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Science Discipline Panel workshops and meetings , held in Late October and early November focused on Questions 1-4 . The Yard & Garden Brief , “ Apple Scab ” contains detailed information about identifying and controlling this disease . Infection often begins at the site of the flower or bud . Neither the synoptic view nor controlled geometry of a space platform are attainable by airborne or ground techniques , while problems of air space restrictions disappear with a space platform . Once the tree has rough and flaky mature bark , neither winter sun nor chewing animals can harm it , so tree guards will not be necessary . In turn , this change in stream dynamics produces an enlargement of the stream channel because of increased erosion of the channel during times of high discharge and lesser amounts of in-channel deposition between flood events . Together , elevation , slope , and aspect ( north vs. south facing ) exert enormous control on surface hydrology and ecosystems . Example applications include measurement of Greenland and Antarctic ice-sheet elevations ( Thomas et al ., 1992 ; Blankenship et al ., 1993 ) , outlet glacier strains and shape changes due to surge events ( Garvin and Williams , 1993 ; Garvin et al ., in revision ) , and the structural properties of vegetation canopy , such as tree height and biomass ( Aldred and Bonnor , 1985 ; Nelson et al ., 1988 a , b ) . Peonies can be healthy , vigorous and disease-free if grown on a favorable site that includes full sun , good air circulation , adequate water , and good drainage . For more information about fireblight , see the Yard & Garden Brief “ Fireblight , ” at http://www.extension.umn.edu/projects/ yardandgarden / ygbriefs / p223fireblight.html . A simple Mogi ( point-source ) model for volcanic deformation , showing displacement rate vs. horizontal distance from the center of deformation . These teams would be funded to exploit data from both NASA and non-NASA sources , and would be charged with development and testing / validation of new applications , both scientific and commercial in nature . Rhizoctonia crown rot of daylilies occurs in wet years or in poorly drained soils . Finally , the polarization combination of the received backscatter is dependent on the polarization of the transmitted microwave power and on the horizontal and / or vertical orientation of the scattering elements present in the vegetation . Leaf spot caused by Botrytis infection occurs in young , tender seedlings or when infected flower petals contact the plant leaves .