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Apply nematodes when iris leaves are almost fully expanded but before flowering . Apple scab is the most damaging disease of apple trees in Minnesota . Make sure that soil and light requirements are met and that the roses are planted at the correct depth . It is hoped that these data are sufficient for developing suitable algorithms . For example , the data presented by Goldstein et al. ( 1993 ) on the Rutford ice stream was one of 12 examples tried ; only two cases provided meaningful results .