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, but black cutworm numbers are low (10/trap/week this past week). Counts of bertha armyworm have been near zero 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 or The Weather Channel for the latest forecasts.

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

Individual Pest Model Predictions (selected)

Western cherry fruit fly - BIOFIX March 1
**** revised 7-2-98 ****
Willamette Valley - First emergence was predicted May 31, first eggs on fruit was predicted June 7, first hatch was predicted June 12, peak egglaying was predicted June 21, 100% adult emergence was predicted June 26, and first pupation predicted on July 1.
The Dalles (warmest locations) - First emergence was predicted May 6, first eggs on fruit May 13, first hatch May 19, peak egglaying May 28, 100% emergence June 1, and first pupation predicted on June 5
Hood River (lower valley) - First emergence was predicted on May 28, first eggs June 4, and first hatch June 9, peak egglaying June 17, 100% adult emergence June 21, and first pupation was predicted on June 26.

Codling moth
**** revised 7-2-98 ****
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 predicted on July 8, and second generation 5% adult emergence predicted on July 17.
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 predicted on July 11, 95% egg hatch predicted on July 23, and second generation 5% adult emergence predicted on August 4.
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, and 95% egg hatch predicted on July 12, and next generation 5% adult emergence predicted on July 24.

Pandemis leafroller
note: this is a new implementation of the Brunner model, using a default BIOFIX of March 1
**** revised 7-2-98 ****
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 27

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, and 95% moth emergence predicted July 8

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 predicted June 29

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 7-2-98 ****
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 16
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, and peak egg hatch predicted July 13
Corvallis - 5% moth catch in pheromone traps was predicted June 12, first egglaying June 21, peak egg laying and 80% catch in pheromone traps predicted July 8, and peak egg hatch predicted July 21

Orange tortrix
**** revised 7-2-98 ****
Forest Grove - Peak egglaying predicted May 8, peak egg hatch predicted May 30, peak density of large larvae predicted July 6

McMinnville - Peak egglaying predicted May 11, peak egg hatch predicted June 1, and peak density of large larvae predicted July 10

Corvallis - Peak egglaying predicted May 17, peak egg hatch predicted June 6, peak density of large larvae predicted July 15

Strawberry root weevil
**** revised 7-2-98 ****
Corvallis - Currently adults beginning to lay eggs, peak adult emergence predicted June 19, peak egglaying predicted July 7
Madras - Currently adults emerging, peak adult emergence predicted June 29, peak egglaying predicted July 13

European pine shoot moth
**** revised 7-2-98 ****
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 7-2-98 ****
**** 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 predicted July 9, and first second stage nymphs predicted July 14

Salem - First crawlers were predicted on June 11, average time of crawler treatment predicted July 4, first second nymphs predicted July 9

On-line since April 5, 1996
Last updated July 1, 1998
Contact Len Coop at coopl@bcc.orst.edu if you have any questions about this information.