WSU CAHNRS and Extension

Tree Fruit

Orchard Management


Bioregulators have been used for many years to alter the behavior of fruit or fruit trees for the economic benefit of the fruit grower. Control of vegetative vigor, stimulation of flowering, regulation of crop load, reduction of fruit drop, and delay or stimulation of fruit maturity and ripening are important examples of processes in fruit and fruit trees that can be regulated with exogenous applications of bioregulators.

New candidate bioregulators with possible benefits for fruit growers are continually being made available by private industry. In addition, WSU researchers are continuing to find new uses for bioregulator products that have been made available for other uses. Learn more »

Stress Physiology

Tree fruit crops grown in eastern Washington are frequently exposed to severe environmental stress. Solar radiation is extremely high and often exceeds what can be utilized by trees. The excess light energy is converted to heat energy, especially in the fruit. High air temperatures are prevalent many days during the growing season and also heat the fruit. Consequently, the fruit surface temperature can exceed air temperature by up to 30 °F.

WSU researchers have focused on understanding the causes of several stress-induced disorders in apples and cherries (reports available in PDF format) and then developing practical solutions for growers’ use to mitigate losses from the disorders. Learn more »

WSU researchers have also investigated tree fruit cold hardiness.

Organic Production

Orchardists worldwide are increasing their use of organic and integrated production systems in response to consumer preferences and environmental imperatives. Producers will find resources related to integrated and organic fruit production at this web site, including materials developed at Washington State University as well as from other locations around the world.

Soils and Nutrition

Information regarding the planting and care of new orchards, nutrients required for fruit-color enhancement, nitrogen application, and soil fumigation may be found here. Additional information is located here.

Tree Fruit in Northwestern Washington

Information about growing tree fruit in northwestern Washington is located here.

Tree Fruit, Hulbert 421, PO Box 646242, Washington State University, Pullman WA 99164-6242, 509-335-4561, Contact Us
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