Skip to main content Skip to navigation

Tree Fruit News – May 2022


Graph depicting temperature and dates from four locations

Summary of WSU session on cold weather effects on pollination, fruit set, and hardiness in apples and cherries.

On April 12, 2022, Matthew Whiting, Professor in the Horticulture Department, and Bernardita Sallato, Tree Fruit Extension Specialist, at Washington State University, hosted a meeting to bring the tree fruit industry together and discuss challenges…
cherry disease progression

What does the X-disease/Little Cherry Disease Test Results Numbers Means in Terms of Disease Progression?

Summary by Corina Serban, WSU Extension, Scott Harper, WSU Plant Pathology. May 3, 2022. Updated June 2, 2023. The little cherry and X-disease outbreak has become a singular threat to the PNW cherry industry, causing…

Effective Pollination Period and Parentage Effect on Pollen Tube Growth in Apple

Flower receptivity is a limiting factor for the fertilization of several tree fruit. The effective pollination period (EPP) can be used to determine flower longevity and identify limiting factors by assessing stigmatic receptivity, pollen tube…

Microtensiometers: a new tool to monitor your apple trees for deciding when and how much to irrigate

Microtensiometers are sensors that continuously monitor tree water status with potential to be used for growers to help in making irrigation decisions.

Microtensiómetros: Una nueva herramienta para monitorear sus manzanos y decidir cuándo y cuánto regar

Los microtensiómetros son sensores que se instalan en el tronco del arbol y monitorean continuamente el estatus hídrico de la planta. Estos sensores tienen gran potencial en la toma de decisiones acerca del riego.

Managing your crop load in the craziness of Spring 2022

Chemical thinning and crop load management is difficult enough in a normal season, but what in the heck should we do this year? Here are some thoughts and resources that may be helpful.

Cold weather can be tough for trees and for bees. Strong colonies and lots of them is a good place to start

Cold temperatures keep bees from flying. This topic of bee flight and temperature comes up a lot. Almost everything I read says bumble bees and blue orchard bees will forage at lower temperatures than honey…

Protecting your fruit from frost and freeze resources

Given the cold weather that started April 10, 2022, that our region experienced, there were a lot of questions from the growers regarding the frost protection on apple and cherry trees. Below are a few…
Cherry leaves appearing pale green in color.; apple orchard with vigorous dark green growth.

Nutrient Management in Sweet Cherries

In perennial fruit trees, most nutrient uptake occurs between bloom and rapid vegetative growth. Sweet cherry root growth starts when soil temperatures reach approximately 59 F during spring, usually after bloom in Washington soils. In…

Blue orchard bees

As early spring bees, BOBs are better adapted for flying under poor weather conditions than most other bees. BOBs forage and pollinate under overcast skies and at temperatures as low as 54°F (12C), when other…

How to Effectively Manage Codling Moth

Without any intervention, codling moth numbers increase about four-fold from generation to generation. Therefore, targeting the first generation is important to reset the population size to a minimum. Control measures for subsequent generations can be…

Using the Pear Psylla Phenology Model for “soft” (IPM) Programs

Using the pear psylla phenology model in the WSU Decision Aid System can increase the effectiveness of a pear psylla IPM program (i.e., a “soft” program). IPM programs keep pear psylla below economic thresholds using…

2022 Fresh and Processed Pear Committee Research Grant Awards

Based on the recommendations of the Pear Research Subcommittee (PRSC), the Fresh and Processed Pear Committees (FPC & PPC) approved $255,575 to fund five (5) new pear projects in March 2022.

Cold wet weather favorable for cherry blossom blast

Written by Dr. Youfu “Frank” Zhao, Professor & Endowed Chair in Bacterial diseases, WSU-IAREC, May 3, 2022 Bacterial canker risks we experienced in April 2022 and what growers should be looking for to assess damage…
Figure 2 X-disease phytoplasma on Bing cherry.

Resources for Little Cherry & X-disease Scouting and Sampling 2022

Multiple resources are available for scouting and sampling of X-disease and Little Cherry disease during the 2022 season.


Assessing Cold Damage – a Demonstration

This is the last of a four-part series from the sweet cherry cold hardiness webinar held on Oct 29, 2020. In this video, Assessing cold damage, Dr. Matthew Whiting, WSU professor, demonstrates how to assess…

How to check for apple bud damage on the tree

Looking for apple bud damage? Watch as Washington State University’s Matthew Whiting shows how to quickly cut and evaluate apple buds on the tree and identify flower part damage

Cómo verificar si hay daños en la yema de la manzana en el árbol

¿Busca daños en los brotes de manzana? Observe cómo Bernardita Sallato, de la Universidad Estatal de Washington, muestra cómo cortar y evaluar rápidamente los capullos de manzana en el árbol e identificar los daños en…
thumbnail of video

Enfermedad de la cereza pequeña en cerezos

Bernardita Sallato comparte información respecto a la enfermedad de la cereza pequeña, síntomas para su identificación, medidas de prevención y control de vectores.
video thumbnail

Symptoms of X-disease Phytoplasma in Stone Fruit

X-disease in peaches, plums and nectarines causes yellow leaves, shot hole and small deformed fruit.

Scouting and Sampling for Little Cherry Disease

Tips on scouting and sampling for X-disease and Little cherry disease which cause small, pale unmarketable fruit in cherries.



Queen Rearing and Bee Breeding Workshop

June 22 – June 23 Ready to take beekeeping to the next level? For those of you who already have a working foundation in beekeeping, the WSU bee team is offering an event to introduce you to…

Symposium – Honeybee Reproductive Technologies

The interest and need to advance bee breeding techniques and to address the conservation of threatened subspecies and ecotypes is of global concern. The focus of this symposium is to demonstrate and share reproductive technologies…

Field Tour Sign Up: Growing Your Farm to Make Conservation Profitable

Join your local NCW conservation districts on a field tour of a local orchard and vineyard and learn about conservation practices that could potentially reduce management costs.


Sweet Cherries

L. Long, G. Lang & C. Kaiser Dec 2020. This new book provides comprehensive coverage of the history, genetic improvements, production physiology of growth and cropping, orchard establishment and management, and harvest considerations for sustainable…


Airblast Spray Application and Modeling Conference

May 16 | Webinar

2022 Virtual Orchard Meetup Series

Jun 2 | Virtual

2022 Virtual Orchard Meetup Series

Jun 16 | Virtual

2022 Virtual Orchard Meetup Series

Jun 30 | Virtual

2022 Virtual Orchard Meetup Series

Jul 14 | Virtual


Karen Lewis
Tianna DuPont
Dani Gray
Gwen Hoheisel
Marcella Magby
Manoella Mendoza
Claire Murphy
Ricardo Lima Pinto
Jodi Rinaldi
Bernardita Sallato
Tory Schmidt
Corina Serban


The May 2022 edition of Fruit Matters was edited by Corina F. Serban, WSU Extension.

Washington State University