VegNet Regional Pest Trends for the Week of July 18th, 2016

VegNet is an insect pest monitoring program funded by the Oregon Processed Vegetable Commission and managed by the Oregon State University Department of Horticulture. To add your name to this newsletter, please click the ‘subscribe’ button on the homepage. For a review on how to interpret VegNet tables, click here.

  • Loyal VegNet followers will recall that there has been a steady increase in Black Cutworm (Agrotis ipsilon - BCW) activity since 2012. We are detecting male moths earlier each year, and activity varies throughout the season, with multiple peaks (FIG. 1). BCW in 2016 has been variable. BCW is most damaging to seedlings, but it is important to note that larvae attack a wide variety of host plants.

  • Although the regional average of Corn Earworm (Helicoverpa zea - CEW) does not seem too much different than the historical norm, we have flagged it because it is elevated, and more importantly, early. We have added a second Albany site to better monitor CEW activity. Keep a watchful eye as corn begins to silk, as that is the preferred site for egg-laying.
  • With grass seed harvest complete, it is expected that 12-spot beetles (Diabrotica undecimpunctata u. – 12S) will be moving into vegetables. Populations are much higher than normal, which could mean that this ‘common’ pest exhibits uncommon feeding on crops, weeds, etc.