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Pesticide Toxicology Laboratory

ISU Entomology / Pesticide Toxicology Laboratory / Effects of corn plants and corn pollen on monarch butterfly (Lepidoptera: Danaidae) oviposition behavior

Effects of corn plants and corn pollen on monarch butterfly (Lepidoptera: Danaidae) oviposition behavior

Authors: Tschenn, J., Losey, J.E., Jesse, L.H., Obrycki, J.J., Hufbauer, R.
Journal, Volume, Year: Environmental Entomology, volume 30(3):495-500, 2001
Summary

The effect of pollen deposition and corn plant proximity on oviposition behavior of monarchs (Danaus plexippus) was examined. In bench top studies there were no significant differences in oviposition preference for milkweed plants dusted with Bt 176 pollen, Bt free pollen, nothing, or gravel dust. In greenhouse studies using pollen from Bt 11, Mon 810, and their isolines, dusted on milkweed, monarchs oviposited significantly more eggs on the pollen free milkweed. There were no differences between the Bt or isoline pollen treatments. Monarchs also laid fewer eggs on milkweed that was surrounded with corn plants vs. milkweed only patches.

Comments

Indicates that monarchs would avoid milkweed with pollen, given a choice, therefore having less potential exposure to Bt in pollen.