Issue link: http://read.dmtmag.com/i/110873
There is zero tolerance for plum curculio or cherry fruit fly larvae in cherries for processing. In working with the new pesticides, Gut studied emergence patterns as well as the numbers of insects and found an increasing number of cherry fruit fly adults in tart cherry orchards as the early July harvest approached. He believes this is because cherry fruit flies are infesting fruit left on the trees after shaker harvest. He now recommends that growers make one application of an effective insecticide within a week after harvest to kill these flies and reduce the number of larvae that will contribute to an overwintering population to infect the next crop. C O L U M B I A B A S I N Tart cherry growers need to do more spraying after harvest than they once did. They need to keep healthy leaves on the trees longer to assure good tree health and fruit quality in future years, so they now spray more postharvest fungicides to reduce the effects of cherry leaf spot. Now, insecticides should join the tank mix, Gut said. ��� N U R S E R Y OuR V ARIETIES ARE ���EPA is phasing out our most effective material.��� ���Larry Gut cancellation order to permit use of the existing stocks in the growers��� possession,��� the announcement said. The EPA said it was appropriate to allow growers to use their remaining stocks for one more season���through September 30, 2013. Though the decision would stretch out use for another year, it would not result in any greater use of the product, and it would avoid the need for costly disposal arrangements for stocks in growers��� hands. Michigan���s entomologists, and growers, fought hard to keep azinphosmethyl���and are still concerned they might not be able to adequately control some pests with the ���reduced risk��� replacement products. The new materials, Gut said, need to be ingested by pests; they do not kill by contact as Guthion does. Pests such as cherry fruit fly and apple maggot adults are not heavy feeders, making it more difficult to get them to consume a lethal dose. Growers have about ten days to target the pest after these flies enter the orchards, during which time they mate and prepare to lay eggs. The newer insecticides have their effect during the times when adults consume small amounts of food or the brief time after eggs hatch and larvae dig their way into fruit. Once inside, they are protected and can���t be killed by the new insecticides. Guthion could do that, too. ���EPA is phasing out our most effective material,��� Gut said at the Northwest Michigan Orchard and Vineyard Show in Traverse City in January. ���Cherry fruit fly is our most important pest.��� He suggested that growers set traps, fairly high in the tree, to catch the first flies and set the time frame for spraying. Using new materials, they must spray within the first five days to assure they kill flies before egg laying begins. This timing of the Guthion spray will also hit plum curculio, another pest that can put a white worm in a red cherry. www.goodfruit.com Proven& Profitable Successful orchards start with productive future tree varieties. Columbia Basin Nursery offers a number of polular and proven tree varieties. If you will be planting soon, start your successful future now with a call to Columbia Basin Nursery. Call today for a complete listing and availability. PEARS APPLES CHERRIES Bartlett Columbia Red D���Anjou Comice Concorde�� D���Anjou Forelle Golden Russet�� Bosc Hailey Red��� Bartlett Noble Russet�� Bosc Red Clapp Banning Red Fuji Blondee�� Brookfield�� Gala Buckeye�� Gala Honeycrisp Jonastar�� Jonagold Midnight�� Red Spur Morren���s��Jonagored Supra��� Pacific�� Gala Ultima��� Gala Bing BlackPearl�� Chelan��� Early Robin�� Lapins Rainier Regina��� Santina��� Skeena��� Sweetheart Tieton�� Van Sour Cherry Montmorency We offer over 100 Varieties of Apples, Apricots, Cherries, Nectarines, Peaches, Pears and Prunes & Plums. 800/333-8589 www.cbnllc.com GOOD FRUIT GROWER MARCH 1, 2013 29