The Black Knot of The Cherry and Plum Tree

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The Black Knot of The Cherry and Plum Tree
By Alana, Eric, Steph, and Lindsey
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The Range

• Black knot disease is commonly found in the
  orchard fields of the United States. The disease
  seems to spread because with cherry and plum
  trees they dont use sprays. The Black knot
  disease is also know for infecting European,
  Japanese, and American varieties.

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Description

• The Black knot disease develops from fungus
  Apiosporina morbosa. It can effect black
  cherries, chokecherries and plum trees. The
  disease infects rough dark areas of the tree, and
  once it has spread it kills the effected parts
  and it now allows a new habitat for insects.

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Life Cycle

• The black knot disease are most common in the
  spring because the disease is either wind or rain
  blown. The infection can spread from the green
  cluster stage and starts to seas at the beginning
  of June. After the infection takes place it
  starts to brown in the same place, the swell and
  eventually produces spores. This is when fruiting
  bodies develop along the surface of the knot.

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Host plant And Transmission

• The three host plants are the black cherry,
  cherry, plum and prune trees.The transmission of
  the disease is by birds and wind currents.

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Prevention and control

• The disease tends to spread faster in warm and
  wet weather. A way you could prevent the disease
  from spreading is that you could prune and trim
  the infected twigs and branches during the fall
  and winter season. For this they say you should
  cut at least 10cm off where there were visible
  signs of infection. There are two more ways that
  you can control the disease this is buy using
  lime sulfur and garden sulfur.