Best Management Practices for Regionally-Distinct Populations of the Blue Orchard Bee

View the project final report

Commodities

• Fruits: cherries
• Nuts: almonds
• Animals: bees

Practices

• Crop Production: beekeeping
• Education and Training: extension, farmer to farmer, networking

Honey bees have become increasingly unavailable and expensive for crop pollination
since Colony Collapse Disorder was described and the world was alerted to CCD and the many
factors that negatively impact honey bee health. Although other managed pollinators, such as
bumble bees, alfalfa leafcutting bees, and blue orchard bees (BOBs), are available to pollinate
certain crops, a ready BOB supply and well-developed management system for their use are
especially lacking. BOB suppliers and managers need more information to supply customers
with disease- and pest-free bees, to manage bees for optimal performance for pollination, and to
maintain populations in numbers large enough for profitable business and to accommodate large
commercial operations. We seek to meet six objectives that tackle primary stakeholder concerns:
1) understanding variation in developmental phenology of regionally-distinct BOB populations;
2) finding the genetic basis for regional differences of BOB sources through crossbreeding/mating
experiments; 3) studies of population genetics; 4) examining pest and pathogen
communities of BOBs from distinct sources; 5) describing patterns and seeking causes of BOB
dispersal/loss in commercial settings; and 6) disseminating user-friendly information to the
general public. Field collections, orchard and laboratory behavioral studies, molecular
bioassays, and visual, x-radiographic, and microscopic diagnoses all will be employed to meet
the research objectives. Dissemination of information and development of public education
materials and events will be developed under consultation with Extension personnel in
Washington, Oregon, California, and Utah. Findings will reduce the need to trap BOBs from the
wild where the impact of trapping is yet unknown and, thus, will preserve local diversity of
native populations. Better bee management would provide a more reliable source of alternative
bees for pollination of suitable, pollinator-dependent crops. Understanding incidence of pests
and disease will reduce the chance of epidemic outbreaks in managed populations and possible
spillover to native bees. We will continuously educate the public and primary stakeholders,
while seeking valuable input from stakeholders as results unfold and new research approaches
are developed.

1. Determine the variation in developmental phenology of regional populations of BOBs by
maintaining regionally-specific bees under managed or unmanaged conditions. Year 2 JanuaryDecember;
Year 3 January-June.
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2. Determine the heritability of regional phenology traits for BOBs from California and Utah by
examining population crosses in controlled experiments. Year 2 January-December; Year 3
January-June.
3. Using population genetic tools, assess the extent of population genetic differentiation among
regions where BOBs are sourced and where they are deployed, detect the current structure of
populations, and understand the potential for future admixture. Year 1 September – Year 3 May.
4. Using visual or molecular examinations, identify parasites and pathogens obtained from
collections of bees from wild-trapped and managed populations, and use findings to infer how
BOB stocking density, co-pollination with honey bees, and other management strategies may
effect disease transmission within the pollination or mass propagation systems. Year 1 September
– Year 2 August.
5. Determine the difference in the retention of females between California and Utah BOBs used
as pollinators in regions outside of their geographic origin by examining the dispersal and flight
range of these populations in cherry orchards in regionally distinct environments. Year 2 MarchNovember.
6. Deliver high quality educational products and training on BOBs through extension and
outreach to maximize information sharing and adoption of new technologies. Year 2 October –
Year 3 December.