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2022 Pear Pest Scouting

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Authors: Robert Orpet, Chris McCullough, and Louie Nottingham; WSU Entomology. March 14, 2022

The Nottingham lab at WSU-TFREC is monitoring pear pests at seven commercial locations in the Wenatchee Valley in addition to the WSU research center orchard (‘Sunrise’) near Rock Island (Figure 1). At each location, one block follows our phenology-based IPM guidelines and another block follows standard conventional management. We are also monitoring organically managed blocks at three of the locations. All blocks contain mostly Anjou and Bartlett trees planted >50 years ago, except for Rock Island, which was planted in 2007.

How we Sample

We sample pear psylla adults (Table 1) and natural enemies (Table 4) with beat tray taps. In spring, we collect buds to monitor eggs (Table 2) and nymphs (Table 3).  In summer through fall, we collect leaves to monitor eggs and nymphs.

Figure 1. Areas of paired pear orchards for pest monitoring in commercial orchards (panel A) and the WSU SRO pear blocks (panel B). AgWeatherNet (AWN) temperature sensor locations are indicated with blue points, city landmarks with red.

Psylla Adults Per Tray Tap

Table 1. Pear psylla adults per tray tap paired orchards (C = conventional, p = Phenology-based IPM, O = organic). Dates represent the week of the sample. Cells with “–” indicate no sample due to site inaccessibility or re-entry intervals.

PP adults/tray 3/9 3/16 3/21 3/28 4/4 4/11 4/18  4/25 5/2 5/9
TFREC no-spray 7.7 5.4 15 9.5 6 1.6 1.6 1.0 1.0
Rock Island 1 C 0.3 0.5 0.7 0.04 0 0 0.1 0.04 0
P 0.3 1.0 0.8 0.4 0.04 0.1 0.1 0.04 0.1
Monitor 2 C 19.0 18 28 10 2.3 0.1 0.1 0.04 0.2
P 19.1 14 5.5 9.2 0.2 0 0.1 0.2 0.3
Cashmere 3 C 16.8 18 18 1.8 1.0 0.2 0.1 0.1 0.2
P 22.2 17 29 1.4 0.3 0.3 0.2 0.2 0.4
O 3.4 0.4 0.4 0.3 0.8
Dryden 4 C 33.0 52 42 12 1.4 0.1 0.1 0 0.1
P 32.0 44 54 12 21 0.2 0.1 0.2 0.6
Dryden 5 C 21.0 42 52 19 5.0 0.6 1.2 0.9 2.5
P 11.0 42 50 19 5.8 0.5 0.2 0.04 0.2
O 2.8 0.4 0.6 0.2 0.4
Peshastin 6 C 30.0 56 23 9.1 5.4 0.6 0.8 0.2 0.7
P 13.0 49 32 9.6 5.2 0.8 0.7 0.4 0.9
O 3.4 0.8 1.0 0.4 0.6
Highway 97 7 C 39 46 13 1.3 3.0 2.2 4.3
P 31 32 6.4 1.0 0.8 1.8 3.0
Leavenworth 8 C 1.6 1.0 1.0
P 0.24 0 0.1
AVERAGE C 20 31 27 9  4.0  0.4 0.9 0.6 1.1
P 16 28 29 9  5.4  0.4 0.3 0.4 0.7

Eggs per Bud

Table 2. Pear psylla eggs per bud (green tissue and wood) paired orchards (C = conventional, P = phenology-based IPM, O = organic). Dates represent the week of the sample. Cells with “–” indicate no sample due to site inaccessibility or re-entry intervals.

PP eggs/bud 3/9 3/16 3/21 3/28 4/4 4/11 4/18 4/25 5/2 5/9
TFREC no spray 1.3 0.3 3.1 35 38 29 24.9 35.1 4.4 0
Rock Island 1 C 0.0 0.2 0.4 0.5 0.1 1 0.8 0.5 0 0
P 0.0 0.2 0.1 1.8 2.4 7 0 3.3 0.3 0
Monitor 2 C 0.5 8.4 18 21 29 19 16.2 20.4 3.3 0.9
P 1.0 9.2 14 6.9 13 11 4.4 27.8 2.3 2.5
Cashmere 3 C 0.3 4.3 5.0 15 13 15 6.2 17.4 1.5 0.2
P 0.9 7.6 16 19 6.4 7.5 5.1 3.6 3.8 3.8
O 25 28 27..8 31.0 12 1.2
Dryden 4 C 0.5 6.8 15 31 32 11 12.4 11.1 7.8 1.7
P 0.4 4.4 9.4 20 46 24 30.9 7.1 16 9.2
Dryden 5 C 0.7 5.8 7.6 28 62 32 29.4 35.3 9.7 9.4
P 0.4 5.9 12 33 44 24 18.7 32.0 10 7.8
O 8.3 5.6 10.7 7.0 7.3 0.4
Peshastin 6 C 0.7 8.0 23 25 26 24.1 12.6 13.4 11 1.8
P 0.4 4.6 16 16 17 4.0 15.1 24.4 20 3.8
O 29 4.0 7.4 4.6 6.4 0.4
Highway 97 7 C 10 64 120 130 55.9 86.1 74 7.9
P 2.8 25 25 20.9 50.0 9.5 35 4.5
Leavenworth 8 C 30.8 7.3 6.2
P 28.7 10 11
AVERAGE C 0.5 5.6 11 26  40 37.9 19 27 14 4.0
P 0.5 5.3 11 16  22 15.3 18 17 12 5.0

 

Table 3. Pear psylla nymphs per bud (green tissue and wood) paired orchards (C = conventional, P = phenology-based IPM, O = organic). Dates represent the week of the sample. Cells with “–” indicate no sample due to site inaccessibility or re-entry intervals.

PP nymphs/bud 3/9 3/16 3/21 3/28 4/4 4/11 4/18 4/25 5/2 5/9
TFREC no spray 0 0 0 0 0 0.2 0.1 2.5 24 23
Rock Island 1 C 0 0 0 0 0 0 0 0.1 0 0
P 0 0 0 0 0 0.04 0 0.1 1.4 0.8
Monitor 2 C 0 0 0 0 0.3 0.1 0.1 0.1 0.2 2.5
P 0 0 0 0 0 0.1 0 0 0.08 0.1
Cashmere 3 C 0 0 0 0 0.1 0.1 0 0 0.08 1.3
P 0 0 0 0 0.1 0.1 0 0.2 0.08 2.2
O 0 0.1 0 0.2 0.2 12
Dryden 4 C 0 0 0 0 0 0.1 0 0.2 0.1 1.0
P 0 0 0 0 0 0 0 0 0.1 0.6
Dryden 5 C 0 0 0 0 0 0.2 0.4 3.7 38 40
P 0 0 0 0 0 0.1 0.1 0.3 11 8.8
O 0 0.1 0 0.1 4.5 7.7
Peshastin 6 C 0 0 0 0 0 0 0.2 0.6 3.2 4.4
P 0 0 0 0 0 0 0.2 0.5 3.2 4.9
O 0 0 0 0.1 0.5 4.5
Highway 97 7 C 0 0 0 0 0 0.1 0.2 6.0 32 70
P 0 0 0 0 0 0.1 0.1 2.7 14 16
Leavenworth 8 C 0.8 15 21
P 0.1 5.4 1.2
AVERAGE C 0 0 0 0 0.1 0.07 0.1 1.4 11 18
P 0 0 0 0 0 0.08 0.06 0.5 4.4 4.3

Natural Enemies

Table 4. Total Deraeocoris per 25 trays at paired orchards (C = conventional, P = phenology-based IPM, O = organic). Dates represent the week of the sample. Cells with “–” indicate no sample due to site inaccessibility or re-entry intervals.

Deraeocoris 3/9 3/16 3/21 3/28 4/4 4/11 4/18 4/25 5/2 5/9
TFREC no spray 0 0 0 0 0 0 0 0 1
Rock Island 1 C 0 0 0 0 0 0 0 0 0
P 0 0 0 0 0 0 0 0 0
Monitor 2 C 0 0 1 0 0 0 0 0 1
P 0 0 0 1 0 0 0 0 0
Cashmere 3 C 0 1 0 0 0 0 0 0 0
P 0 0 1 0 1 0 0 1 2
O 0 0 0 1 0
Dryden 4 C 0 0 0 0 0 0 0 0 0
P 0 1 0 1 0 0 0 0 0
Dryden 5 C 0 0 0 0 0 0 0 0 0
P 0 0 0 0 0 0 0 0 0
O 0 0 0 0 0
Peshastin 6 C 0 1 0 0 0 0 0 0 0
P 0 0 0 0 0 0 1 0 0
O 0 0 1 0 1
Highway 97 7 C 0 0 0 1 1 1 0
P 0 0 0 0 0 1 4
Leavenworth 8 C 0 0 0
P 0 0 0
AVERAGE C 0 0.3 0.2 0 0 0 0.1 0.1 0.1
P 0 0.2 0.2 0.3 0.2 0 0.1 0.3 0.1

 

Contact Information

Robert Orpet

Dr. Robert Orpet
Postdoctoral Research Associate
WSU Tree Fruit Research & Extension Center
1100 N Western Ave., Wenatchee, WA 98801
robert.orpet@wsu.edu

Chris McCullough

Dr. Chris McCullough
Postdoctoral Research Associate
WSU Tree Fruit Research & Extension Center
1100 N Western Ave., Wenatchee, WA 98801
christopher.t.mccul@wsu.edu

Louie Nottingham

Dr. Louis Nottingham
Assistant Professor
WSU Tree Fruit Research & Extension Center
1100 N Western Ave., Wenatchee, WA 98801
louis.nottingham@wsu.edu
540-798-2044 (cell)

This Project was Funded by:

 

 

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