Cover crops and baby carabids

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Presentation transcript:

Cover crops and baby carabids How does larval environment shape a beneficial insect community? Carmen Blubaugh, Cliff Sadof, and Ian Kaplan Purdue University Department of Entomology

Why carabids? Ubiquitous Diverse Vegetable pest predators Weed seed predators

Carabids weeds! Weed management is the greatest challenge to vegetable farmers in Indiana (Hilger 2006). Invertebrate seed predation is one of many components of an ecologically-based weed management strategy that may reduce hand labor. Much work has focused on in-field habitat management (e.g. cover crops) for epigeal natural enemies in agroecosystems, especially weed seed predators (reviewed in Landis et al 2005).

Larvae are important! Very little is known about them. Goal: That is, when they hatch, what they eat, where they live, etc. Goal: Learn basic biology of carabids in the larval state & evaluate how tillage regimes might help/harm them.

The Experiment: 4 fall cover crop treatments– 4 reps, randomized split design (tilled and planted in fall 2011) 2 tillage subplot treatments (nt & spring/fall till) Oriental mustard Rye Fallow Rye/vetch

Attempted data collection methods . . . . Soil core Excavation Quadrat sampling Litter bags Pitfall trap 

Larval activity calendar

Mean season-long larval activity per cover treatment

Total biomass (g) per cover treatment

Mean season-long adult activity per cover treatment

Mother knows best– clear oviposition preference for no-till habitats

Thanks! Ian Kaplan Clifford Sadof Kevin Gibson Doug Richmond Gina, Jess, Uli, Joe, Garvey, Elizabeth, and Gareth (!)

Amazing photo by Colin Hutton (www.colinhuttonphotography.com) Questions? Amazing photo by Colin Hutton (www.colinhuttonphotography.com)

Germination experiment Take II