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List of Rose Problems and Diseases
Listed by Damage Site

THIS PAGE IS UNDER CONSTRUCTION!

Contact: Baldo Villegas at sactorose@attbi.com for any comments, questions, or corrections.

NOTE: Picture descriptions marked by an "*" do not have a corresponding pictures loaded in the server. They will be loaded as soon as the pictures can be scanned from slides.

ROOTS AND SOIL PESTS

Ants.
Nematodes.
Oakroot Fungus.
Bacterial Crown Gall.

CROWN AND BUDUNION PESTS

Earwigs.
Flat-Headed Borers.
Ants.
Canker.
Oakroot Fungus.
Bacterial Crown Gall.

STEM PESTS

Aphids.
Spittlebugs.
Leafhoppers.
Scale Insects.
Thrips.
Flat-Headed Borers.
Marmara Cambium Miners.
Caterpillars.
Stem Sawflies.
Gall Wasps.
Ants.
Cane Borers.
Spider Mites.
Slugs and Snails.
Other Animal Pests.
Powdery Mildew.
Blackspot.
Downy Mildew.
Botrytis Blight.
Canker.
Anthracnose.
Rose Spring Dwarf.

FOLIAGE AND LEAF PESTS

Aphids.
Spittlebugs.
Leafhoppers.
Scale Insects.
Thrips.
Scarab Beetles.
Fuller's Rose Weevils.
Marmara Cambium Miners.
Caterpillars.
Rose Slugs/Rose Sawflies.
Gall Wasps.
Ants.
Leafcutter Bees.
Spider Mites.
Slugs and Snails.
Other Animal Pests.
Powdery Mildew.
Blackspot.
Rust.
Downy Mildew.
Botrytis Blight.
Canker.
Anthracnose.
Rose Mosaic.
Rose Rosette.
Rose Spring Dwarf.

BUD AND GROWING TIP PESTS

Aphids.
Spittlebugs.
Leafhoppers.
Thrips.
Katydids.
Flea Beetles.
Rose Curculios (Weevils).
Caterpillars.
Stem Sawflies.
Ants.
Spider Mites.
Slugs and Snails.
Other Animal Pests.
Powdery Mildew.
Botrytis Blight.
Rose Spring Dwarf.

OPEN FLOWER PESTS

Aphids.
Thrips.
Earwigs.
Scarab Beetles.
Diabrotica Beetles.
Rose Curculios (Weevils).
Caterpillars.
Ants.
Botrytis Blight.


APHIDS

11aphid-adult.jpg: Winged Aphid.
11aphid5.jpg: Early aphid infestation on new spring growth (Photo by Bob Alde).
11aphid2.jpg: Aphid infestation on a bud.
11aphid3.jpg: Heavy aphid infestation on rose tip.
11aphid4.jpg: Aphid infestation showing cast skins and honeydew.
11aphidmummy.jpg: Aphid mummy (Photo by Bob Alde).
11sootymold.jpg: Sooty mold on leaves growing on aphid honeydew.

LEAFHOPPERS

11leafhopper.jpg: Rose Leafhopper with cast skin (Photo courtesy of Ray Gill, CDFA).
11leafhopper-dam.jpg: Rose Leafhopper leaf damage.

SPITTLEBUGS

11spittlebug-froth.jpg: Spittlebug froth on miniature roses.
11spittlebug-nymph.jpg: Spittlebug nymph out of the froth.
11spittlebug-adult.jpg: Spittlebug adult (Photo courtesy of Ray Gill, CDFA).

SCALE INSECTS

11rosescale.jpg: Rose scale on raspberry cane (Photo courtesy of Ray Gill, CDFA).
11rosescale-naked.jpg: Rose scale female uncovered and with eggs (Photo courtesy of Ray Gill, CDFA).
11sanjosescale.jpg: San Jose scale (Photo courtesy of Ray Gill, CDFA).
*Soft brown scale.
*Cottony Cushion scale.

WHITEFLIES

11iriswhitefly.jpg: Iris whitefly common on roses in central California.
11bayberrywhitefly.jpg: Bayberry whitefly on citrus from southern California.
11spiralingwhitefly.jpg: Spiraling whitefly on rose foliage in Hawaii. Note emerged pupal cases and waxy residue.
11spiralingwhitefly1.jpg: Spiraling whitefly on rose foliage in Hawaii. Note spiraling arrangement of eggs.
11spiralingwhitefly2.jpg: Spiraling whitefly on rose foliage in Hawaii. Note spiraling arrangement of eggs as well as the waxy residue.


EARWIGS

12earwig.jpg: Adult male European earwing.
12earwig-inrose.jpg: Adult female European earwing hiding in flower petals.


KATYDIDS

12katydid-adult.jpg: Katydid adult on citrus foliage.
12katydid-nymph1.jpg: Katydid nymph showing color form.
12katydid-nymph2 Katydid nymph another color form.


THRIPS

13westernflowerthrips.jpg: Western flower thrips adults and immatures.
13redbandedthrips-dam.jpg: Red-banded thrips damage to rose foliage in Hawaii. Note the silvering coloration on the upperside of the leaflets due to the thrips' feeding.
13redbandedthrips-dam2.jpg: Red-banded thrips damage to rose foliage in Hawaii. Note the silvering coloration hue on the upperside of the leaflet due to the thrips' feeding. Also note the shiny excretions unique to thrips --They feed and defecate on their feeding substrate.
13redbandedthrips-dam4.jpg: Red-banded thrips damage to rose foliage in Hawaii. Leaf #4 with diagnostic damage.
13redbandedthrips-dam5.jpg: Red-banded thrips damage to rose foliage in Hawaii. Leaf #5 with diagnostic damage.


ROSE MIDGE

14rosemidge-dam.jpg: Damage caused by rose midge larvae to flowering tips and buds of roses.
14cecidomyiid-adults.jpg: Relative size and shape of male and female midges. NOTE: These are not the adults of rose midge, but a related species.


FLEA BEETLES

No picture available at this time.

DIABROTICA BEETLES

15diabroticabeetle.jpg: Western spotted cucumber beetle from Napa, CA.
15diabroticabeetle2.jpg: Western spotted cucumber beetle from Napa, CA. Graphic way of disposing of them.
15diabroticabeetle3.jpg: Western spotted cucumber beetle from Redding, CA. Beetle among a beautiful bloom of Europeana.

SCARAB BEETLES

15japanesebeetle.jpg: Japanese beetle from New York.
15japanesebeetle-dam.jpg: Japanese beetle skeletonizing leaf.
15chineserosebeetle.jpg: Chinese rose beetles from Hawaii.
15chineserosebeetle2.jpg: Chinese rose beetles from Hawaii. Note the lack of irridescent coloration on the body.
15chineserosebeetle-dam.jpg: Chinese rose beetle damage to the foliage roses grown in a garden in Hawaii.
15chineserosebeetle-dam2.jpg: Chinese rose beetle damage to foliage in a garden in Hawaii.
15chineserosebeetle-dam3.jpg: Chinese rose beetle damage to foliage in a garden in Hawaii.
15hopliabeetle.jpg: Hoplia beetle showing some petal damage (central California).
15hopliabeetle2.jpg: Hoplia beetles from central California. Note coppery irridescent color on the underside of the body and the brown wingcovers (elytra). These scarab beetles feed on the petals of light color flowers during late April and throughout the month of May.
*Serica scarab beetle from southern California (no picture).

FLATHEADED BORERS

15flatheadedborer.jpg: Pacific flatheaded borer larva (Photo by Steve Jones).
15flatheadedborer2.jpg: Another picture of Pacific flatheaded borer larvae in the actual damaged cane (Photo by Steve Jones).

FULLER'S ROSE WEEVIL

*Fuller's rose weevil from central California.
15fullersroseweevil-dam.jpg: Fuller's rose weevil damage to edges of leaves from central California.

ROSE CURCULIOS (WEEVILS)

15roseweevil-adult.jpg: Rose curculio (weevil) from central California.
15roseweevil-adult-rg.jpg: Another picture of a rose curculio (weevil) from central California.
15roseweevil-adults.jpg: Another picture of a rose curculios (weevils) damaging rose tips and developing buds from central California.
15roseweevil-buddam.jpg: Rose weevil damage to growing tips from central California.
15roseweevil-petaldam.jpg: Rose weevil damage to the petals of an opening rose.
15roseweevil-petaldam2.jpg: Another pictures of rose weevil damage to the petals of opening flowers.
15roseweevil-squished.jpg: Picture of my favorite, non-toxic way of controlling this pest in my rose garden.


CATERPILLARS

16tobaccobudworm.jpg: Green budworm camouflaged among geranium stems & foliage.
16tobaccobudworm2.jpg: Brown budworm feeding on geranium leaf.
16tobaccobudworm3.jpg: Green budworm feeding on rose petals.
16leaftier.jpg: A leaf-rolling caterpillar from unrolled leaflet.
16leaftier-dam.jpg: A leaf-rolling caterpillar damage to rose leaves.
16leafroller-dam.jpg: Fruit-tree leafroller damage and feeding nest.
16leafroller-larva.jpg: Fruit-tree leafroller larva.
16leafroller-adult.jpg: Fruit-tree leafroller adult moth.
16leafroller-.jpg: Fruit-tree leafroller caterpillar. Graphic way of disposing of them.

MARMARA CAMBIUM MINERS

16cambiumminer-leaf.jpg: Marmara leaf cambium miner inside serpentine mines.
16cambiumminer-stem.jpg: Marmara stem cambium miner inside serpentine mines (Photo by Steve Jones, Santa Clarita, CA).


ROSESLUGS

17roseslug-bristly-bo.jpg: Bristly rose slug (Photo by Brad Oliver, Salinas, CA).
17roseslug-bristly-dam-bo.jpg: Bristly rose slug damage (Photo by Brad Oliver, Salinas, CA).
17roseslug-bristly-dam.jpg: Characteristic damage by bristly rose slugs to the underside of the leaves.
17roseslug-bristly-dam2-.jpg: Another damaged leaf with characteristic damage by bristly rose slugs.
17roseslug-euro-larva.jpg: European rose slug from central California.
17roseslug-euro-larva2.jpg: Another picture of European rose slug from central California.
17roseslug-euro-dam1.jpg: European roseslug skeletonizer damage from central California.
17roseslug-coiled1.jpg: Curled (Coiled) rose sawfly damage from central California (Lake County, CA).
17roseslug-coiled2.jpg: Picture #2 of the Curled (Coiled) rose sawfly damage from central California (Lake County, CA).
17roseslug-coiled3.jpg: Picture #3 of the curled (Coiled) rose sawfly damage from central California (Lake County, CA).

STEM SAWFLIES

1cephid.jpg: Raspberry stem sawfly.
1cephid-dam2.jpg: Raspberry stem sawfly damage. Note girdling damage to stem.
1cephid-dam3.jpg: Raspberry stem sawfly damage.

GALL WASPS

17cynipid-leafgalls.jpg: Cynipid wasp leaf galls.
17cynipid-stemgalls.jpg: Cynipid wasp stem galls.

ANTS

17ant.jpg: Ant feeding on aphid honeydew on a rose leaf.

CANE BORERS

17caneborer-dam.jpg: "Cane borer" damage to rose stem.
17caneborer-bee.jpg: Small carpenter bee boring into cane.
17caneborer-seal.jpg: Rosa Villegas applying a sealant to stems of Jean Kenneally.

LEAFCUTTER BEES

17osmialeafcutterbee.jpg: A leafcutter bee cutting the edges of a leaf (Picture courtesy of Larry Allen).
17alfalfaleafcutterbee2.jpg: Alfalfa leafcutter bee on nesting domicile from northern California.
17leafcutterbee-dam.jpg: Alfalfa leafcutter bee damage from central California.


SPIDER MITES

18twospottedspidermite.jpg: Spider mites, adults, immatures, and eggs.
18twospottedspidermite-up1.jpg: Spider mite damage to upper side of leaf #1.
18twospottedspidermite-up2.jpg: Spider mite damage to upper side of leaf #2.
18twospottedspidermite-un1.jpg: Spider mite damage to under side of leaf #1.
18twospottedspidermite-un2.jpg: Spider mite damage to under side of leaf #2.
18carminespidermite-dam.jpg: Carmine spider mite damage to rose foliage in Hawaii. Note the reddish coloration of the spider mites and the webbing on the underside of the leaf.


SLUGS AND SNAILS

19snail.jpg: Snail with egg mass.
19snail2.jpg: Snails with feeding damage.
*Snail/Slug slime on foliage (need picture).
19slug.jpg: Slug slowly moving.
19slug-hawaii.jpg: A flat slug found unded a potted rose in Hilo, Hawaii.


OTHER ANIMAL PESTS

No picture available at this time.


NEMATODES


No picture available at this time.


POWDERY MILDEW FUNGUS

21powderymildew.jpg: Powdery mildew on peduncle of bloom & leaves.
21powderymildew2.jpg: Powdery mildew on bud & leaf, notice distortion.
21powderymildew-stem-ow.jpg: Powdery mildew mycelia overwintering on pruned rose stem.
21powderymildew-inf.jpg: Severe infestation of powdery mildew.

BLACKSPOT FUNGUS

21blackspot-inf.jpg: Severe infestation of blackspot fungus on foliage. Note the yellowing of leaflets and fringed outer margins of the black spots.
21blackspot.jpg: Blackspot fungus on leaf, note yellowing of leaflets and fringed margins of black spots.
21blackspot2.jpg: Another leaf infested with blackspot fungus.
21blackspot-leaf1.jpg: Another example of bllackspot fungus on rose foliage.
21blackspot-leaf2.jpg: Another example of bllackspot fungus on rose foliage.
21blackspot-leaf3.jpg: Another example of bllackspot fungus on rose foliage.

RUST FUNGUS

21rust-un.jpg: Rust fungus spore postules on undersides of leaf.
21rust-up.jpg: Rust symptoms on uppersides of leaf.

DOWNY MILDEW

21downymildew-up1.jpg: Downy Mildew spotting on upper side of leaf. Note purple spots, angular and along veins, and chemical-like necrotic spots.
21downymildew-up2.jpg: Downy Mildew spotting on upper side of leaf, on a 2nd leaf.
21downymildew-up3.jpg: Downy Mildew spotting on upper side of leaf, on a 3rd leaf.
21downymildew-un1.jpg: Downy Mildew on underside of leaf #1.
21downymildew-un2.jpg: Downy Mildew on underside of leaf #2.
21downymildew-un3.jpg: Downy Mildew on underside of leaf #3.

BOTRYTIS BLIGHT FUNGUS

21botrytis-spots1.jpg: Spotting caused by the Botrytis spores to a rose bloom. Notice "water spots" surrounded by pink ring.
21botrytis-spots2.jpg: Close-up of "water spots" caused by spores of Botrytis blight on the petals.
21botrytis-spots3.jpg: More spotting of the petals of Minnie Pearl caused by Botrytis blight.
21botrytis-bloomrot1.jpg: Botrytis blight on rose bloom, notice brown petals.
21botrytis-bloomrot2.jpg: Botrytis blight on rotten bloom showing grey fruiting bodies.
21botrytis-bloomrot3.jpg: Botrytis blight on rotten bloom.

CANKER

21canker.jpg: Rose canker on stems of potted plant.
21canker2.jpg: Rose canker on stem
21canker3.jpg: Rose canker on stem
21canker4.jpg: Rose canker on stem
21canker5.jpg: Rose canker on stem

ANTHRACNOSE

21anthracnose.jpg: Spot anthracnose on rose leaf.
21anthracnose2.jpg: Spot anthracnose on rose leaf.
21anthracnose3.jpg: Spot anthracnose on rose leaf.
21anthracnose4.jpg: Spot anthracnose on rose leaf.
21anthracnose5.jpg: Spot anthracnose on rose leaf.
21anthracnose6.jpg: Spot anthracnose on rose leaf.

OAKROOT FUNGUS

Picture of this fungus is not available at this time.


BACTERIAL CROWN GALL

22bacterialcrowngall.jpg: Bacterial crown gall on crown of rose bush.
22bacterialcrowngall2.jpg: Bacterial crown gall on stem of rose bush.
22bacterialcrowngall.jpg: larger bacterial crown gall on stem of rose bush.


ROSE MOSAIC

23mosaicvirus1.jpg: Leaf #1 exhibiting rose mosaic virus.
23mosaicvirus2.jpg: Leaf #2 exhibiting rose mosaic virus.
23mosaicvirus3.jpg: Leaf #3 exhibiting rose mosaic virus.
23mosaicvirus4.jpg: Leaf #4 exhibiting rose mosaic virus.
23mosaicvirus5.jpg: Leaf #3 exhibiting rose mosaic virus.
23mosaicvirus6.jpg: Leaf #4 exhibiting rose mosaic virus.


ROSE ROSETTE DISEASE

23rosette1.jpg: Wild rose collected in northeastern California with rose rosette disease symptoms. The wild rose appears to be Rosa woodsii.
23rosette2.jpg: Same as above, different sample
23rosette3.jpg: Another sample of rose rosette but in a modern rose.


ROSE SPRING DWARF

23springdwarf.jpg: Rose spring dwarf disease symptoms on new foliage.
23springdwarf2.jpg: Rose spring dwarf disease symptoms on new foliage.
23springdwarf3.jpg: Rose spring dwarf disease on affected plant compared to healthy one.


If you have any questions or constructive comments, I would love to hear from you, please send e-mail to Baldo Villegas



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Copyright© 1995-2002 by Baldo Villegas
Last updated: January 20, 2002