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Tree Fruit News Apr 2020

Tree Fruit Extension Response to COVID-19

We are here. Even though our county offices and Research and Extension Centers are closed to the public and most office work is being done from home, we are still on the job. Critical and time sensitive lab and field work continues where and when it can be done safety and within the Stay Home, Stay Healthy order and guidelines set by WSU Administration and our county partners…more



Bee-ware the Giant Asian Hornet!

Two different Asian pests have found their way to North America: the Asian giant hornets, Vespa mandarinia in Whatcom County and Vespa ducalis in British Columbia. If either of these pests become established, it could…

Prebloom Management of Pear Psylla with Particle Film

Attention pear growers! Although it is still winter, we are approaching the time when pear psylla begin recolonizing orchards. This is a reminder to start preparing for dormant sprays of kaolin clay (i.e. Surround) to…

Notice: Sterile Insect Release May Impact CM Traps Catches

Written by Kacie Athey, WSU Entomology and Dustin Krompetz, M3 Consulting Group LLC. Mar 2020 Neighbors within 1/4 mile of sterile codling moth release sites may see their Delta traps fill up with sterile codling…

Apple Decline

Apple decline, an emerging problem for apple production in both the U.S. and Canada, is characterized by the rapid dieback of young trees. Many potential causes have been proposed, including genetic incompatibility, winter injury, herbicide…

Plan for Multiple Fire Blight Conditions, Be Agile

Make a plan now to be ready to prevent fire blight in your orchard this year.

Chemical Thinning Options for Bartlett Pears

In the face of relentlessly increasing labor costs and frequently disappointing returns, many pear growers are looking for ways to reduce their input costs and improve their packouts.  For most pear varieties, the main challenge…

WA 38 Size Distribution Profile in Pre-Commercial Plantings

The purpose of this report is to show the fruit size distribution of two maturing orchards between the years 2010 to 2016 (years 2-8 of production) and to show the variation of sizing profiles in…


Compost Use For Tree Fruit

Compost can help improve soil quality and nutrient, water, and pest regulation. High-quality soil holds water and nutrients like a sponge, slowly releasing them over time to meet tree needs. High-quality soil can also suppress…


Flowering Fruit Set & Pollination

Flowering is a critical time for growers because fertilization rate has a fundamental relationship to yield and there is a short window of opportunity to set the crop for the year. The processes of pollination…


ISHS Orchard Systems 2020 Symposium & IFTA 2020 Summer Study Tour

Due to the uncertainties surrounding COVID-19, the ISHS XII International Symposium on Integrating Canopy, Rootstock and Environmental Physiology in Orchard Systems scheduled for July 2020 in Wenatchee has been postponed. The committee is working on rescheduling for…


Differences Between State and Federal Worker Protection Standard Requirements

Washington State Dept. of Labor & Industries has more restrictive requirements for worker safety than the federal Agricultural Worker Protection Standard.  WSDA developed this fact sheet to outline the differences between the two. 


Recursos COVID-19 para la industria de productos agrícolas de Washington

COVID-19 Resources for the WA Produce Industry

MCN COVID-19 and Farmworker Health

ISHS 2020 Postponed to 2021




Karen Lewis

Jenny Bolivar-Medina

Tianna DuPont

Gwen Hoheisel

Bernardita Sallato

Tory Schmidt

Corina Serban


Washington State University