A helicopter was drafted in to spray bracken on Ilkley Moor last week in the latest effort to keep the plants at bay.
More than 75 acres of land on the lower slopes of the moor, the most popular area for visitors and dog walkers, was sprayed with herbicide Asulam on Friday.
Supporters group The Friends of Ilkley Moor recently set aside £10,000 to pay for the treatment, which it is hoped will prevent bracken taking over large areas of the landscape.
Friends chairman John Stidworthy said: “We are hoping that the chemical will destroy a large area of bracken and that the money will be well spent by the Friends. We will not know for sure until next year when the bracken comes up – or, we hope, does not.”
Areas of the moor sprayed included land north of White Wells Cottage, land to the west of Spicey Gill, and land close to the Cow and Calf Rocks.
The chemical is said to be harmless to humans and to plant life on the Moor other than bracken and ferns.
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