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By this we mean that , within a given pixel , the position of radar scatterers has not changed to any significant degree , but the ensemble of scatterers ( i.e ., the entire ground surface within that pixel , as well as some adjacent ones ) has moved up , down , or sideways in some correlated fashion . The good news , however , is that the main differences between grocery store pears and those we can grow here are size and fresh fruit keeping ability . Be careful not to spill any soil , which may contain sclerotia . One problem is that earthquakes occur infrequently in any given location , confounding efforts to maintain a high level of preparedness . 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 . Nematodes need a moist environment to survive and move . Dwarfing and Standard Rootstocks When purchasing an apple or pear tree , one is actually selecting a plant made up of two genetically different individuals grafted together , the " scion " and the " rootstock ” ( Figure 1 ) . Cultural practices will reduce the severity of iris leaf spot during dry years . It is very important to clean your pruner by dipping in 10 % bleach solution or by spraying it with 70 % rubbing alcohol after cutting off diseased plant material and prior to pruning any healthy plants . Grafting describes any of a number of techniques in which a section of a stem with leaf buds is inserted into the stock of a tree . Once plants are not growing any longer , cut peony and iris foliage back to the ground and remove from the site . If each pixel on the ground behaves the same for each observation , calculating the difference in the phases removes dependence on the scattering mechanism and gives a quantity dependent only on imaging geometry . 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 . Discard rhizomes containing iris borer caterpillars and those with tunnels . Most garden soils in Minnesota have pH readings above those that are optimum for blueberries ( most soils are too alkaline ) . Reducing the deer population is a temporary solution at best , and an option not available to fruit growers except those in rural areas . We note that precise orbit control ( using GPS ) is a critical ingredient to any successful SAR interferometry mission .