chemical free beekeeping? extension/research apiculturist department biochemistry, molecular...
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Chemical Free Beekeeping?
Extension/Research ApiculturistDepartment Biochemistry, Molecular Biology, Entomology & Plant Pathology
Mississippi State University, MS 39762
Jeff Harris
Mississippi Agricultural & Forestry Experiment Station
Varroa destructor Anderson & Trueman
2
1
8
3
4
5
6
7
9
Damage to Bees: Viruses!!!
Parasitic Mite Syndrome(the end is near)
Regimented Chemical Use
(apply chemicals routinely in spring and late summer)
Advantages
• No thinking just doing (assembly line)
• Can be effective early in a pest control program
• Saves labor costs often associated with non-chemical means
Chemicals in bee coloniesmay lead to:
contaminated wax and honey
mites that are resistant to chemicals
harmful effects to bees
Chemical Control of Varroa
• 1st legal varroacide; 1987 from Mavrik®
• 1990 as Apistan®; 0.7 g active ingredient per strip
• 10% moves into hive components over 8 weeks
• pyrethroids poison Na+ channels of nerves tau-fluvalinate
tau-fluvalinate
• Varroa mites resistant to chemical by 1995
• Health effects on honey bees– Smaller queens– Low survival of drones– Low body weight of drones– Reduced sperm counts from drones
• 5 year half-life for residues in hives
Table 3 – Commonly Used Legal Formulations to Control Varroa Mites
Product Active
Ingredient Mode of Action Formulation
Health Effects on Bees
Residue Time in Combs
Apistan tau-fluvalinate poisons voltage-gated sodium ion channels in nerves
impregnated strips
yes years
CheckMite+ coumaphos poisons the enzyme acetyl-cholinesterase in nerves
impregnated strips
yes years
Apivar amitraz binds to octopamine receptors in nerves
impregnated strips
yes short
ApiLife Var thymol binds octopamine and GABA receptors in nerves
solid wafer yes short
Mite Away II formic acid a strong acid that disrupts electron transport in mitochondria of cells
soaked onto pads that
release fumes
yes short
The darling of our indust
ry
Whatcha
gonna do?
Insecticide Treadmill
Never Use Chemicals
(let my bees survive without the use of drugs)
Cultural & Physical Methods• Increase distance between colonies in apiary
• Increase distance between apiaries
• Place colonies in irregular groups and not rows
• Paint hives different colors
• Don’t put sick and dying colonies onto stronger ones
• Drone Trapping
• Use Varroa-resistant bee stock
Advantages
• My honey and wax are more likely to be free of harmful chemicals
• My bees will not suffer from toxic effects of insecticides
Disadvantages
• Bee colonies will die from varroa mites
• Most small scale beekeepers cannot control breeding of their bees
• If a small scale beekeeper is isolated, the risks of inbreeding are high
Have you got your
Plan B all
worked out?
Any change is “impossible”…
until you start doing it.
Sugar Shake
• 300 worker bees from brood-nest
• 1 fluid oz. = 100 bees
• 2 Tablespoons of powdered sugar
• Coat the bees, wait 3-5 minutes, shake out sugar and mites
Alcohol Wash (70% ethanol)(alternative : 15-30 drops liquid dish detergent per pint of water)
5% threshold for late summer means:
that you found 5 mites for every 100 adult bees sampled
Table 2 – Number of Colonies to Sample for Apiary-Level Treatment Decisions
No. Colonies
in Apiary
No.
Sampled
>20 8
20 6
10 5
4 3
• Colonies should be spread throughout apiary
• Use average mite load to decide if whole apiary is treated
Position of Drone Frames
Brood Nest
(view from top)
W H HWH H W D W D
ARS Russian Honey Bees
• from far-eastern Russia• believed to have longest exposure to Varroa mites• selectively bred at Baton Rouge lab• good varroa resistance• good tracheal mite resistance• good overwintering
Varroa Sensitive Hygiene
Minnesota Hygienic Bees
sample (1%)
Jan Feb Mar April May June July Aug Sept Oct Nov Dec
sample (5-10%)
Apistan, Apivar, etc. Thymol, Formic Acid, etc.
Honey Production
Winter Bee Production
Did treatment work?
Varroa IPM Summary
• Sample in February and again in August/September
• Treat with chemicals only when mite populations exceed thresholds
• Use a resistant stock
• Use drone comb as traps
• Use screen floors
Gilles San Martin