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Resuelve problemas de plagas

​​En los jardines y paisajes de Oregón crecen muchas docenas de plantas. Cada tipo de planta tiene muchas plagas de insectos, enfermedades y problemas culturales (no vivos) comunes. A continuación se muestran algunas plagas de plantas comunes como ejemplos.

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Rose Problems
Mottled green and yellow leaf with black spots. The spots have diffuse edges.

 William Fountain, University of Kentucky, Bugwood.org (cropped)

Causes leaves to turn yellow and fall off. The black spots have diffuse edges.

Rose foliage with black spots before leaves yellow

Signe Danler, Oregon State University

Look for black spots forming on the leaves and stems in the spring.

Rose leaves with black spots joined along leaf veins

Signe Danler, Oregon State University

Spots may be unevenly distributed. They may follow the veins of the leaf.

Sparse leaves on rose stems

Black spot defoliates rose bushes. This bush has few leaves to create energy the bush needs to live now and in winter.

Rose Black Spot

Diplocarpon rosae

Rose black spot is a fungal disease that causes black spots on rose bush leaves and stems. It makes leaves turn yellow and fall off the rose bush. Severely infected plants often look bare with few leaves and flowers.

Rose foliage with white powdery spots

Dr Parthasarathy Seethapathy, Tamil Nadu Agricultural University, Bugwood.org

Look for white spots forming on young leaves, buds, & stems in the spring.

Rose leaves distorted by powdery mildew

Dr Parthasarathy Seethapathy, Tamil Nadu Agricultural University, Bugwood.org

Leaves and shoots are twisted or distorted. New growth is often impacted.

Rose Powdery Mildew

Podosphaera (previously Sphaerotheca) pannosa var. rosae

Powdery mildew is a fungus that causes white powdery growth on rose bush leaves and flower buds.
Infected leaves may die and drop from the plant earlier than healthy leaves.
Powdery mildew causes distorted leaf growth.
It develops during warm (not hot), dry weather. Look for it in summer in the western parts of the Pacific Northwest, and during cool, wet springs east of the mountains.

Rose foliage with purplish, angular spots

Melodie Putnam, Oregon State University

Look for irregular, purplish spots that may stop at leaf veins. Leaves may turn yellow.

Rose canes showing purplish blotches

Penn State Department of Plant Pathology & Environmental Microbiology Archives, Penn State University, Bugwood.org

Purplish blotches caused by rose downy mildew on rose cane.

Rose downy mildew spore mass on the underside of leaf

Florida Division of Plant Industry, Florida Department of Agriculture and Consumer Services, Bugwood.org

Pale, felty spore masses form on the underside of leaves. They don’t form on the upper side of leaves.

Rose Downy Mildew

Peronospora sparsa

Downy mildew is a fungus that causes purplish to dark-brown, irregular spots on leaves, stems & flowers.
Infected leaves turn yellow and drop from the plant earlier than healthy leaves.
It may cause dieback of canes.
Downy mildew develops in warm and humid conditions. In the Pacific Northwest, look for it in the spring, summer & fall when rose leaves are wet.

Orange rust pustules on underside of leaves

Jay W. Pscheidt, Oregon State University

Look for orange spots (pustules) on the lower leaf surface.

Orange pustule on rose flower bud

Orange pustules form on buds and stems.

Underside of rose leaves in winter showing black fungal structures

William M. Brown Jr., Bugwood.org

Black fungal structures develop on the undersides of rust infected leaves during the winter. These structures make spores that spread rust the following spring.

Rose Rust

Phragmidium sp.

Rose rust fungus causes orange, bumpy growth on rose bush leaves, flower buds, and stems.
Rose rust stresses the infected plant. It weakens and distorts plant growth.
Rust develops in warm and humid conditions. Look for it in late spring and early summer in the Pacific Northwest.

Rose flower petals with darker spots

Melody Putnam, Oregon State University

On rose petals, gray mold may appear as small, light-colored spots surrounded by reddish halos.

Stem with brown, sunken area and gray mold growing

Jay Pscheidt, Oregon State University

Young, green canes may develop large, sunken, dead areas.

Dead rose growing fuzzy gray mold

"Botrytis cinerea" by Flowersabc is licensed under CC BY-SA 2.0

A fuzzy, gray-brown growth develops on decaying tissues.

Botrytis (gray mold) on Roses

Botrytis cinerea

Rose gray mold (Botrytis) is a fungus that infects rose flowers and stems. Flowers may develop spots. Infected buds may fail to open. Canes may develop large, sunken, dead cankers. Dead or decaying tissue develops a fuzzy, gray-brown growth. A severe infection causes many dead, disfigured flowers and stems.

Gray mold infection is worst during cool, wet weather. Watch for it during the late fall through early spring rainy season.

Aphids on rose bud

Signe Danler, Oregon State University

Severe aphid infestations damage rose flowers.

Green rose aphid

© Ken Gray Insect Image Collection

Rose aphids range in color from green to deep pink or red-brown.

Aphids on the underside of a rose leaf

Aphids congregate on the underside of leaves.

Curled and distorted rose leaves

Severe aphid infestations cause distortion of leaves.

Rose Aphids

Macrosiphum rosae and other species

Rose aphid feeding causes distortion of leaves, flowers, and shoots. Aphids rarely kill plants. They produce honeydew: a sweet, sticky substance that promotes sooty mold growth.

Example of Other Plant Problems Content
Rhododendron leaf showing pale stippling damage

Signe Danler, Oregon State University

Azalea lace bugs suck sap, which damages leaf tissue. This causes white or yellow stippling damage on the upper leaf surface.

Azalea leaf with lace bugs and fecal material

Robin Rosetta, Oregon State University

Nymphs and fecal spots are visible on the underside of a rhododendron leaf.

Rhododendron leaves showing severe bleaching

Robin Rosetta, Oregon State University

Severe damage turns rhododendron leaves yellow.

Azalea leaves showing severe damage

Severe damage turns azalea leaves white.

Close-up of nymph

Azalea lace bug nymphs and adults feed on leaves.

Azalea Lace Bugs

Stephanitis pyrioides

Azalea lace bugs suck sap, which damages leaf tissue of azalea and rhododendron plants. This causes white or yellow stippling damage on the upper leaf surface. Nymphs and fecal spots are visible on the underside of leaves.

Gray garden slug

Cheryl Moorehead, Bugwood.org

Brown snail

Joseph Berger, Bugwood.org

Slugs & Snails

Non-native & native species in the Pacific Northwest

Slugs and snails are mollusks. Non-native slugs and snails damage plants in gardens and landscapes in the Pacific Northwest. Native slugs (such as banana slug) and snails are not considered garden pests and may be left alone.

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Insectos, babosas y enfermedades en las plantas