Tree Fruit Research & Extension Center

Pest Management Transition Project

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Newsletter - Special Field Days Edition


WSU PMTP Field Days
Codling Moth and Leafroller
Secondary Pests
Sprayer Technology
Decision Aid System
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WSU Pest Management Transion Project Field Days

Tree fruit producers, pesticide applicators and field represen- tatives are encouraged to attend one of the pest management field days scheduled for the location and dates shown below. All field days will begin at 3:00 pm and end at 5:00 pm. Signs will be posted to direct you to the on farm meeting site. The field days will allow for

interactive discussions with WSU IPM experts on the topics of management programs for codling moth and leafroller, secondary pest issues, the Decision Aid System (DAS), and tree archi- tecture/sprayer technology. The field days are sponsored by PMTP, a joint project between WSU and the Washington State Tree Fruit

Industry. For more information and maps go to:

or email us: or call the WSU Tree Fruit Research and Extension Center at:

See you there!


  Quincy - Tuesday, June 10 - Morgan Orchards, 22532 Rd. 9 NW
  Prosser - Wednesday, June 11 - Oasis Farms, 73201 E Evans Rd.
 Brewster - Thursday, June 12 - Crane & Crane, Crane Warehouse Rd.



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Codling Moth and Leafroller

There are many new insecticides that are now available for the control of codling moth (CM) and leafroller (LR). The most successful use of these new products employs a strategic and programmatic approach that targets multiple life stages and, when possible, multiple pests. One strategy, that has proven to be successful, combines the use of codling moth mating disruption, a codling moth ovicide, and one or more codling moth larvicides.

Mating disruption reduces the number of eggs that are laid in the orchard, which can reduce the number of insecticide ap-plications that will be needed later. An insect growth reg-ulator (IGR) applied between 50-200DD can control feeding LR larvae as well as kill CM eggs that are laid on top of residues from the application, which will allow delaying the first larvicide application until 350DD. One or more larvicide

applications (or a tank-mix of an ovicide + larvicide) applied at 350DD, and repeated as necessary based on the length of residual control of the product used and pest pressure in the orchard, will provide control of first generation CM larvae. WSU researchers and growers who have used this strategy in their pest management programs will discuss their experiences at the PMTP field days.


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Secondary Pests

In some cases, the challenge of transitioning pest management programs away from the use of organophosphates has not been the control of direct pests, but rather the flare-ups of secondary pests that have come with the introduction of new insecticides into our orchard systems. Often times, the flare-up is difficult to trace back to one specific cause. Woolly apple aphid (WAA) is an example of a pest that stands out as increasing in importance as the use of organophosphates, such as Lorsban, have been reduced. New insecticides that are being used to control other insects also have the potential to disrupt biological control of this pest. Dr. Betsy Beers’ research program is currently working to identify reasons behind

Woolly Apple Aphid Colony

the increase in WAA. This, and other research will be discussed at the PMTP field days.


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Sprayer Technology

Thorough spray coverage is very important when using new insecticides that must be consumed by feeding larvae or come into direct contact with the egg. Horticultural practices, such as pruning and thinning, should aim to improve spray penetration and coverage in the tree canopy. Another important consideration is the type of sprayer being used. Some new sprayer types can achieve good coverage while traveling at faster speeds and using a lower volume of water than traditional airblast technologies. The fundamental theory of orchard spraying is to displace 100% of the clean orchard air with pesticide laden air. Sprayer fan capacity and tractor speed have a direct influence on air displacement. New sprayer technologies try to address the issue of air displacement, while incorporating the physics of droplets and wind to improve on the technology of airblast sprayers. Horticultural practices and spray technologies to improve pest management will be discussed at PMTP field days.

Orchard Tower Srayer


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Decision Aid System

The WSU Decision Aid System (DAS) is a web-based program that integrates weather data, insect and disease models, management recommendations, and pesticide recommendation databases. DAS is powered by data from WSU-AgWeatherNet and predicted weather from NOAA. DAS provides one stop shopping for time-sensitive IPM information. As pest management programs for CM and LR transition away from organophosphates to new insecticides, the use of monitoring programs has become more important for timing insecticide applications and sampling efforts and to help determine when insecticide input can be reduced or needs to be increased to manage insect pest populations.

Using computer models is an important aspect
of a sound monitoring program and DAS makes these models easier to use and more informative that ever before. DAS provides current conditions for insect and disease models at each site, management options that should be considered based on current conditions, and predicted conditions and management options forecasted from one to ten days. DAS also links to the WSU spray guide so that information about possible materials for control is readily accessible. New and current features of DAS and implementing DAS into our pest management programs will be discussed at PMTP field tours.



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