Alfalfa's $8 Billion Problem

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. #LeafcutterBees #AlfalfaFarming #NativeBees #SecretPollinators #AgTwitter#FarmLife #SustainableAgriculture #AmericanFarmers #HorseOwners #SustainableAgriculture #EquineNutrition #HayForHorses #HorseFarm #SolitaryBees #PollinatorConservation #BeesOfInstagram #Alkalibee