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Trees planted on M.26 generally require staking for the first few years of growth or , on windy sites , for the life of the tree . Symptoms are visible as small yellow leaf spots , within one week after the initial infection . After planting , prune all canes back to four to six above-ground buds ; the resulting low bud count encourages the development of vigorous new canes . When handling bare-root plants , make certain to keep the plants cool and moist until they go into the ground ; the delicate root systems must not be allowed to dry or become waterlogged . A repeat treatment 10-14 days after the first application may be necessary . Examine the plants for cankers , that first appear as small , reddish , discolored areas on the stems . If you are seeing foliar symptoms of root rot , examine the roots . Early in the growing season spots enlarge slowly , then , after the iris blooms , the spots enlarge rapidly . The barrier can then be taken down after the feeding phase of the beetle has been completed . After the initial pruning at planting , fruit trees should be pruned on an annual basis in late winter — preferably after the coldest weather is past — before they break bud . If an iris plant has above-ground symptoms ( brown leaf tips , early senescence ) , dig it up and examine the rhizomes . After approximately 12-24 hrs , examine the water with the hand lens . However , while currants and gooseberries are , as a rule , well adapted for the Upper Midwest , very few cultivars have been fully evaluated in outdoor trials by researchers in Minnesota . Inspect all new plants and their associated soil carefully for the symptoms and signs noted above . In this first of three images , observed fringes for the Eureka Valley earthquake are formed by stacking two interferograms ; one fringe represents 14 mm of range change in all three panels because the stacking procedure doubles the earthquake signal .