Insect Control!
Identifying insects by the damage they do is an important first step in dealing with the problem.  Most chewing and
sucking insects such as aphid, rose chafer's, leafhopper's, etc. They are easily identified by the damage they do.  
Eradication by general insecticides is very effective.
 Always follow directions on insecticides.  After identifying the pest
choose the best control.  Some insecticides must only touch the pest to be deadly, while others must be ingested to be
effective.  Any time you can get rid of the pest with chemicals is best, but not always effective.
There are
six insecticidal general categories defined according to the way in which they affect the insect:
1.
Stomach - Is toxic and lethal when ingested by the insect.
3.
Residual - Remains toxic to insects long after application.
4.
Fumigant - Volatile enough to be inhaled by the insect in lethal doses.
5.
Repellent - Distasteful to insects making them avoid treated areas.
6.
Systemic - Absorbed by the plant system via foliage or roots which is translocated by the sap  throughout the plant.  
Causes death when the sap or plant is ingested.

Miticides are specific chemicals used to control mites and ticks.  Miticides are similar in action to insecticides.
INSECT
SYMPTOMS
CONTROL
Aphids - small green or black, may
have wings, about 1/8" long, usually
in the spring and fall.
Sticky honeydew, will make foliage
unsightly, and the mass of aphids is
unsightly.  Usually on the new
growth.
Wash the plant to knock off the
insect, most insecticides will work,
or lady bugs, lacewing larvae and
parasitic aphid wasps.
Leaf Cutting Bees - about the size of
a honey bee.
Rarely seen, but they cut sections
(circular in shape) out of the rose
foliage.
Unable to control this pest.
Grasshoppers - Longhorned or
katydids, green color.
Large irregular sections of leaf edges
removed.
Hand picking, birds, and animals
rather than spraying.
Leafhoppers - tiny hopping, 1/4" long
Small white or brown stippled areas
show on top of leaf, from sucking
on the underneath side of leaf.
Systemic insecticide, spray under
leaves.
Cane Borers - small wasps
A hole in the center of a cut cane.  
May be a few inches deep or down
to the base of cane.
Spay insecticides for aphids (source
of food) and after cutting a cane
cover the cut with elmer's glue or
shellac.
Flower Thrips - tiny, slender
brownish yellow winged insects,
hide inside the buds of roses
Damage to the petals, caused by the
thrips as they suck sap from the
petals.
Diazinon, Orthene sprayed directly on
the blooms.  The buds and top foliage
should be sprayed.
Spider Mites - two spotted spider,
prefer dry hot weather. Shake leaf
over white paper to find.
Suck sap from the leaves, Webbing
and eggs will be seen on the
underside of leaves.
Use spider mite insecticides and wash
the underside of leaves with water.
Japanese Beetles - medium sized
beautiful insect, usually seen in
clusters all over the rose.
Damage to the petals and leaves  as
they suck sap from the petals and
leaves.
Diazinon, Doom, Sevin insecticides
used to spray the soil and complete
coverage of plant.
Rose Slugs - larvae of sawflies.  
Look like caterpillars about 1/2" long
usually seen in the spring.
Leaves look see through due to
stripping of the green tissue.
Contact insecticides sprayed heavily
on foliage, top and underside.
Rose Chafer's - brownish gray
winged beetle, 1'2" long.
Suck on flowers, especially the
lighter colored roses.
Malathion, Sevin, Avid, sprayed
every 2 days.
Scale - round, hard dirty white, gray
or brown shell-covered insects.
Suck on stems and foliage causing
discoloration, wilting of foliage, and
weakening of the rose bush.
Prune out and destroy all infested
stems and leaves.  Apply Malathion,
Sevin or Orthene.
Oklahoma Rose Society