T demonstrations by Losey et al. (1) and Hansen and Obrycki (www.ent. iastate.eduyentsocynch 99yprogyabsy D81.html) that milkweed leaves dusted with heavy concentrations of Bt corn pollen are toxic to Monarch butterfly larvae (Danaus plexippus) feeding on them were consistent with the known toxicity of Bt endotoxin to Lepidoptera in general and the expression of Bt endotoxins in the pollen of t...
