I have aold beech hedge for the last 25 yrs, continuously kept at 5ft. I cut it once a yr. in the last few yrs, there has been poorer and poorer growth and less cutting on it and on the underside of the leaf there are masses of white aphids. I also spray the undergrowth to keep the weeds away. Is the hedge not foing well because i am not letting it grow wild or is it the aphids that are casuing the problem?
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