Since you know of nothing that will help why not try the diluted bleach spray. Wet the stem that is affected and the soil immediately around the infected area. If you see no harm then do it again a day or two later and then wait and see if it helps. It is my go to method of working with unknown or so called incurable diseases and it works sometimes on some particularly hard to treat diseases as long as they are not too far along. Mix around 5 1/2 oz of standard 6% sodium hypochlorite bleach in a gallon of water with a dab of dish washing soap. You can make it a bit stronger for really hard to treat problems.
Bill
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