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Rose
Pests
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Roses host a variety of noxious pests
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Summary: Roses can
be difficult to grow because of the many insect
pests and diseases that plague this garden
favorite. Aphids and several leaf-feeding beetles
can be the most damaging but fortunately there are
now relatively low toxicity solutions to these
pests.
Jack DeAngelis, PhD
OSU Ext. Entomologist
(ret.)
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Aphids & black spot fungus on
rose
Roses are host to a wide range
of insect and disease pests but
for most gardeners aphids and black
spot leaf fungus will be your main
concerns. Another fungus, powdery mildew,
can become a problem for some roses, in some
years as well. The very
best treatment to control aphids is
overhead watering combined with insecticidal
soap (see Using
Insecticidal Soap to Control Spider Mites
and Aphids). Soap works great and is
non-toxic to you and to beneficial insects and
mites.
Be sure to limit overhead watering to
times when the leaves can dry before dark
otherwise wet leaves can become infected with
fungal diseases. Insecticidal soap can be used
following watering to control spider mites and
aphids.
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Peace Rose,
Photo by Elizabeth DeAngelis
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Japanese beetles and roses
In some regions, including the eastern US,
Japanese beetle and rose chafer are severe
pests of roses (see Related Articles below).
Adult beetles can do significant damage to foliage
and flowers if left untreated. Adults emerge in
early summer and immediately start to feed on a wide
range to host plants but rose is one of their
favorites.
Many rose gardeners combine hand-picking
with a foliar (leaf) spray of insecticide when
beetles are present. A good choice for an
insecticide in this situation is EcoPCO WPX
(see below). As a wettable powder EcoPCO WPX is easy
to apply with a garden sprayer, relatively low
toxicity and easy on beneficial insects and mites at
least compared to conventional insecticides.
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Insecticides and traps
Japanese beetle (Popillia japonica)
can be a severe pest of roses but this beetle does
not occur in all regions. Check with your county
Extension office or garden center for local
information about this pest. If Japanese beetle
does occur in your area use traps to detect when
adults emerge and then treat foliage to prevent
feeding injury. Also, be sure to check the article
below for other ways to control this pest.
New botanical
insecticides like EcoPCO WPX can be
safely used for Japanese beetle control on roses.
See label instructions for this application and
please read and carefully follow these
instructions. Apply when beetles start
feeding in early summer or when your traps start to collect
beetles. Re-apply as necessary. Hand-picking beetles
into soapy water also is effective.
What are
Japanese Beetles?
Managing Aphids on
Garden Plants
Managing Spider
Mites on Garden Plants
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