Lars, I would have to say Erwinia, also, as this devastated my Phals this past summer; I must have lost 30 to 40 plants to crown rot or just DEAD! As has been said previously it can rapidly destroy a plant. I tried Phyton 27 with NO effect! I sprayed Physan-20 mixed 1 1/2 times stronger than directed and sprayed EVERYWHERE! This slowed things down but you have to do it frequently. Removing affected parts is paramount. Using cinnamon seemed to work well. If you can find agricultural Streptmycin, this is the gold standard. Erwinia, not to get too scientific, is a gram negative bacteria and the Steptomycin is very effective in killing this type of organism. Also, Cipro which is readily available and cheap should work also, since it is very active against gram negative bacteria. Cipro is very soluble in water, especially if the water is warmed to about 120F (50C), then spray it everywhere. You may have to repeat the Physan or Cipro routine. Sorry to hear about your situation. I know also you have adequate air circulation because moisture promotes the growth of the bacteria. And like other types of infections, general spraying with water spreads the nasty stuff.
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