VegNet Regional Pest Trends for the Week of August 17th, 2015
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
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For a review on how to interpret VegNet tables, click here.
Corn Earworm (Helicoverpa Zea - CEW) is higher than
historical norms but has, over the past 2 weeks, dropped below the level
of the outbreak of 2008 (FIG. 1). The pattern appears to be shifted,
with peak flight occurring about 2 weeks earlier
than the 15-yr average. The trend may be a consequence of a mild winter,
earlier corn plantings, and/or warmer temperatures (FIG. 2). The
highest activity we’ve seen has been localized around a few geographical
locations. Please note: trap counts are not a
direct estimate of larval activity, so field scouting is recommended if
there is concern. More information on CEW can be found on the VegNet
pest profile page.
Other pests that were detected at higher-than-normal levels this week are: Black Cutworm (BCW), Spotted Cucumber Beetle (12S), and Alfalfa Looper (AL)
– Corn earworm activity of adult male moths so far this year (2015)
compared to historical data (2008 and the 15-year average). There are
1-3 overlapping generations of CEW per season.
– Differences between growing degree-days and precipitation from year
to year can be estimated by an online modeling program hosted at www.uspest.org/wea.
According to a generalized model for pest insects (lower threshold 41,
upper 130), degree-day accumulation this year for the Corvallis region
is about 13 days ahead of 2014.
Some late strawberries and raspberries, but not many left. Blueberries - major picking done. Some still available. Blackberries - still picking, good crop, small berries due to lack of rain and moisture.
Early apples - picking. Need some cooler evening temps for good ripening. Peaches - some still available. Asian pears - picking. Bartlett pears - any day now. The green skin color is turning yellow.
Lots of veggies available.
Skinner Butte, Eugene - 300 brown mormorated stink bugs collect in an hour. BMSB populations are building in the south valley.
Early apples - being picked. Plum/prunes - turning purple. Peaches - continue to be picked. Not a lot of spotted wing drosophila reports in the lower valley this year, so far. Mid season apples - coloring with warm days and cooler nights. Blackberries - smaller size due to the very warm weather. Walnut husk fly - SHOULD be out but no reports
of it being out yet.
Filbertworm - heavy emergence during the recent
hot weather. Red flame grapes - turning color, but smaller in size,
even with watering.