By Pam Smith
Originally published in Farm Journal in August, 2011
Rootworms are rascals. The latest evidence of this comes in the first documented case of resistance by a field population of western corn rootworm in northeastern Iowa.
An Iowa State University team led by Aaron Gassmann responded to producer concerns that Bt hybrids expressing the Cry3Bb1 protein were exhibiting significant larval damage. Gassmann’s report in the PLoS ONE scientific journal reveals how he collected western corn rootworm adults from those fields and found that the progeny from those parents able to survive on Bt corn hybrids expressing the Cry3Bb1 toxin at levels higher than western corn rootworm from fields not exhibiting significant larval damage.
For more information: http://www.agweb.com/article/crop_tech_rootworms_grow_up_resistant/