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2.3 and 2.4 ) have both been identified in SAR interferometry images ( Massonnet and Feigl , 1995a ) . If you have purchased a smaller tree with little or no branching , remove any branches , and prune the trunk to about 30 to 40 inches above the ground . Both apple and pear trees will set abundant crops of fruit if conditions are good during bloom . One problem is that earthquakes occur infrequently in any given location , confounding efforts to maintain a high level of preparedness . Closer planting will make training and management of the trees difficult , and the trees may shade each other so that fruit quality is harmed . Most garden soils in Minnesota have pH readings above those that are optimum for blueberries ( most soils are too alkaline ) . A repeat treatment 10-14 days after the first application may be necessary . We note that precise orbit control ( using GPS ) is a critical ingredient to any successful SAR interferometry mission . When choosing an insecticide , be sure the chemical is cleared for use on those plants you wish to treat . False Japanese beetles and Japanese beetles resemble each other . Leaf and stem spots may be controlled best by removing old top material in the fall , cutting the stems at ground level and destroying those parts . The more vertical a branch , the more vigorously it grows , and the less fruit it tends to produce . Thus , it will likely be necessary to use the three-pass approach with ERS-1 and ERS-2 for those observations to generate initial topographic data accurate enough for interferometric change detection . A fungicide program should start in the summer just before leaves become spotted . They are both scarab beetles belonging to the same subfamily , shining leaf chafers ( Rutelinae ) . The main distinguishing feature between the two species is that the Japanese beetle has five tufts of white hair along both sides of the abdomen and two small dots of white hair on the tip of it . Plants ordered from mail-order sources are usually sent bare-root , while those purchased from a local nursery may either be bare-root or potted . One method of control is to hang a very strongly scented bar of soap in each tree in summer . Both species ( Heterorhabditis and Steinernema ) have been shown to attack iris borer . Although other leaf spot and leaf streak diseases do occur on daylilies , it is unclear whether any of these problems are caused by fungi . If you have any doubts , consider putting a new plant in a quarantinearea of your garden , where , if it is diseased , the disease can not spread to other plants . Prune to keep enough open space between each level of scaffold branches that you can imagine tossing a football through : at least a foot of vertical space between branches on the same side of the tree .