For the Week of September 19
We will be hosting a pear psylla field day on September 21st from 10:00 a.m. – 12:00 p.m. The goal of the field day is to discuss the outcomes of the first year of the phenology program and compare conventional and phenology-managed orchards. The event will count for 2 pesticide credits.
Visit EventBrite to register (it’s free!) and get all of the details.
Pear psylla degree-days:
- Current PDD (9/16): 4340 Wenatchee, 4014 Cashmere, 3560 Peshastin
- Projected PDD (9/23): 4476 Wenatchee, 4150 Cashmere, 3680 Peshastin
Current guidelines (3500 PDD):
Honeydew washing is the best tactic around harvest. If desired, use a short-PHI organic product following a wash, but be careful not to mark fruit. Visit location-specific links below for more management guidelines:
How is the phenology-based program doing?
This was a tough year for pear psylla throughout the valley, but the phenology-based IPM program worked as expected relative to conventional orchards. In 4 out of 8 phenology program sites, biocontrol has resulted in less pear psylla at harvest time. In the other 4 phenology sites, where biocontrol was more limited, outcomes currently similar to the conventional paired sites. Overall, the phenology-based program was similar or better to conventional. We will be collecting spray records later to assess costs. In future years on the project, we will be able to see if biocontrol improves at sites where it was limited this year and stays consistent at others.
Site specific graphs of psylla abundance are posted on the project webpage if you would like to see the data for your orchards.
Summer Sampling (May 30 through present)
Figure 2. Summer (starting 30 May) summary of pear psylla adults, eggs, and nymphs across 8 conventional, 8 phenology-based IPM, and 3 organic pear orchards. Psylla art by Toriani Kent.