Why does my mandarine tree has black powder on the branches and trunk

my mandarine tree has black powder on branches and trunk. Want to save it. What soil/food is needed for tree.

yates

10 August 2014 02:45 PM

Sooty Mould inhabits leaves and branches of trees attacked by sap sucking insects exuding honeydew. Most commonly this insect is scale so, when the insect is controlled, there is no food source for the Sooty Mould. Remove the scale and Sooty Mould from the tree with a soft toothbrush dipped in soapy water then follow up with a spray of Yates Scale Gun.(but not in late autumn or winter) Repeat the spray after 4 weeks if necessary.

Topics: Fruit and Citrus Issues: Diseases