- With cherry bloom behind us, and straw coming up rapidly, it’s time to finalize plans for trapping spotted wing drosophila (SWD), and thinking about which trap/lure combination might work best for your situation. We’ve come a long way since the ‘apple cider vinegar in a deli cup’ days, and now have quite a selection of commercial products to choose from in both traps and lures.
- When it comes to concerns over pesticide residues, cherry growers require a lot of complex, up-to-the-minute information to make appropriate management decisions. Specifically, they need to know exactly where their sales desks intend to export their crop, the most current Maximum Residue Levels (MRLs) allowed for every pesticide they apply in each of those foreign markets, AND have a reasonable idea of what residue levels are present for each of those pesticides on their fruit at harvest. Fortunately, there are resources available to help growers navigate this thorny regulatory thicket.
- When researchers think about weed control in crop production, we often think about 'short-term' results, i.e. weed control after 30 days, weed control after 90 days, weed control at harvest, etc. But weeds and weed control efforts in one cropping season can significantly influence the density and composition of weeds in following years. The carryover between seasons is accomplished via the weed seedbank and weed control successes and failures are reflected by changes that occur in this reservoir (Figure 1). In good years, weeds are successfully controlled and few to no seeds may enter the seedbank. In bad years, when weeds escape management strategies, rogue plants may flower, set seed, and contribute to this genetic stockpile. Think about these steps to manage the seedbank.
- Calcium management is critical to control bitter pit, especially for susceptible varieties. Good management should always be systems-based starting with adequate supplies in the soil, good tree and root health, sufficient water to move calcium into the plant and appropriate crop load management. Supplemental calcium sprays are important during early fruit development. Start in early June for best effectiveness. The following recommendation comes from the WSU Crop Protection Guide.
- In Dr Wang’s recent study he found that the previous recommendation of three calcium applications did not increase concentrations of calcium in the fruit. Six applications between pit hardening and harvest was able to increase calcium levels from 450 to 650 ppm. Nine applications did not do a better job than six. Early applications before pit hardening were also not effective. The concentration of Ca 2+; was also important. Ca 2+; between 0.1 and 0.15% performed the best. Ca 2+; of greater than 0.2% increased the potential for leaf burning and reductions in fruit size. Ca(NO3)2 or chelated Ca is recommended. Calcium chloride is not recommended on cherries.
- Drs. Bruce Barritt, Ines Hanrahan and Mr. Tom Auvil describe WA38 'Cosmic Crisp™' cultivar characteristics, tree handling, rootstocks, pollination, thinning, the issue of stem punctures, stem clipping, fruit size, shape, color and post harvest performance.
- The WA 38 (or Cosmic Crisp™) trial compares vertical spindle, bi-axis and V-trellis training systems and both the M9-Nic29 and Geneva 41 rootstocks. Trial results are discussed by trial participants. Topics discussed include pruning and training (dormant and summer, by hand or machine), bending versus click pruning, blind wood, vigor management, fire blight, pollinizers and crop load management.
- International pear conference coming to the USA for the first time.The Pacific Northwest will welcome pear industry researchers, experts, growers and marketers from around the world to the 2017 Interpera Congress in Wenatchee, Washington on June 15 -16, 2017. This is the 10th meeting of this world-wide pear conference and the first to be held in the United States.
- Registration for the Washington State FSMA Water Quality Testing Workshops is now open! The Washington State Tree Fruit Association will host two workshops in collaboration with the Western Center for Food Safety (WCFS) from UC Davis, the Northwest Horticultural Council and the Washington Tree Fruit Research Commission, on May 9th in Yakima and 11th in Wenatchee.