VegNet Regional Pest Trends for the Week of August 8th, 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.

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  • Corn Earworm (Helicoverpa zea - CEW) activity is on the decline, but knowing the average development time of CEW can help us predict pest pressure. For instance, eggs are laid 2 days after adults emerge, and larvae progress over the following 20 days (estimated). There was a peak flight of adults 2 weeks ago, which means earworms are likely now. The best protection is to apply chemical controls and/or mineral oil at silk.
  • CAUTION: a HEAT ADVISORY is in effect for this area from now through Saturday. As you know, development of insects depends on heat. For instance, Diamondback Moth (Plutella xylostella - DBM) populations can build up very rapidly. In fact, it takes just 10 days for DBM to complete an entire life cycle in high temperatures, versus the normal estimated 25-30 days. Although numbers of adults have been below average this year, use caution and increase field scouting for larvae, especially over the next few weeks.