Monday, June 29, 2015

Spotted cucumber beetles - out in lage numbers

VegNet Regional Pest Trends for the Week of June 22nd, 2015

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.
  • Counts of Spotted Cucumber Beetle (Diabrotica undecimpunctata M. – 12S) on sticky traps are much higher than normal for this time of year (see FIG.1). As grass fields dry down and are cut, 12S often invade the surrounding landscape, which can influence sticky trap counts. Sweep net sampling is recommended to determine actual 12S pressure within snap bean fields. See last week’s report for more information about the 12S beetle.
  • Although some areas had elevated numbers of Diamondback Moth (Plutella xylostella L. – DBM) this week, the valley-wide average is comparable to historical norms. DBM action thresholds vary depending on the vegetative stage of the crop; new transplants are at greater risk for injury than older plants, but the risk increases again at button stage due to potential for contamination by pupae. More information on DBM biology and risk assessment can be found on the VegNet pest profile page.
FIG. 1 – Spotted cucumber beetle activity is very elevated this week. A mild winter combined with high temperatures over the past few weeks could be to blame. Close proximity to neighboring grass fields can affect detection levels as well. This graph shows trap counts so far this year compared to 2009, and to a 10-year average (1999-2009).

No comments:

Post a Comment