Tree Photos

Are wild crab apples a reservoir for fire blight whilst showing no signs of disease?

Peasgood Nonsuch looking good so far

Victoria Plum cut back last year after FB infection

Seven year old tree with no blossom

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I don’t think so. If the crab were infected to the degree it was releasing contaminants you’d see signs.

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I read the fireblight causes cankers which are part of the life cycle of this bacterial. Something like this.

  1. Cankers ooze sweet liquid filled with FB bacteria
  2. Insects visit the sweet liquid and makes the FB bacteria mobile
  3. Insects then visit flowers (or injured tissue) and deposits the FB bacteria.
  4. FB infects new host and causes cankers.