integrated pest management for beekeepers: afb and varroa · holst milk test only works if viable...
TRANSCRIPT
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IPM
Integrated Pest ManagementFor Beekeepers:AFB and Varroa
Prepared by Landi Simone
For the Essex County Beekeepers
Society
May 12, 2007
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IPM means:
LOOK BEFORE YOU TREAT!
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INTEGRATED
Multifaceted approach to dealing with pests
Integrate many different management techniques, including physical or mechanical, biological, cultural, chemical
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PEST
Includes true pests such as wax moth Parasites such as the Varroa mite Pathogens such as AFB Predators such as bears
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MANAGEMENT
NOT eradication (except AFB) In IPM, we determine tolerable levels of
pest populations and permit pests to exist below these levels.
We use the least invasive, injurious or toxic control methods first.
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Components of an IPM Program
MonitorPest
Levels
UnderstandLife Cycle
Pest Identification Determine TreatmentLevel
Direct Methods(Usually
chemical)
IndirectMethods
(Physical, mechanical,biological, cultural)
Determine TreatmentStragegy
Apply Treatment Evaluate andRedesign
IPMComponents
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American Foulbrood
Pest Identification Bacterial disease:
Paenibacillus larvae Infects <1% of
managed US colonies
Causes >$5M in damage annually in US
Two Stages: Vegetative Spore (scale)
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Symptoms (at individual level)
AFB only infects worker larvae, not drone.
Larvae die in upright position just after capping.
Infected brood are dull yellow or coffee-colored
Pupae that have died in capped cell may have proboscis sticking up (pupal tongue). This is DIAGNOSTIC.
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Symptoms at Colony Level
Cappings appear greasy and shrunken
“Pepperbox” brood pattern with punctured cappings
May have distinctive molasses-like smell
Dead brood dry into hard-to-remove scales that are a major source of infection.
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Conditions that Mimic AFB
Chilled brood (but all stages of dead brood are present
European Foulbrood (but larvae die before capping)
Parasitic Mite Syndrome PMS (but lacks scale)
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Diagnosing AFB
Ropiness Test (only works for vegetative state)
Holst Milk Test (only works if spores are present)
Vita AFB Diagnostic Kit Send sample to Beltsville Bee Lab
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Ropiness Test
Remove capping & insert clean, dry toothpick.
Stir and slowly withdraw.
If larval remains stretch out at least an inch, AFB is likely present.
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Holst Milk Test
Only works if viable spores are present Can get false negatives but not false positives Make skim milk solution by adding 1/2 tsp.
powdered milk to 50 ml of water (or follow package directions.)
Scale or larva is placed in 3 to 4 ml of skim milk solution and warmed for 10 to 20 minutes to at least 98°. If solution becomes clear, AFB is present
Bacteria produce proteolytic acid, which reacts with skim milk.
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Laboratory Diagnosis - Free!
Send a 4” x 4” sample of brood comb (no bees, please) wrapped in newspaper to:
USDABee Disease DiagnosisBee Research LaboratoryBuilding 476, BARC-ERoom 204Beltsville, MD 20705
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Life Cycle of AFB
Spores (non-active stage present in scale) are major means of spreading
Spores are viable for >70 years Housecleaning bees ingest spores while
cleaning scale, transfer to nurse bees. Nurse bees feed spores to larvae.
LD50 = 35 spores for 1 day old larva LD50 > 1 million spores for 2 day old larva
Larvae are immune at 53 hours. Adult bees are immune.
One scale contains 2.5 billion spores.
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Spores Can Be Spread to Honey
Never, ever feed your bees honey from an unknown source.
>90% of commercial honey contains AFB spores.
Adult bees eating honey with spores will defecate spores out of the hive.
Sunlight kills spores (but not deep in scale); rain leaches spores into soil.
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Spread of AFB
By bees: Primary mechanism is robbing By beekeepers:
Transferring comb, especially brood Transferring wet extracted supers Buying and using used equipment
Never use frames of drawn comb from an unknown source
Scorch used woodenware to burn propolis and wax Hive tools and gloves.
Don’t use gloves Clean hive tools by scraping and scorching Dedicate hive tools to apiaries
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Spread of AFB
In packages and swarms (not high risk) Both can contain AFB but risk is low.
Safest bet is to hive on foundation and not feed for 3 days. Any spores present will go into making new wax.
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Cultural IPM Techniques for AFB Clean hive tools with propane torch between
hives; dedicate hive tools to apiaries Don’t wear gloves Put wet supers back on hives they came
from. In larger operations, return wet supers to their apiary of origin.
Cull old comb every 5 years (good practice for many pathogens)
Examine colonies carefully before transferring brood comb
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Prevent AFB using Cultural IPM Techniques
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Biological IPM Techniques for AFB Use resistant strains of bees
In 1964 Rothenbuler did early work on hygienic behavior in honey bees
Marla Spivak, University of Minnesota, revived and is expanding on this work
Hygienic bees detect diseased brood right through the capping and remove it before it can spread throughout the colony.
Hygienic bees are highly resistant to AFB (>90%) and to chalkbrood. They have moderately good resistance to Varroa mites.
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Hygienic Behavior in Bees
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Testing for Hygienic Behavior
Freeze a section of brood and return it to the frame. After 24 hours,
Observe how much of the dead brood has been removed.
HygienicNot Hygienic
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Treatment Thresholds for AFB
Zero Tolerance Policy No level of AFB is acceptable. Infected hives
should be burned. Use of terramycin prophylactically breeds
resistant AFB. Top bee experts in the country recommend terramycin NEVER be used this way. Terramycin masks symptoms by killing vegetative state but not spores.
New antibiotic, Tylosin, available only by prescription. Not available for prophylactic use.
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Destroying AFB
Seal hive Kill bees by adding 7
Tbsp. dish liquid to 5 gallons water and pouring on hive.
Burn
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Alternate (Saving Adult Bees)
Shook-swarm adult bees At night, away from
other hives, onto foundation
Quarantine for at least 18 months
Scorch equipment and burn or bury frames
Give terramycin.
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IPM for Varroa destructor
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Pest Identification: Historical
Varroa destructor (formerly thought to be Varroa jacobsoni) arrived in U.S. in 1987.
Native to Apis cerana Migrated to Apis
mellifera in the far east Brought to So. America
by migratory beekeepers via Japan
Has changed the face of beekeeping in America.
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Varroa: Pest Identification
Small pin-head size 8-legged brown to reddish brown parasite sucks hemolymph from bees
Present in almost all U.S. colonies and in most countries
Left untreated, will cause colony collapse within 2 years
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Varroa: Life Cycle
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Life Cycle of Varroa destructor
Adult female mite feeds on bees 5-13 days then enters brood cell 24 to 60 hours before capping.
Lays first egg 60 hours after capping, then every 30 hours thereafter
First mite to emerge is male. Subsequent mites are female, which mate with male and feed on pupa
Mature females emerge with bee; immatures and male remain in cell and die
Mites are transferred bee to bee in brood nest; prefer nurse bees for cell access
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Why Mites Prefer Drone Brood
Worker Drone Queen
DaysCapped
12 - 12.5 13 - 16 8
Average #Of ViableMites
1.3 - 1.4 2.2 - 2.6 0
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Effects of Varroa: Individual Bee
Workers Life span reduced by 50% (especially
bad for overwintering bees) Food and wax glands damaged Reduced disease resistance
Drones Reduced sperm count Less likely to mate successfully
BAD QUEENS
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Effects of Varroa: Colony Level
Pierced exoskeleton permits entry of multiple viruses normally present but dormant in the hive
PMS: Parasitic Mite Syndrome. Easily confused with foulbrood
Colony collapses under viral load, usually in late summer-fall
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So How Do I Know if my Bees Have Varroa Mites????
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Monitoring Pest Levels: Ether Roll Still used in some
states but kills bees Powdered sugar roll
has replaced in most areas
200-300 bees in jar, spray 2-3 secs with lighter fluid, shake & roll. Count mites on side of jar.
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Monitoring Pest Levels: Powdered Sugar Roll Add 400 bees (about 2
fingers) in a quart mason jar with hardware mesh screen on top
Add 1 Tbsp. powdered sugar & shake
Pour out sugar onto white paper
Count mites Release bees
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Monitoring Pest Levels: Sticky Boards
Easiest to use with a screened bottom board (SBB) but can be used without
Use commercial sticky board or use homemade marlite or plastic smeared with petroleum jelly
Place below screen for 1 to 3 days
Count mites Convert to equivalent 24
hour count
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Determine Treatment Thresholds
At a minimum, sample from late July to mid-August: 24-hour natural fall on sticky board: Take
action if >50 mites Powdered sugar roll: Take action if > 10
mites
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Treatment Thresholds in Winter/Spring
Late Winter Sampling (early to mid-March) 24 hour natural fall on sticky board: Take action if
>2 mites
Spring Sampling (late March to mid-June) 24 hour natural fall on sticky board: Take action if
>10 mites Powdered sugar roll: Take action if >3 mites
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Understanding Varroa Population Dynamics
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IF YOUR BEES NEED TREATMENT, GET IT ON
BEFORE THE END OF AUGUST!
Unless you’d rather have dead bees….
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It bears repeating….
Don’t be a mutt! Treat your bees before August 31 or you won’t have bees next spring!
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If testing indicates mite levels below treatment threshold,DON’T TREAT!
(Unless you like to throw away money….)
Hives that don’t need treatment can be supered for a fall crop….
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And for the rest of the story…..
Including: Cultural controls for Varroa: drone culling,
comb replacement, reproductive interruption
Less toxic controls: essential oils, organic acids, mineral oil, fumigation techniques
And the “hard stuff” - coumaphos and fluvalinate
You won’t have to force it out of me….
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I’ll tell everything I know on June 12! At the Varroa
Workshop Right here at the
Essex County Environmental Center
6:30pm Tuesday June 12
See you then!