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Powdery mildew can be a serious foliar disease in some years and some locations ; for control of powder mildew or another specific insect or disease pest , contact your county extension office . The data collected during these missions provide an important opportunity to further evaluate the utility of imaging radar data for examining surface characteristics important in a wide range of ecological processes . Southern blight can be confused with white mold ( Sclerotinia sclerotiorum ) , another fungus with a broad host range that produces white , cottony mycelia . Pruning the trunk back in this way is intended to induce branching that will result in scaffold branch options the following year . Since the current plan for the Global Topography Mission includes the use of a laser altimeter , we have called out applications that would benefit from those data as well where appropriate . Successive SAR images in urban areas over periods of several months may be able to detect subsidence directly . You don ’ t want to train a branch to be truly horizontal or to grow downwards ; it should still be growing more or less upwards . Fires are an extremely important factor to a variety of processes which affect forest succession and biogeochemical cycles in boreal forests ( Bonan and Shugart , 1989 ; Kasischke et al ., 1995b ; Viereck , 1983 ) . It was thought that the overwintering structures of this fungus were not cold hardy , but they have now been shown to survive winters when under cover of snow and / or mulch . Spacing irises in this manner increases air circulation around leaves and provides room for growth . Birds can eat the entire crop of a small planting if it is not protected . Plants may be spaced as close as three feet apart for a hedge-type system in rows at least six feet apart . Lichen cover is virtually the only biological retardant for soil erosion and one that is easily destroyed . The background color ( the area not covered by red pigment on red varieties ) should be greenish yellow , indicating that the apple was picked at full maturity . Currants and gooseberries are self-fertile , but research suggests that planting more than one cultivar results in better yields .