Bacterial canker

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Other names: Bacterial blast

DE: Bakterienbrand

FR: Feu bactérien

Contents

Relevant Data About Bacterial Kanker

Bacterial kanker is caused by the Pseudomonas mors prunorum bacteria. The bacteria penetrates into the bark and leaves through wounds in the autumn or the spring. The symptoms appear in the spring or the early summer. Cherry trees are particularly susceptible to bacterial kanker, but it can affect other fruit trees like apricot, prune, and peach trees. Especially young trees are likely to be contaminated.

Harm Caused by Bacterial Kanker

BacterialKanker spot.jpg Small brown spots with a dark border that detaches itself from the leave spread on the foliage.
BacterialKanker gum.jpg An amber-yellow gum oozes from lesions in the bark.

Biological Control

General and preventive measures

  • Bark lacerations due to frost are the entry gate to bacteria, therefore:
    • Prefer to cultivate fruit tree species that are well-adapted to the conditions of the region you leave in, especially in regard to soil nutritional conditions and climate. Bark lacerations due to frost are the entry gate to bacteria.
    • Protect your trees against frost e.g. enveloping the trunk with a coconut mat for the winter.
    • Care for an appropriate soil conditions in your garden. Especially, potash in an essential element for building up plant cell walls and to ensure the plant's efficient water management that will make your trees more resistant to frost.
  • Cut off the oozing parts of the bark deep into the wood, burn the cut-off wood, close the wounds with appropriate material, e.g. a loam coat.

Self-Made Receipes

  • Apply a loam coat on the trunk at the end of the winter (February-March).

Commercial products

  • Spray a leave fertilizer, such as Horsetail Concentrate, added with some essential oil with an antiseptic effect (e.g. lavender, clove, rosemary and thyme) on the leaves and the bark.



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