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Much work is needed to acquire high-quality observations and to make the data available to the scientific community in a standardized format . Together they can acquire data that could prove very useful for vegetation monitoring . Lack of resources is an important factor but , even when substantial resources are available , it is often difficult or impossible to acquire the needed information with available techniques without putting field crews at significant risk . For these reasons , it is necessary to acquire dense temporal and spatial sampling of crustal movements . Beginning the year after planting , renew mulch annually . Since earthquakes do not recur with sufficient frequency to acquire the necessary data in a single location , we must resort to what might be termed an " ergodic " hypothesis and study earthquakes worldwide , with the idea of recognizing patterns associated with broad sets of geological and tectonic circumstances , which presumably apply to other similar areas . For more information about fireblight , see the Yard & Garden Brief “ Fireblight , ” at http://www.extension.umn.edu/projects/ yardandgarden / ygbriefs / p223fireblight.html . If you prune off the wilted shoot near the base and look at it in cross-section , you will see that the water conducting system inside the stem has turned brown . Some varieties are resistant to apple scab ; see Table 1 . Obviously , this does not explain very much of the natural variation in denudation rate . Soil moisture controls plant growth , the hydrological behavior of the soil , and the ability of the soil to resist erosion . It is quite normal to see healthy tissue right next to the diseased portions of the tissue . See Extension publication Culture of Garden Roses , FS-1105 , for more information on cultivation . In seismic zones , the spatial density of points required to explain the sources of crustal deformation is strongly influenced by the thickness of the elastic layer .