As of June 29, we have tested a total of 687 corn earworm moths in our pyrethroid resistance monitoring program and the results are rather foreboding. If you open the attached PowerPoint graph you will see the data from 2010 and 2011, to date. We are seeing levels of survivors reaching 40%–not good for this early in the season. Of course things could change as we move into the season. But recent history has shown that once survivorship reaches these levels, although there will be some ups-and-downs, the overall levels will stay pretty high. The areas of the state where conditions remain dry will be at the greatest risk to intensive moth flights and the potential for less-than-satisfactory levels of control with pyrethroid insecticides.
Additional information: cew-avt-data-jun-29-2011-herbert-pptx