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It is most likely not sap but the excretion from Aphids (Greenfly). They suck the sap from the tree and then excrete this sticky substance, often called Honeydew. It may be worth contacting the te...
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It is most likely not sap but the excretion from Aphids (Greenfly). They suck the sap from the tree and then excrete this sticky substance, often called Honeydew. It may be worth contacting the te...