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The more vertical a branch , the more vigorously it grows , and the less fruit it tends to produce . The primary short-coming is orbit control . For example , 10-m horizontal resolution and 1-m accuracy for the primary DEM model would better describe the surface spacing and size of important geomorphologic features , especially hill slope variations in arid and temperate regions and river terraces . Some of the more common hosts include daylily , astilbe , hostas , peony , phlox , ajuga , delphinium and potato . 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 . For this reason , cultural control should be the primary form of powdery mildew management . Leave more fruit on the outer portion of the tree and less in the shaded center , where it will not get good sunlight . On time scales of years to decades , meter-level or greater changes in topography may occur , but these are not the primary " observable " for many of the studies described here .