Affecting Roses

Aphids
Aphid
Description:
Pear-shaped, soft bodied insects; can we winged or wingless. Most commonly green but can be black, dark brown, yellow, white, bronze, red or pink.

 

Damage:
Suck sap while feeding on leaves, stems or roots. Can be found on growing tips, undersides of leaves, along stems and in roots.

 

Signs
Reduction in plant vigour; wilting and distortion of plant tissue - curled, puckered or distorted growth. Excrete honeydew, a sticky fluid that can lead to sooty mold development and also attracts ants, wasps and other flies. In some cases can cause red blistering on leaves.

 

What it attacks
All herbaceous and woody ornamentals

^ Back to Top

Cane Borers
James Solomon, USDA Forest Service, Bugwood.org
Description:
Larvae from various insects.

 

Damage:
Larvae bore into the sapwood of the tree disrupting the nutrient and water flow of the tree.

 

Signs
Holes in the bark, sawdust in holes or at the base of the plant, wilting, stunted growth, bud drop and die back.

 

What it attacks
Rose

Back to Top

Leaf Cutter Bee
Joseph Berger, Bugwood.org
Description:
Small to medium sized bee

 

Damage:
Uses pieces of leaves to line egg cells in the hive.

 

Signs
Perfect round to oblong shaped holes appear on leaves. Cosmetic pest; Leaf cutter bees are valuable pollinators.

 

What it attacks:
Rose, lilac, ash, Virginia creeper

Back to Top

Pear Slug
Pear Slug
Description:
small olive-green to black, slimy, slug-like larvae

 

Damage:
feed on upper and lower surfaces of the leaves, skeletonize leaves

 

Signs
leaves are chewed between the veins, leaving a lacy translucent layer of tissue that turns brown

 

What it attacks:
Pear, Rose and other plants in the Rose family, Oak

Back to Top

Rose Curculio
Whitney Cranshaw, Colorado State University, Bugwood.org
Description:
Bright red beetles with a long snout; larvae are white legless maggots.

 

Damage:
Adults puncture holes in the flower buds to feed on the pollen. Flowers have a ragged appearance with holes in the petals. Will also feed on the tips of new growth causing stem distortion and dieback.

 

Signs
Flowers fail to open, small holes in buds. Affects flowering not necessarily the overall health of the shrub.

 

What it attacks:
Rose

Back to Top

Rose Gall Wasp
Björn Appel, commons.wikimedia.org
Description:
Small reddish wasp, larvae white-yellow with a brown head.

 

Damage:
Wasps deposit eggs in young leaf buds in the spring, this causes the formation of galls which contain cells with eggs. Eggs start to hatch into larvae and the galls grow and swell.

 

Signs
Round ball-shaped galls appear on stems, that are covered with mossy green and red filaments.

 

What it attacks:
Roses

Back to Top

Spider mites
Spider mites
Description:
Tiny rounded eight-legged insect.

 

Damage:
Puncture leaf and suck out both water and food producing green chlorophyll.

 

Signs
Leaves become speckled with yellow blotches; stippling and dotting on leaves; leaves may fall prematurely; fine webbing on leaves, in leaf crotches or on flower buds; reduces vigour.

 

What it attacks:
All ornamentals

Back to Top

Thrips
Pennsylvania Department of Conservation and Natural Resources - Forestry Archive, Bugwood.org
Description:
Tiny, slender pale yellow, green or brown insects.

 

Damage:
Pierce plant cells and suck out the contents.

 

Signs
Injured tissue dies producing dead spots, distorted blooms and leaves, and balled flowers.

 

What it attacks:
Most ornamentals

Back to Top