Thank you for visiting the Washington Tree Fruit Research Commission's website. Since 1969, we've been supporting researchers in their efforts to explore ways to improve fruit storage, decrease insect effects on fruit and grow better fruit which will increase the revenues of the growers of Washington State.
In response to increasing industry concerns about meeting Maximum Residue Levels (MRLs) for pesticides in foreign markets, the WTFRC initiated studies in 2011 in apple and cherry to develop some residue data for commonly used insecticides and fungicides to help Washington growers make more informed choices about their spray programs. The WTFRC Internal Program recently completed its 2016 study in cherry which included 16 insecticides/acaricides, 9 fungicides, and a potash & phosphite foliar fertilizer, as well as considering the effects on residues from spraying those materials dilute (400 gal water/acre) or concentrate (200 gal water/acre). The results of that study are available below, as well as similar reports from previous years on apple and cherry; results of an ongoing WTFRC residue study in apple will be posted in early September.
2015 WTFRC Cherry Residue Study
2012-2014 WTFRC Cherry Residue Summary
2014 WTFRC Cherry Residue Study
2013 WTFRC Cherry Residue Study
2012 WTFRC Cherry Residue Study
2011 WTFRC Cherry Residue Study
2011 Univ. California Extension Cherry Residue Study
The WTFRC internal program has developed a grower version of a bench-top test to determine cherry cracking susceptibility. Detailed instructions can be downloaded by clicking on the link below.