VegNet Regional Pest Trends for the Week of August 8th, 2016

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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.