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 chemistries to help Washington growers make more informed choices about their spray programs. The results of the most recent study on apple evaluating residues of sixteen insecticides/acaricides and ten fungicides is available below, as well as reports from previous WTFRC projects on apple and cherry and a related 2011 project on cherry insecticide residues conducted by David Haviland of the University of California Cooperative Extension.
2014 WTFRC Cherry Residue Study 2014 WTFRC Apple Residue Study
2013 WTFRC Apple Residue Study 2013 WTFRC Cherry Residue Study
2012 WTFRC Apple Residue Study 2012 WTFRC Cherry Residue Study
2011 WTFRC Cherry Residue Study 2011 Haviland Cherry Residue Study
2011 WTFRC Apple 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.
The Washington Tree Fruit Research Commission (WTFRC) Internal Program has developed a starch index for Honeycrisp (scale 1-6) based on actual starch patterns observed for fruit grown in Washington State. To download a copy, click on the link below.