Aphids & Adelgids

Question 1

Cooley Spruce Gall Adelgid

Answer 1

2-4 inch cucumber shaped growths, little to no harm; require two hosts spruce and douglasfir, if galls have formed insecticides are ineffective - spray times spring before new growth or fall when overwintering stages have returned to the tree

Question 2

Cooley Spruce Gall Adelgid Insecticides

Answer 2

carbaryl (SEVIN), hort oil, imidacloprid (MERIT), insecticidal soaps, permethrin (ASTRO)

Question 3

Eastern Spruce Gall Adelgid

Answer 3

key pest of Norway Spruce, occasionally white, red or blue, very small pineapple shaped growths, feed on current year’s growth, severely effect aesthetics

Question 4

Eastern Spruce Gall Adelgid Control

Answer 4

pruning galls by hand in June or July before they open, horticultural oil as a dormant treatment (BE ADVISED HORT OIL REMOVES BLUE COLORATION FROM SPRUCES), additional insecticides are effective from mid-Sept through early Oct

Question 5

Hemlock Woolly Adelgid

Answer 5

invasive & aphid like, form woolly masses on the underside of branches at the base of the needles, severely damages the canopy; mortality can occur within 4-10 years. effects all species of Hemlock

Question 6

Hemlock Woolly Adelgid Control

Answer 6

some biological insect control is being studied, insecticides used in an ornamental setting. two insecticides can be used Imidacloprid and Dinotefuran - separately or together for increased effectiveness

Question 7

Pine Bark Aphid

Answer 7

native insect, principle host eastern white pine sometimes scots or austrians, creates characteristic threads of cottony white material. short legged, black teardrop shaped insects. suck sap from phloem, damage under heavy infestation

Question 8

Pine Bark Aphid Life Cycle

Answer 8

immature adelgids overwinter, wake in the spring, develop into adults April / May and lay eggs. crawlers move throughout host or are blown to additional trees. Settle, feed and mature into winged or wingless adelgids. up to five generations in a season

Question 9

Pine Bark Adelgid Control

Answer 9

only when tree is in decline; horticultural oil can be applied in the dormant season before new growth, Imidacloprid (MERIT) as a systemic

Question 10

Woolly Beech Aphid

Answer 10

affects all beech trees and hedges, pale yellow sap sucking aphids with white fluff, underside of leaves / honeydew present and sooty mold as well. generally not harmful to the plant