capped brood
(phoretic)
(reproductive)
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What do Varroa mites and Tribbles (think Star Trek) have in common?
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• At least 1.45 new female mites in worker (female) brood
• At least 2.2 new female mites in drone (male) bee brood
They multiply astronomically
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Varroa exponential growth
Brood cycles(24 days for drones)
Meghan Milbrath
Save bees a lot of grief if treat here
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Why be concerned about Varroa?
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Biggest Concerns
• Varroa vector viruses
• Varroa can inhibit bees’ ability to overwinter
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Varroa vectors viruses
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Vector at Work
Humans get viruses (flu) So do bees
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Viruses
• A virus needs a host; can’t live without a bee
• The virus “hijacks” their host’s DNA and inserts their own instructions
• Virus compromises the bees’ immune system; makes them susceptible to a variety of problems
• Varroa mites carry the viruses and pass them on to the bees
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Rewriting genetic instructions
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Examples of Viruses: Deformed wings
DWS = deformed wing syndromeK-wing
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Another exampleAcute Bee Paralysis aka Hairless Black
• Caused by a virus vectored by Varroa mites
• Bee tremble and can not fly
• No treatment except varroa control
Normal bee
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Interferes with overwintering (Raising Fat Winter Bees)
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Varroa mites interfere with the bees’ ability to produce long-lived “fat”
bees necessary to overwinter
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What is a “fat” winter bee?
❖ Fat winter bees have lots of Vitellogenin
❖Vitellogenin = molecule the bees make consisting of proteins, fats and carbohydrates
❖ It is a food storage reservoirin bees’ bodies
❖Makes it possible for the winter bees to come out of metabolic retirement
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Protein
Water Carbohydrates
Building blocks for making Vitellogenin
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When you think Vitellogenin – think about chickens and egg yolks
YolkChicken
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Non-winter and winter Bees
Non-winter Bee: few fat
bodies Winter “fat” Bee: lots of fat bodies
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Vitellogenin = “fountain of youth” that prolongs bee lifespan so the colony
can overwinter
• Vitellogenin allows winter bees to survive for months rather than weeks
•Winter bees have to be able to switch roles back to nurse bees again to raise the next generation coming out of winter
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You create a Varroa bomb
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Bees with Varroa mites drift to neighboring hives
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Low Population = robbing
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You have to replace your bees
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• We’ve talked about the problem: Varroa mites
• Now let’s talk about what you can do
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The only way the Varroa mite can sneak up on you is if you are not watching
How to avoid a sneak attack
– Know the signs of Varroa
– Determine your mite numbers
– Make a treatment decision based on the numbers/trends
Know the signs of Varroa
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What are the indicators that the Varroa mites
are sneaking up on you and your bees?
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Bees crawling on the ground in front of the hive
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Varroa mites on sticky board
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Perforated caps
Infested capped brood
Not quite cappedPerforated cap
Normal capped brood
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Varroa mites visible on pupae
Varroa on drone pupa
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Normal Brood Pattern
Spotty Brood Pattern
Spotty brood pattern
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Indicators of viruses: deformed wings
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The only way the Varroa mite can sneak up on you is if you are not watching
How to avoid a sneak attack
– Know the signs of Varroa
– Make a treatment decision based on the numbers/trends
Determine your mite numbers
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+_______1
1
2 Much
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How do you confirm your colony’s mite load?
• How many are there?
• Are there too many?
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Varroa Management Concept #1
It’s not about knocking mite levels down- the trick is to never allow
them to get high in the first place.
Randy Oliver Scientific Beekeeping
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http://honeybeehealthcoalition/org/varroa
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Alcohol wash = Gold Standard Goal =Between 1 – 3%
Fall 1-3%
Spring 1%
Randy Oliver Scientificbeekeeping.com
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Gold standard: Sugar Shake
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Ether Roll
Randy Oliver at Scientific Beekeeping
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Brood Sampling
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Sticky Board in place only when sampling or treating
Sticky board: 24-hour natural dropLeast accurate tool; only gives you trend not numbers
Leave the Screened Bottom Board in place year round
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How are your mite numbers trending?The trend is what is important
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http://honeybeehealthcoalition/org/varroa
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How many mites =Treatment threshold
• Point at which the level of infestation is too high and it is time to treat
– Alcohol Wash = 1-3% (I use 1%)
– Sticky Board = What is the trend?
• The goal is to keep the numbers below the treatment threshold
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The only way the Varroa mite can sneak up on you is if you are not watching
How to avoid a sneak attack
– Know the signs of Varroa
– Determine your mite numbers
Make a treatment decision based on numbers/trends
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Have a treatment strategy
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One of the confusing things about selecting a miticide, is we have so many choices
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http://honeybeehealthcoalition/org/varroa
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The 4 four population phases of the honey bee/Varroa mite seasonal cycle
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Population Increase Phase (spring)• Bee population growing and expanding• Mite population usually low but increasing
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If I’m getting a package of bees, do I need to be concerned about treating for Varroa?
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Spring: Where bee and mite biology meet
• Colonies are broodless when they are in a package or a swarm (population increase)
• Mites’ strategy for survival is to reproduce and hide in capped brood
• Just about any of the mite control methods are appropriate now
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Do I need to treat?
• Existing hive: do a count to determine %
• Do a count for a package or swarm
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Remember the opportunity to treat mites in a swarm or package is limited
Day 1 Day 4 Day 10 Day 21
Treat before day 8/9 when cell is capped
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Spring
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Time of Year
Restrictions and Considerations
Advantages
Treatment time
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Api Life Var
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If you treat one colony, treat them all
• Varroa mites are like cigarette smoke
• Both can kill and
• Both spread by drifting
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What are your post treatment numbers?
Was the treatment effective?
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Questions to ask yourself if you didn’t get the result you wanted
• Did I follow the directions exactly? Example
• If I did what the directions ask, try another highly effective option
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Population Peak phase (summer)Corresponds to nectar flow
Bee population at peak; mite population increasing
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What if you need to treat during the population peak?
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Summer treatment option
Time of Year
RestrictionsAdvantages
Considerations
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MAQS (formic acid)
•Naturally occurring
•Effective on phoretic mites and those under capped brood
•Can use when honey supers present
•Temperature dependent
•Many cautions with use;follow application directions
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What do you do when your mite numbers are too high and
you have honey supers in place?
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Bees' Fall starts after nectar flow
Post honey harvest bee population decreasing; raising winter bees
Mite population growing, peaking then dwindling to phoretic when colony broodless
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Why is the best time to treat after the honey harvest?
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•Food resources dwindling and Varroa mites are increasing
•Bees need time to store energy (honey) and protein (Vitellogenin)for winter
•The bees need to raise multiple generations of bees with Vitellogenin to become “fat” winter bees (21 days per worker brood cycle)
We want to start raising “winter bees” after honey harvest
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Non-winter and winter Bees
Non-winter Bee: few fat
bodies Winter “fat” Bee: lots of fat bodies
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Think Multiple generations
“So what we want to dohere is take care of thebees that take care ofthe bees that go intowinter.” Kim Flottum
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Vitellogenin allows bees to be young again: come out of metabolic retirement
•Raise Babies•Care for Queen •Maintain Hive•Build Comb
•Protect Hive as Guard Bee
•Collect Nectar•Collect Pollen•Work Until Their Wings Wear Out
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What interferes with the bees’ ability to produce “fat” winter
bees?
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Fall can be precursor of winter losses or spring success
“The parasitic mite Varroa destructor remains the single most detrimental pest of honey
bees, and is closely associated with overwintering colony declines.”
Report on the National Stakeholders Conference on Honeybee Health
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Population Decrease (fall) A perfect storm: skyrocketing ratio of mites to bees
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How does this perfect storm affect the rearing of “fat” winter bees?
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Varroa infestation
• Bees make Vitellogenin just like they make royal jelly
• Without Vitellogenin the colony does not overwinterwell if at all = – No winter bees
– No colony survival
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Fall: Population Decrease
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Fall
Time of Year
RestrictionsAdvantages
Considerations
Courtesy of Jen Holt
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Why are your post treatment numbers
important?
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Start Treatment
Latest start to treatment and still have time for back up treatment plan
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Too late!
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No brood and mites are phoretic
Winter: Dormant phase
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Winter: Opportunity
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Winter: dormant phase
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winter
Time of Year
RestrictionsAdvantages
Disadvantages
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Dormant/Winter: Oxalic Acid
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Oxalic acid, found in spinach, made Popeye strong; it can do the same for
your winter bees
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Why Oxalic Acid?•Varroa mites are all phoretic
which means you can get them all
•No brood for Varroa mites to hide in
•So far no resistance to it
•Inexpensive
•Last chance to control varroa mites
Brushy Mountain
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Oxalic Fumigation Application • Slightly more effective
• Requires extra equipment
✓Vaporizer tool
✓Battery to power it
• Corrosive: Dangerous to lungs, eyes
• Need protective clothing and nitrile gloves
• Requires goggles, respirator
• Follow directions exactly
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Solution/Dribble application(sugar syrup)
• Equipment: syringe or applicator
• Requires nitrile gloves, protective goggles
• Dangerous to eyes; wear gloves to keep hands away from face
• Follow directions exactly
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Be Proactive: Control Varroa
There is no “one-size-fits-all” solutionfor Varroa management. Choose
an approach that fits you.
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T Take Home Messages
• Know your mite loads whether you plan to treat or not
• Know your mite load at the time you treat & post treatment
• Follow the product directions EXACTLY
• Talk to experienced, successful beekeepers to learn what has worked for them
• Ultimately it is your decision
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Varroa destructorYour Bee HiveAny Place, USA
OREGON ClassK
Restrictions
Untreated Hives
Don’t Give Varroa a License to Kill!
License to Kill
00753276 Expires NOW
Varroa destructorYour Bee Hive
OREGON ClassK
Restrictions
Untreated Hives
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The End
Photo: Suzanne Jurgens
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Questions?
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References
• Scientificbeekeeping.com
• Randy Oliver’s website
• http://honeybeehealthcoalition/org/varroa
• Tools for Varroa Management