Spruce: Oil discoloration of foliage
Spruce: Oil discoloration of foliage categories: Conifers Ornamentals Spruce Spruce Diseases revision date: 2023-02-07 12:00 Discoloration on older foliage from oil applicationPhoto by: R. Maleike Biology Oil discoloration of spruce foliage is suspected when trees which normally have blue-green needles instead have bright green needles. Use of spray oils (to control insects, for instance) can […]