Author Archives: greenje
Data Report – August 13th
- .pdf report view/download including data table through August 10th
- A new cauliflower site has been established near Woodburn (WDBN)
- Detection of 4 bertha armyworms in the North Valley (STPL) is concerning. According to a degree-day model for the area, the scouting/treatment window is Aug 19th-26th. Smaller larvae are more susceptible to insecticides, but unfortunately armyworm ‘strikes’ are not evident until larger larvae mature and begin to move across the field.
- As sweet corn matures, corn earworm counts are expected to rise. The Northeastern IPM Center’s CEWIPM.org program offers many resources about best methods for trapping and predicting damage.
- Continued scouting for diamondback moth is recommended. Look for windowpaning damage and tapered, light green larvae thar wriggle backwards when disturbed. Populations can rapidly increase in warmer temperatures.
Data Report – July 31st
- Most trap counts are within normal range for late July, but remember, traps detect adult insects and damage is done by immature larvae.
- This means that now is a good time for field scouting. Specifically, look for diamondback moth larvae on the underside of brassica leaves.
- We have noted signs of 12-spot beetle feeding on developing snap bean pods. Sweep net sampling is recommended, with an estimated action threshold of 2 adults/sweep.
- Various armyworm species continue to be very abundant (true armyworm, glassy cutworm, etc.). Although these are not vegetable-specific pests, the high numbers of adults at many locations is worth mentioning.
Data Report – July 21st
The data table shows trap counts of adult insects from vegetable fields and a research farm within the Willamette Valley, OR. through July 21st, 2026. See the site code map for approximate locations.
Data Report – July 9th
- The data table shows trap counts of adult insects from vegetable fields and a research farm within the Willamette Valley, OR. through July 9th, 2026. See the site code map for approximate locations.
- Spotted cucumber beetles are increasing – cabbage looper counts vary by location – view the full report (.pdf below) for details.
- Our trap counts feed into a collaborative, multi-crop system called the Oregon Pest Monitoring Network. Their ‘pest forecast tool‘ provides interactive maps and tables to estimate impact based on pest phenology and existing degree day models.
Data Report – June 30th
2026 Site codes
Data Report – June 12th
- The table below shows trap counts from vegetable fields and a research farm within the Willamette Valley, OR. through June 11th, 2026.
- ** Black cutworm and corn earworm counts are both above normal – view full report (.pdf below) for details.
- Additional monitoring sites are being added – please contact me if you have brassica fields.
jessica.green[at]oregonstate[dot]edu
Data Report – August 14th
- Page 1 of the report below (see .pdf file) shows trap counts from monitored fields through August 6th. A map of the field sites is available.
- Page 2 of the report includes:
- a written summary of the data and
- a graph of cucumber beetle/southern corn rootworm (Diabrotica u. undecimpunctata) activity 2025 vs. 1999-2015.
Data Report – July 31st
- The table below shows trap counts from vegetable fields and a research farm within the Willamette Valley, OR. through July 23rd.
- A map of the field sites describes location codes.