Aphid

Crops
attacked

Overwintering stage

Aphid color

Number of generations

Location

First nymphs present

Apple grain aphid

Apple, plum, pear

Eggs on tree

Dark green when young nymph; lighter green with dark green stripe down back when full grown

3 on apple; many on summer host plants

At tip of opening buds early; later on undersides of leaves

Green tip

Rosy apple aphid

Apple
Pear

Eggs on tree

Dark purple when young nymph; purple to pinkish when full grown

3 on apple; many on summer host plants

Almost exclusively in curled leaves of spur growth

½ - inch green-cluster bud

Apple aphid

Apple
Pear

Eggs on tree

Dark green when young nymph; yellowish green to light green when full grown

4-6 on apple or pear

Colonies at tips of growing terminals or suckers

½-inch green-cluster bud

Woolly apple aphid

Apple
Pear

Nymphs in subterranean colonies or eggs on elm trees

Reddish brown to purple; covered with white cotton-like substances

Number variable, usually 3-4 on apple

Colonies at the bases of suckers or on pruning scars

Mid-summer (variable)

Black cherry aphid

Cherry

Eggs on tree

Shiny black

2-3 on cherry; many on summer host plants

Colonies at tips of growing shoots

As leaves begin to appear in spring

Green peach aphid

Peach
Nectarine

Eggs on tree

Green as young nymph, turning a straw to light green when older

3 on apple and peach; many on summer host plants

At opening buds and leaves of spurs

As leaves begin to appear in spring