Temperatures continued "normal" in W. Oregon, cool in S & E Oregon
In W. Oregon, since about May 31, temperatures have been almost exactly normal, ending the cool wet weather during the last 3 weeks of May. We are now pretty much "back on track" with pest developments. In Central Oregon (Madras), it has not "caught up" with historical average degree-day accumulations. In fact, using a 41F lower threshold, most of Central and all of far East and Southeast Oregon are "behind" by 30-200+ degree-days, making this a very cool year so far in those regions.

In the Willamette valley, so far, cabbage loopers are being trapped in moderately high numbers, black cutworm numbers have increased and leveled off since around July 6, now averaging 10/trap/week this past week. Counts of bertha armyworm have been zero since early June, and corn earworm has been zero so far. Send in any reports from other regions and crops of pest developments to me at coopl@bcc.orst.edu. Check the Oregon Climate Service, The Weather Channel, or your favorite weather data source for the latest forecasts.

Cumulative Degree-Day comparisons created using JAVA degree-day calculator

Individual Pest Model Predictions (selected)

Codling moth
**** revised 7-13-98 ****
Medford - BIOFIX Apr 21; 3% egg hatch was predicted June 1; 20% egg hatch June 9; 50% egg hatch June 19, 75% egg hatch June 28, 95% egg hatch July 8, second generation 5% adult emergence predicted on July 17, and second generation 7% egg hatch predicted on July 28.
Corvallis/Eugene - BIOFIX Apr 30; 3% egg hatch was predicted June 9; 20% egg hatch June 21, 50% egg hatch July 2, 75% egg hatch July 10, 95% egg hatch predicted on July 22, and second generation 5% adult emergence predicted on August 3.
Hood River (lower valley) - BIOFIX Apr 24; 3% egg hatch predicted on May 31; 20% egg hatch June 9, 50% egg hatch June 20, 75% egg hatch June 29, 95% egg hatch July 10, next generation 5% adult emergence predicted on July 22, and second generation 7% egg hatch predicted on August 6.

Pandemis leafroller
note: this is a new implementation of the Brunner model, using a default BIOFIX of March 1
**** revised 7-13-98 ****
Hood River (lower valley) - first moth catch in pheromone traps was predicted May 31, first egg hatch June 17, 50% egg hatch June 20, 95% moth emergence June 24, and first moth catch (2nd flight) predicted July 26

Parkdale (upper Hood River valley) - first moth catch in pheromone traps was predicted June 12, first egg hatch July 1, 50% egg hatch July 4, 95% moth emergence July 8, and first moth catch (2nd flight) predicted August 10

Corvallis - first moth catch in pheromone traps was predicted June 2, first egg hatch June 21, 50% egg hatch June 24, and 95% moth emergence June 29, and first moth catch (2nd flight) predicted August 1

Medford - first moth catch in pheromone traps was predicted June 1, first egg hatch June 17, 50% egg hatch June 20, 95% moth emergence June 23, and first moth catch (2nd flight) predicted July 22

Obliquebanded leafroller
note: this is the Hazelnut version of the model -
has not tested in pears and does not require a BIOFIX (default of March 1 always used)
**** revised 7-13-98 ****
McMinnville - 5% moth catch in pheromone traps was predicted June 7, first egglaying June 14, peak egg laying July 2, and peak egg hatch predicted July 15
Hood River - 5% moth catch in pheromone traps was predicted June 7, first egglaying June 13, 50% catch in pheromone traps June 23, and peak egg laying and 80% catch in pheromone traps June 29, peak egg hatch July 12, and peak small larvae predicted July 26
Corvallis - 5% moth catch in pheromone traps was predicted June 12, first egglaying June 21, peak egg laying and 80% catch in pheromone traps July 7, peak egg hatch predicted July 20, and peak small larvae predicted August 6

Filbertworm
**** 7-15-98 ****
McMinnville - first moth emergence was predicted July 6, average first moth emergence July 8, first eggs predicted July 20, first egg hatch predicted July 29
Forest Grove - first moth emergence was predicted July 1, average first moth emergence July 4, first eggs predicted July 17, first egg hatch predicted July 24
Corvallis - first moth emergence was predicted July 11, average first moth emergence July 14, first eggs predicted July 26, first egg hatch predicted Aug. 3

Strawberry root weevil
**** revised 7-13-98 ****
Corvallis - Currently adults continuing to lay eggs, peak adult emergence June 19, peak egglaying July 7, and peak egg hatch predicted July 7
Madras - Currently adults at peak egglaying, peak adult emergence June 29, peak egglaying predicted July 12, and peak egg hatch predicted July 25

European pine shoot moth
**** revised 7-13-98 ****
McMinnville - First moth catch in pheromone traps was predicted May 29, 50% catch predicted June 14, 75% catch June 23, and 90% moth catch was predicted June 28
Corvallis - First moth catch in pheromone traps was predicted May 30, 50% catch June 16, 75% catch June 26, and 90% moth catch was predicted June 30

San Jose scale
**** revised 7-13-98 ****
**** note: the default BIOFIX of March 15 was confirmed as adequate for the Northern Willamette valley ****
Corvallis - First crawlers are normally expected the first week in June, this year predicted on June 15, average time of crawler treatment July 8, first second stage nymphs July 14, and first pupae predicted July 27

Salem - First crawlers were predicted on June 11, average time of crawler treatment predicted July 4, first second nymphs predicted July 8, and first pupae predicted July 23

On-line since April 5, 1996
Last updated July 13, 1998
Contact Len Coop at coopl@bcc.orst.edu if you have any questions about this information.