It’s part 2 of our dive into the Insect Apocalypse, with our good friend Dr. Jason Dombroskie from the Cornell University Insect Collection! In this part, Jason fills us in on the drivers of the Insect Apocalypse and - most importantly - what we can do about it. This episode was recorded on August 21, 2025 at Rattlesnake Hill Wildlife Management Area in Dalton, NY.. Episode Notes During the episode, we made the claim that 40 million acres of the US is lawn, and that that area is equal to all of the country’s National Parks put together. True? Well, sort of. The claim that the U.S. has about 40 million acres of lawn—roughly equal to all our national parks combined—is only partly true. A NASA-funded study led by Cristina Milesi estimated that turfgrass covers about 128,000 km² (≈31 million acres) of the continental U.S., making it the largest irrigated “crop” in the country (Milesi et al., Environmental Management, 2005; NASA Earth Observatory). Later analyses and popular summaries often round that up to ≈40 million acres (e.g., Scienceline, 2011; LawnStarter, 2023). By comparison, the total land area of all officially designated U.S. National Parks is about 52.4 million acres, while the entire National Park System—which also includes monuments, preserves, and historic sites—covers about 85 million acres (National Park Service, 2024). So while lawns and parks occupy areas of similar magnitude, lawns do not actually equal or exceed the combined area of the national parks. Is it better to mulch leaves on your lawn or leave them be? Here’s what we found: It’s generally best to mulch your leaves with a mower rather than rake or remove them. Research from Michigan State University found that mowing leaves into small pieces allows them to decompose quickly, returning nutrients to the soil and reducing weeds like dandelions and crabgrass (MSU Extension, “Don’t rake leaves — mulch them into your lawn”, 2012). Cornell University studies similarly show that mulched leaves improve soil structure, moisture retention, and microbial activity (Cornell Cooperative Extension, “Leaf Mulching: A Sustainable Alternative”, 2019). However, in garden beds, wooded edges, or under shrubs, it’s often better to leave leaves whole, since they provide winter habitat for butterflies, bees, and other invertebrates that overwinter in leaf litter (National Wildlife Federation, “Leave the Leaves for Wildlife”, 2020). The ideal approach is a mix: mow-mulch leaves on grassy areas for turf health and leave them intact where they naturally fall to support biodiversity and soil ecology. Episode Links The Cornell University Insect Collection Also, check out their great Instagram feed And their annual October event Insectapalooza Find out more about the recently discovered species of Swallowtail, Papilio solstitius, commonly known as the Midsummer Tiger Swallowtail- https://www.sci.news/biology/papilio-solstitius-13710.html Sponsors and Ways to Support Us Thank you to Always Wandering Art (Website and Etsy Shop) for providing the artwork for many of our episodes. Support us on Patreon. Works Cited Biesmeijer, J.C., Roberts, S.P., Reemer, M., Ohlemuller, R., Edwards, M., Peeters, T., Schaffers, A.P., Potts, S.G., Kleukers, R.J.M.C., Thomas, C.D. and Settele, J., 2006. Parallel declines in pollinators and insect-pollinated plants in Britain and the Netherlands. Science, 313(5785), pp.351-354. Boyle, M.J., Bonebrake, T.C., Dias da Silva, K., Dongmo, M.A., Machado França, F., Gregory, N., Kitching, R.L., Ledger, M.J., Lewis, O.T., Sharp, A.C. and Stork, N.E., 2025. Causes and consequences of insect decline in tropical forests. Nature Reviews Biodiversity, pp.1-17. Burghardt, K.T., Tallamy, D.W., Philips, C. and Shropshire, K.J., 2010. Non‐native plants reduce abundance, richness, and host specialization in lepidopteran communities. Ecosphere, 1(5), pp.1-22. Colla, S.R. and Packer, L., 2008. Evidence for decline in eastern North American bumblebees (Hymenoptera: Apidae), with special focus on Bombus affinis Cresson. Biodiversity and Conservation, 17(6), pp.1379-1391. Crossley, M.S., Meier, A.R., Baldwin, E.M., Berry, L.L., Crenshaw, L.C., Hartman, G.L., Lagos-Kutz, D., Nichols, D.H., Patel, K., Varriano, S. and Snyder, W.E., 2020. No net insect abundance and diversity declines across US Long Term Ecological Research sites. Nature Ecology & Evolution, 4(10), pp.1368-1376. DeWalt, R.E., Favret, C. and Webb, D.W., 2005. Just how imperiled are aquatic insects? A case study of stoneflies (Plecoptera) in Illinois. Annals of the Entomological Society of America, 98(6), pp.941-950. Edwards, C.B., Zipkin, E.F., Henry, E.H., Haddad, N.M., Forister, M.L., Burls, K.J., Campbell, S.P., Crone, E.E., Diffendorfer, J., Douglas, M.R. and Drum, R.G., 2025. Rapid butterfly declines across the United States during the 21st century. Science, 387(6738), pp.1090-1094. Gaona, F.P., Iñiguez-Armijos, C., Brehm, G., Fiedler, K. and Espinosa, C.I., 2021. Drastic loss of insects (Lepidoptera: Geometridae) in urban landscapes in a tropical biodiversity hotspot. Journal of Insect Conservation, 25(3), pp.395-405. Gardiner, M.M., Allee, L.L., Brown, P.M., Losey, J.E., Roy, H.E. and Smyth, R.R., 2012. Lessons from lady beetles: accuracy of monitoring data from US and UK citizen‐science programs. Frontiers in Ecology and the Environment, 10(9), pp.471-476. Groenendijk, D. and van der Meulen, J., 2004. Conservation of moths in The Netherlands: population trends, distribution patterns and monitoring techniques of day-flying moths. Journal of Insect Conservation, 8(2), pp.109-118. Haddad, N.M., Haarstad, J. and Tilman, D., 2000. The effects of long-term nitrogen loading on grassland insect communities. Oecologia, 124(1), pp.73-84. Hallmann, C.A., Sorg, M., Jongejans, E., Siepel, H., Hofland, N., Schwan, H., Stenmans, W., Müller, A., Sumser, H., Hörren, T. and Goulson, D., 2017. More than 75 percent decline over 27 years in total flying insect biomass in protected areas. PLoS ONE12 (10): e0185809 Hallmann, C.A., Ssymank, A., Sorg, M., de Kroon, H. and Jongejans, E., 2021. Insect biomass decline scaled to species diversity: General patterns derived from a hoverfly community. Proceedings of the National Academy of Sciences, 118(2), p.e2002554117. Harris, J.E., Rodenhouse, N.L. and Holmes, R.T., 2019. Decline in beetle abundance and diversity in an intact temperate forest linked to climate warming. Biological Conservation, 240, p.108219. Hembry, D.H., 2013. Herbarium Specimens Reveal Putative Insect Extinction on the Deforested Island of Mangareva (Gambier Archipelago, French Polynesia). Pacific Science, 67(4), pp.553-560. Høye, T.T., Loboda, S., Koltz, A.M., Gillespie, M.A., Bowden, J.J. and Schmidt, N.M., 2021. Nonlinear trends in abundance and diversity and complex responses to climate change in Arctic arthropods. Proceedings of the National Academy of Sciences, 118(2), p.e2002557117. Huryn, A.D. and Wallace, J.B., 2000. Life history and production of stream insects. Annual review of entomology, 45(1), pp.83-110. Kawahara, A.Y., Reeves, L.E., Barber, J.R. and Black, S.H., 2021. Eight simple actions that individuals can take to save insects from global declines. Proceedings of the National Academy of Sciences, 118(2), p.e2002547117. Leuenberger, W., Doser, J.W., Belitz, M.W., Ries, L., Haddad, N.M., Thogmartin, W.E. and Zipkin, E.F., 2025. Three decades of declines restructure butterfly communities in the Midwestern United States. Proceedings of the National Academy of Sciences, 122(33), p.e2501340122. Liang, M., Yang, Q., Chase, J.M., Isbell, F., Loreau, M., Schmid, B., Seabloom, E.W., Tilman, D. and Wang, S., 2025. Unifying spatial scaling laws of biodiversity and ecosystem stability. Science, 387(6740), p.eadl2373. Lister, B.C. and Garcia, A., 2018. Climate-driven declines in arthropod abundance restructure a rainforest food web. Proceedings of the National Academy of Sciences, 115(44), pp.E10397-E10406. Owens, A.C., Pocock, M.J. and Seymoure, B.M., 2024. Current evidence in support of insect-friendly lighting practices. Current Opinion in Insect Science, 66, p.101276. Myers, L.W., Kondratieff, B.C., Grubbs, S.A., Pett, L.A., DeWalt, R.E., Mihuc, T.B. and Hart, L.V., 2025. Distributional and species richness patterns of the stoneflies (Insecta, Plecoptera) in New York State. Biodiversity Data Journal, 13, p.e158952. Pilotto, F., Kühn, I., Adrian, R., Alber, R., Alignier, A., Andrews, C., Bäck, J., Barbaro, L., Beaumont, D., Beenaerts, N. and Benham, S., 2020. Meta-analysis of multidecadal biodiversity trends in Europe. Nature communications, 11(1), p.3486. Pinkert, S., Farwig, N., Kawahara, A.Y. and Jetz, W., 2025. Global hotspots of butterfly diversity are threatened in a warming world. Nature Ecology & Evolution, pp.1-12. Raven, P.H. and Wagner, D.L., 2021. Agricultural intensification and climate change are rapidly decreasing insect biodiversity. Proceedings of the National Academy of Sciences, 118(2), p.e2002548117. Rodrigues, A.V., Rissanen, T., Jones, M.M., Huikkonen, I.M., Huitu, O., Korpimäki, E., Kuussaari, M., Lehikoinen, A., Lindén, A., Pietiäinen, H. and Pöyry, J., 2025. Cross‐Taxa Analysis of Long‐Term Data Reveals a Positive Biodiversity‐Stability Relationship With Taxon‐Specific Mechanistic Underpinning. Ecology Letters, 28(4), p.e70003. Salcido, D.M., Forister, M.L., Garcia Lopez, H. and Dyer, L.A., 2020. Loss of dominant caterpillar genera in a protected tropical forest. Scientific reports, 10(1), p.422. Sánchez-Bayo, F. and Wyckhuys, K.A., 2019. Worldwide decline of the entomofauna: A review of its drivers. Biological conservation, 232, pp.8-27. Schowalter, T.D., Pandey, M., Presley, S.J., Willig, M.R. and Zimmerman, J.K., 2021. Arthropods are not declining but are responsive to disturbance in the Luquillo Experi
