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These chemicals will kill the beetles present at the time of application , but may not prevent additional rose chafers from attempting to feed on treated plants . By this we mean that , within a given pixel , the position of radar scatterers has not changed to any significant degree , but the ensemble of scatterers ( i.e ., the entire ground surface within that pixel , as well as some adjacent ones ) has moved up , down , or sideways in some correlated fashion . Avoid pulling or yanking the fruit , as you could pull off the spur , taking with it next year 's flower buds . You can also do a sketch or simple drawing of what new perennials you planted . Some varieties are resistant to apple scab ; see Table 1 . At the other end of the fruitfulness spectrum , some varieties are " pollen sterile , " meaning they do not have the ability to pollinate another tree .