Good Fruit Grower

June 1

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6 JUNE 2015 GOOD FRUIT GROWER www.goodfruit.com Cornell publishes series on apple IPM for beginners C ornell University has published a new integrated pest management series of 15 fact sheets under the title "Apple IPM for Beginners." The series was edited by Deb Breth, with the Cornell Cooperative Extension Lake Ontario Fruit Program, with contributions from seven entomologists, horticulturists, and disease control specialists. The fact sheets can be downloaded in PDF format either individually or as a complete guide. It can be found at www.fruit.cornell.edu/orchard-ipm. "These fact sheets and scouting guides are a compro- mise between the most accurate, complex information researchers have to offer and the amount of information a beginner can take in," Breth said. Fruit fl ies fl ourish in non-crop host plants S potted wing drosophila do not depend on fruit and berry growers' crops for their food, shelter, and repro- duction. They can live in non-crop host plants nearby from which they can move into orchards as commercial fruits begin to ripen. A new guide to non-crop host plants used by spotted wing drosophila (SWD) has been published by Oregon State University, compiling informa- tion from collections made in Michigan, New York, Florida, California, Oregon, Washington and British Columbia. A three-page fact sheet titled "Noncrop Host Plants of Spotted Wing Drosophila in North America" is available as a free PDF on the Michigan State University spotted wing drosophila website (www.ipm. msu.edu) and at other univer- sity websites. It lists about 40 kinds of non-crop fruits that support SWD larvae, along with color pictures of some of them. "This information combines what was learned from collec- tions of fruit in wild and agri- cultural habitats since this pest arrived in North America seven years ago," said Dr. Rufus Isaacs, Michigan State University entomologist who, along with his colleague Steve Van Timmeren, collected fruit and then held it to see what insects emerged. The research entomologist authors, in addition to Isaacs, include Jana Lee, USDA-ARS Horticultural Crops Research Unit; Amy Dreves, Oregon State University; Greg Loeb, Cornell University; Howard Thistlewood, Pacifi c Agri-Food Research Centre, Agriculture and Agri-Food Canada; and Linda Brewer, Oregon State University. "The information can be used by growers and others to consider which areas may be most likely to provide a reservoir of habitat for this pest," Isaacs said. "There is little information on the effec- tiveness of removing these non-crop host plants from a landscape, but high densities of these suitable hosts can be expected to increase pressure from SWD." Not surprisingly, the list includes relatives of domes- ticated crops—cherries, berries—but it also includes weeds like pokeweed and nightshade and shrubs like honeysuckle. QUICK BITES People and industry in the news. Read more Fresh Updates at goodfruit.com/fresh-updates 1 S potted wing Drosophila (SWD), Drosophila suzukii, is an invasive y that lays eggs in ripening and ripe berries, and stone fruits. e developing larvae can make the fruit unmarketable, so this pest is a concern to producers, packers, processors, and distributors of these crops. Landscapes surrounding fruit production elds oen include hedgerows, adjacent eld margins, and woody or riparian areas with ornamentals, unmanaged shrubs, vines, or other plants that also produce fruits. Noncrop habitats can meet the requirements that favor SWD adults and their natural enemies: food, shelter, shade, and humidity. In addition, many noncrop fruits can support developing larvae of SWD. As populations of SWD build in noncrop hosts, these areas can become "hot spots" from which SWD can move into elds as commercial fruits begin to ripen. In some regions, these plants are important for late season population buildup outside crop elds. From this publication, commercial and backyard fruit growers and eld advisors will learn which plants can serve as alternate egg-laying sites for SWD. is list of noncommercial fruits was developed from multiyear sampling to determine likely noncrop hosts for SWD larvae. Regional dierences in the importance of each plant host may occur due to dierences in environmental conditions. e list is not exhaustive but includes what is known at this time about plants commonly found in British Columbia, Washington, Oregon, California, Michigan, New York, and Florida. We expect this list to expand as more becomes known about noncrop hosts for SWD. Jana Lee, USDA-ARS Horticultural Crops Research Unit; Amy J. Dreves, Department of Crop and Soil Science, Oregon State University; Rufus Isaacs, Department of Entomology, Michigan State University; Greg Loeb, Department of Entomology, Cornell University; Howard Thistlewood, Pacic Agri-Food Research Centre, Agriculture and Agri-Food Canada; and Linda Brewer, Department of Horticulture, Oregon State University. J. Lee, A. Dreves, R. Isaacs, G. Loeb, H. Thistlewood, and L. Brewer E M 9 1 1 3 • A p r i l 2 0 1 5 Noncrop Host Plants of Spotted Wing Drosophila in North America Blue elderberry Thistlewood Lab, Agriculture and Agri-Food Agriculture et Agroalimentaire Canada Cherry laurel Amy J. Dreves, © Oregon State University A new spotted wing drosophila guide has been published by Oregon State University. Get the results you want with KDL ® 0-0-24, AGRO-K's foliar nutrient fruit sizing and color program BIG cherries with great color and high sugar offer growers the best returns. Large bloom and heavy sets increase the risk of small fruit and uneven maturity. Maximize your returns by maximizing your fruit size and uniform maturity at harvest with KDL ® , Agro-K's foliar cherry size and color promoter. Peak demand timing for potassium in cherries begins at color break and should be supported by foliar potassium, in the right form, to maximize cherry size, color and sugar and to encourage uniform fruit maturity at harvest. KDL's unique sugar-based potassium formulation is designed for fast and complete uptake and when applied beginning at color break, can dramatically improve cherry size, color and sugar, while encouraging uniform fruit maturity. KDL links potassium to a sugar complex that quickly penetrates fruit and leaf tissue – encouraging the sugar development process within the leaf and aiding in transport into the fruit – leading to increased sugar levels and improved color. KDL also maximizes cell bulking leading to larger, firmer cherries that ship better and store longer. Bulking, sugar content and color are all indicators of ripening fruit. By influencing these quality factors, KDL also promotes greater uniform maturity at harvest for less small green fruit. KDL is compatible with most pesticides used for powdery mildew and fruit fly. For more information on how KDL ® can influence your cherry crop, contact Agro-K today. AGRO-K CORPORATION 8030 Main Street, NE • Minneapolis, MN 55432 800-328-2418 • www.agro-k.com When BIG isn't big enough! Science-Driven Nutrition SM

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