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Pest Profile Photo Credit: Tom Murray, Bugguide.Net Pest Profile Photo credit: Tom Murray, Bugguide.net Common Name: Mexican Bean Beetle Scientific Name: Epilachna varivestis Order and Family: Coleoptera: Coccinellidae Size and Appearance: Length (mm) Appearance Egg -Bright yellow in color -Laid on-end in clusters of 40-60 on the lower leaf surfaces Larva/Nymph -Yellow or orange-yellow in color -6 rows of black branched spines 1-9mm Adult -Oval shaped and slightly larger than other ladybeetles 6-9mm -Dark yellow to copper to reddish brown in color depending on the season -8 spots on each wing arranged in a 3-3-2 pattern Pupa (if applicable -Yellow-orange - Similar to larva but lighter in color 6-9mm -Spiny larval skin pushed down to point of attachment to plant Type of feeder (Chewing, sucking, etc.): Chewing Host plant/s: The Mexican bean beetle can be found in gardens and bean fields on lima beans, snap beans, clover, and alfalfa. Occasionally the beetles will feed on soybeans and cowpeas. Description of Damage (larvae and adults): The Mexican bean beetle larvae and adults feed on the underside of the leaves between the veins, leaving behind a lacy skeleton appearance as the leaves die. The adult beetles will feed on the leaves until they become unappealing, then they will eat the blooms, stem, and green bean pods. References: Boone, M., Moisset, B., McLeon, R., Entz, C., Quinn, M., Moyer, T., & Kropiewnicki, T. (2004, November 23). Species Epilachna varivestis – Mexican Bean Beetle. Retrieved January 15, 2016, from http://bugguide.net/node/view/8712 Cranshaw, W. (2004). Garden insects of North America: The ultimate guide to backyard bugs. Princeton, NJ: Princeton University Press. Mexican Bean Beetle – Vegetables. (2016). Retrieved January 21, 2016, from http:extension.umd.edu/growit/insects/Mexican-bean-beetle Sanchez-Arroyo, H., Caster, J., Capinera, J., Wasik, D., & Medley, J., (1997, November). Mexican bean beetle – Epilachna varivestis Mulsant. Retrieved January 15, 2016, from http://entnemdept.ufl.edu/creatures/veg/bean/mexican_bean_beetle.htm .
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