noun
needle blight
A plant disease, especially of conifers, causing needles to turn reddish-brown and die. Technical term used in botany and forestry.
松の木が赤枯れ病にかかって、葉が茶色くなった。
The pine tree got needle blight, and its needles turned brown.
Compound of 赤枯れ (akagare, 'red withering') + 病 (byō, 'disease'). The exact derivation is uncertain; the name describes the reddish discoloration of affected foliage.