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spec: The ability to accurately detect changes in topography will be especially useful for studying geomorphic processes , such as progressive sedimentation or trenching of alluvial fans , broad floodplain sedimentation patterns and delta exten-sion , formation and movement of large dune fields , and large-scale development of gullies - - e.g ., the type rapidly forming in steep , intensively cultivated terrains in Asia , Africa , and South America . Aluminum sulfate is not recommended as high rates of this compound can be toxic to roots . With each watering apply between and 3/4 inches of water . Because you want your new shrubs to become established before the onset of hot weather , set out either bare-root or potted plants in spring as soon as the soil can be worked ; do not be afraid to plant early in the season , as even a plant that is beginning to leaf out can tolerate temperatures as cold as 19 F. In a consumer economy it is easy to lose sight of the long-term power of compound interest . Not everyone agrees . There are several iris diseases with similar symptoms that can occur when iris borer is absent , including bacterial soft rot , iris scorch ( probably caused by a phytoplasma ) , and fungal leaf spot ( Didymellina macrospora ) . This section examines five essential network security technologies that should be embedded within the network and integrated into the products that comprise the network infrastructure . Iris leaf spot is a common disease caused by the fungus , Mycosphaerella macrospora ( formerly Didymellina macrospora ) . They've also been seen in St. Paul , Stillwater , Hastings , Rochester and Winona , according to Doree Maser of the Minnesota Department of Agriculture .