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Category: Gardening - Plant Doctor - Black Sooty Mould
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Black
Sooty Mould
Symptoms
Leaves become covered with a black or greenish mould layer.
Cause
A fungus which colonises honeydew , a sticky substance secreted
by sap-sucking insects such as aphids, scale, mealy bugs and whitefly.
Harm
If the infestation is very heavy then light and air is prevented
from reaching the leaves. These are essential elements needed for
plants to make their own food.
Treatment
Sooty mould can be wiped from large tough leaves using soapy water.
Otherwise, there is no direct control for sooty mould, so you have
to deal with the pest that is secreting the honey dew, which is
usually scale insects.
Source:
Crocus
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