HOST PLANTS: Blue Colorado Spruce is the primary host. Norway Spruce is resistant. Other spruces and pines are infrequently attacked. DAMAGE: Symptoms of needlecast appear between early spring and early summer when needles infected the previous season turn purple or...
HOST PLANTS:Boxwood Buxus spp. DAMAGE:Female flies puncture foliage creating a small yellow hole on the underside of leaves to lay eggs. Larvae mine leaves by feeding on the mesophyll layer, forming a blister on the surface of foliage and often discoloration. The...
PEAR TRELLIS RUST HOST PLANTS: Ornamental and fruit bearing Pear trees. Alternate hosts Junipers and Cypress. DAMAGE:The disease is easily detected on pear leaves which become covered with orange spots in early summer and grey, fuzzy growth in the fall. It is usually...
