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The great advantage of SAR is that the observations are acquired with virtually complete spatial coverage , rather than the sparse observations inherent in conventional ( including GPS ) geodesy . Unfortunately , insecticidal soap is generally not very effective against mobile insects such as fourlined plant bugs . Some apple varieties produce strongly vertical growth and need more training ; others tend to produce branches that are naturally well-angled . They have been reported to damage roots of corn , potatoes , strawberries , sweet potatoes , and various grasses . Clematis is subject to infection by several diseases including powdery mildew ( Erysiphe ploygoni ) , crown gall ( Agrobacterium tumefaciens ) , and various leaf spots ( Cercospora squalidula , Septoria clematidis ) . The spreader — as simple as a notched stick , but otherwise available in various forms at a well-stocked garden center — is wedged in between the branch and the trunk to create a wider angle . They are found in grassy , sandy areas and are common in Anoka , Washington , Sherburne , Benton , and Stearns counties . Various sizes of irregularly shaped , hard black sclerotia may be found inside the tan area of the stem .