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Most commercially available currant and gooseberry cultivars should demonstrate adequate winter hardiness for our region because they have proven hardy in testing to at least -30 F when fully dormant . The working group felt the demonstrated capabilities of imaging radars for investigating terrestrial ecosystems could best be organized into four broad categories : ( 1 ) classification and detection of change in land cover ; ( 2 ) estimation of woody plant biomass ; ( 3 ) monitoring the extent and timing of inundation ; and ( 4 ) monitoring other temporally dynamic processes , such as freeze / thaw status and soil moisture in fire-disturbed boreal forests . Information on classifying waste and on identifying special waste is given in the Health & Safety Notes 99/022 Rev and 06/029 . Any vertical branch competing with the central leader Dead , broken , or obviously fire blight-infected branches Suckers coming up from the roots or low on the trunk Watersprouts , which are vigorous vertical branches Downward-growing branches . Handpicking is the best control for small numbers of rose chafers . Departments should ensure that records of sickness absence are maintained for the purposes of monitoring the position and to enable Heads of Department to determine if any future action is needed under these procedures . Remove or cut back any branches that are competing with the leader . The mulch will keep weeds and lawn grass from competing with the tree for water and nutrients , while also contributing organic matter to the soil and moderating soil temperatures in the root zone . 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 . Accurate maps of vegetation inundation are critical in identifying breeding grounds for disease vectors and in predicting and monitoring outbreaks of a variety of diseases .