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Because named cultivars have root systems that are fibrous and shallow , they do not tolerate dry sites without supplemental water . At present , such classifiers have been successfully tested locally . As part of the observa-tions , passes were planned to repeat the earlier April orbits at the beginning and end of the mission . Currants and gooseberries should be planted at least an inch deeper than they were in the nursery , in holes deeper and wider than their root systems . In the case of Landers-related surface deformation ( Massonnet et al ., 1993 , 1994 ; Peltzer et al ., 1993 ; Zebker et al ., 1994a ) , several features have been identi-fied that would be very difficult , perhaps impossible , to detect on the ground . Diseases must be properly identified and their biology understood if they are to be successfully managed . One model of the denudation / uplift balance makes the erosion rate linearly dependent on elevation ; if this is the case , the uplift rate along the ridge of the central mountain belt would be considerably greater than the 5.5 mm / yr average quoted above . In addition to monitoring tundra biomes , ERS-1 SAR imagery was used to study boreal forests , focusing on issues related to the terrestrial carbon cycle . ) have shown this to be true in fire-disturbed black spruce forests in Alaska , where fluxes of CH4 and CO2 were greater within the burned sites than unburned sites . The radar data ( backscatter magnitude only ) were not adequate for habitat mapping , which was accomplished with TM data . Make sure that soil and light requirements are met and that the roses are planted at the correct depth . Fruit is produced on one-year-old wood . Most of the empirical research on this topic has been limited to small basins because of the extensive field work required . The consensus of this group was that the ability of imaging radars to detect ecologically important characteristics of vegetated landscapes is well founded in both theory and observation . Backscatter from non-inundated sites was low , that from herbaceous inundated sites was high , and that from sites with the water table at the surface was intermediate , mirroring methane exchange rates for the region . In contrast , the multifrequency , polarimetric airborne SAR data collected over the wetlands in Belize ( Pope et al ., 1994 ) were capable of mapping Eleocharis sp. dominated marshes , which have been shown to be important breeding habitats of the malaria vector Anopheles albimanus ( Rejmankova et al ., 1993 ) . If rust has been a problem in previous years , use resistant cultivars when planting . Denudation rates from individual river drainage basins can vary by orders of magnitude , but we are far from understanding the reason for this large variation . Although ERS-1 has been joined by ERS-2 , there are no plans yet in place to optimize either satellite for interferometry . Later research failed to confirm the high rates , and suggested that the anomalies were most likely associated with water vapor variation in the troposphere . Trees are precocious , bearing fruit as early as one year after planting . If you observe unusual symptoms ( e.g ., wilt , angular leaf spot , deformity ) of plant disease that are inconsistent with gray mold , and Botrytis is recovered , it should be assumed that Botrytis was acting as a decay agent and did not cause plant death . The cause of aster yellows is a microscopic organism called a phytoplasma ( formerly called a mycoplasma-like organism or MLO ) . Fourlined plant bugs are active for about a month ; there is one generation each year .