Dark Mark Used by Pirates in Treasure Island

This page is the CodyCross answer for the clue below from Brazilian Tour, Group 765, Puzzle 3 (Coffee Exporter).

Question is: Dark Mark Used by Pirates in Treasure Island

and the answer is: BLACKSPOT

Word Meaning:

BLACK SPOT — (phytopathology, uncountable) A fungal disease among plants, particularly roses, that results in black spots on the leaves.

Definitions from Wiktionary.