I have some 40 different pyracanthas in my garden of 4 or 5 varieties trained against walls, and all are doing very well. Except, that is, one which is next to our front door. Late last year one part of the plant (which grows around a window, and is stopped at about ten feet high, started to look a little sad. It has now lost most of its leaves and looks to be dieing. Another shoot of the same plant, on the left of the window, is green and vigorous. There does,m however, appear to be some sign of green leaves at the top of the "dead-looking" part. I can't see any sign of scab, but last year it was full of green aphids.
Is it worth leaving it to see what happens?
Should I spray it, or must I cut it out and wait for the left hand part to throw a shoot that I can train up the right side? At worst, must I get rid of the whole plant which covers a patch about 15 feet by 12 ft of the wall around a window?
