There's an eight billion dollar secret hiding in those purple alfalfa fields. It's not about the hay. It's not about the honeybees. It's about a tiny bee with a yellow belly and leaf-cutting jaws that makes American agriculture possible. This episode connects the dots from bee to bank account.

Crown Bees

Secret Pollinators

KEY SOURCES

Alfalfa leafcutting bee

• Pitts-Singer, T. L., & Cane, J. H. (2011). The alfalfa leafcutting bee, Megachile rotundata: the world's most intensively managed solitary bee. Annual Review of Entomology, 56, 221–237. DOI: 10.1146/annurev-ento-120709-144836 — accidentally introduced to the US by the 1940s; nest management transformed the North American alfalfa seed industry, tripling seed production; traits favoring commercialization include gregarious nesting, acceptance of mass-produced nesting materials, and emergence synchrony with alfalfa bloom.
• Richards, K. W. Alfalfa Leafcutting Bee, Megachile rotundata. In Encyclopedia of Entomology, Springer. — in western Canada, average alfalfa seed yield using this bee exceeds 300 kg/ha versus usually less than 50 kg/ha without it.
• Pitts-Singer, T. L., & Bosch, J. (2013). Intended release and actual retention of alfalfa leafcutting bees for pollination in commercial alfalfa seed fields. Journal of Economic Entomology, 106(2), 576–586. DOI: 10.1093/jee/106.2.576 — stocking densities of 15,000 / 30,000 / 45,000–50,000 bees per acre; only 46–79% of released bees survived incubation and field emergence.
• University of Florida IFAS, EENY-820, Alfalfa Leaf-Cutter Bee — used across over 70,000 hectares in North America; recognized to increase alfalfa seed production in the northwestern US and central Canada by about 50%.

Alkali bee

• Cane, J. H. (2024). The Extraordinary Alkali Bee, Nomia melanderi (Halictidae), the World's Only Intensively Managed Ground-Nesting Bee. Annual Review of Entomology, 69. DOI: 10.1146/annurev-ento-020623-013716
• Cane, J. H. (2008). A native ground-nesting bee (Nomia melanderi) sustainably managed to pollinate alfalfa across an intensively agricultural landscape. Apidologie, 39, 315–323. DOI: 10.1051/apido:2008013 — across a 240 km² Washington watershed, alkali bees multiplied nine-fold to 17 million females, the largest reported metapopulation of non-social bees; the most populous 1.5-ha bed reached 5.3 million nesting females.
• Cane, J. H. (2002). Pollinating bees of U.S. alfalfa compared for rates of pod and seed set. Journal of Economic Entomology, 95(1), 22–27.
• Washington State Magazine, Plan Bee (2018) — Touchet-Lowden-Gardena growers see roughly 50% higher alfalfa seed yields per acre; about 25% of the nation's alfalfa seed crop is grown there.

Tripping mechanism and honey bee behavior

• Free, J. B. (1993). Insect Pollination of Crops, 2nd ed. Academic Press.
• ATTRA / NCAT, Alternative Pollinators: Native Bees — honey bees learn to approach alfalfa flowers from behind to take nectar without triggering the stamen; alkali bees are undeterred by the mechanism.
• Mader, E., Spivak, M., & Evans, E. (2010). Managing Alternative Pollinators. SARE Handbook Series 11.

Wild bees and habitat on working lands

• Garibaldi, L. A., et al. (2013). Wild pollinators enhance fruit set of crops regardless of honey bee abundance. Science, 339(6127), 1608–1611. DOI: 10.1126/science.1230200
• Kremen, C., Williams, N. M., & Thorp, R. W. (2002). Crop pollination from native bees at risk from agricultural intensification. PNAS, 99(26), 16812–16816.
• Morandin, L. A., & Kremen, C. (2013). Hedgerow restoration promotes pollinator populations and exports native bees to adjacent fields. Ecological Applications, 23(4), 829–839.

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