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Adult fourlined plant bugs overwinter as eggs laid in clusters into a slit near the top of canes of currants , brambles and other woody plants . Rose chafers seldom fly over the barrier and onto the plants even though the barrier is open at the top . Although pear trees are generally susceptible to a number of disease and insect problems , the fact that they are relatively uncommon in the Minnesota landscape often prevents these problems from becoming severe for home gardeners . The fence must be high enough so the rabbits cannot get over the top when the snow is deep . We envision a SAR mission capable of two separate modes of operation : ( a ) a monitoring mode in which global coverage is offered to guarantee that " before " pictures are available in all areas of interest with reasonable repeat times ; and ( b ) a rapid-response mode to allow acquisition of " after " pictures shortly after an event of interest . The whole plant is generally stunted and spindly , and the top is often killed . If you discover iris borer damage early in the season , you can crush the insect while it is inside the leaf or remove the infested leaf . Errors in the DEM contributed about 9 mm of noise to the coseismic offset estimates obtained by Massonet et al. ( 1993 ) , where rms vertical errors in the topographic data were estimated after the fact to be about + / -24 m. Systematic errors in selected areas can , of course , be much larger than this . Perhaps this is due to the pear tree 's reputation for becoming very large , for its history of susceptibility to fire blight disease , or the fact that varieties hardy to our region do not include the well-known and popular ' Bartlett ' or ' Bosc . The differential phase contains information on the range change to the radar antenna , thus providing information on the surface change , precise to a fraction of a radar wavelength , or to a few millimeters to centimeters for typical radars .