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Show Check trees for maggots Anyone who owns a cherry tree in Utah, whether' it's in the back yard or a commercial orchard, may have to spray the tree if it becomes infested with apple maggots. . Vince Jones, an entomologist with Utah State University Extension, Exten-sion, said the Utah Department of Agriculture has the authority to require re-quire homeowners, and commercial commer-cial growers to treat trees suspected sus-pected of hosting apple maggots. "In several areas of the state, cherries and hawthorns will be up to 100 percent infested with apple maggot or western cherry fruit fly if no treatments are applied," Jones said. Utah, Cache, Salt Lake. Davis and Box Elder counties are likely to have the heaviest infestations, Jones said, but the pest will be found in other areas as well. Apple trees are usually the primary prim-ary hosts for apple maggots in areas outside Utah, but the pests have found cherry trees to their liking lik-ing in Utah. They also attack both native and ornamental hawthorns. Even though apple maggots have yet to be found in any Utah apples, their presence in the state has led several states, including California. Califor-nia. Idaho, Colorado, Washington and Oregon to quarantine Utah apples ap-ples unless they've been property treated for shipment. Jones said growers face quarantine quaran-tine action for commercial apples if any fly is caught within two miles of their orchards. The Utah Department De-partment of Agriculture must monitor all known hosts between commercial orchards and the two-mile two-mile limit. Also, if any fly is caught within one-half mile of commercial apples, ap-ples, the owners must place insect traps every 100-150 feet, on the orchard borders, apply apple mag- got sprays immediately and treat I the trees every two weeks until just : before harvest. "Homeowners or commercial ; growers dodging their responsibil- ity can cause serious harm to other : growers who ship inter-state," : Jones said. Flies cannot be identified from the larvae; the adults must be : trapped. : Homeowners can monitor apple maggots by using yellow sticky cards, which are available commercially. com-mercially. "Regulations require that when one fly is found a spray must be applied," Jones said. The sprays homeowners can use include Imidane, Zolone, Diazinon or Malathion to control apple maggots mag-gots on both cherries or hawthorns. hawth-orns. Imidan should be used only on sour or tart cherries, not on sweet cherries. USU Extension county agents have more information on apple maggots and the proper spraying times and techniques. As with all pesticides, users should carefully follow label instructions. |