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Problem Solver Plant Marquee

Plant:

Rose
Image of Rose
Flowering
Spring and summer (through fall in the South).
Adaptation
Throughout the United States.
Pruning
Remove dead or unhealthy wood. Remove branches that cross through the center of the plant. Prune off at least a third to half of last year''s growth.
Soil
Any good, well-drained garden soil.
Water
Roses need plenty of water. Water when the soil is moist but not wet.
Fertilizer
Fertilize with plant food for flowers.
Light
Full sun. Plant in areas with good air-circulation.
Related problems

Beetles - Rosa (Rose)

Image of Beetles - Rosa (Rose)
Beetles

Black Spot -

Image of Black Spot
Black Spot

Powdery Mildew - Rose

Image of Powdery Mildew - Rose
Powdery Mildew

Rose aphid -

Image of Rose aphid
Rose aphid

Rust - Rose

Image of Rust - Rose
Rust

Spider Mites - Rose

Image of Spider Mites - Rose
Spider Mites
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Beetles - Rosa (Rose)

Image of Beetles - Rosa (Rose)
Beetles
Description
Holes appear in the flowers and flower buds. open flowers may be entirely eaten. Often, affected buds fail to open, or open deformed. Stem tips may be chewed, and the leaves be notched or riddled with holes. Red, green-spotted, brownish, or metallic green beetles up to 1/2 inch long are sometimes seen on the flowers or foliage.
Analysis

Several different beetles infest roses. They may destroy the ornamental value of the plant by seriously damaging the flowers and foliage. The insects usually spend the winter as larvae in the soil or as adults in plant debris on the ground. In late spring or summer, mature beetles fly to roses and feed on the flowers, buds, and sometimes leaves. Punctured flower buds usually fail to open, and flowers that do open are often devoured. Many beetles feed at night, so their damage may be all that is noticed. Female beetles lay their eggs in the soil or in flowers in late summer or fall. The emerging larvae crawl down into the soil to spend the winter, or they mature and pass the winter as adults. The larvae of some beetles feed on plant roots before maturing in the fall or spring.

Solution

Apply an insecticide labeled for this pest, following label directions.

Close

Black Spot -

Image of Black Spot
Black Spot
Description
Circular black spots with fringed margins appear on the upper surfaces of the leaves in the spring. The tissue around the spots or the entire leaf may turn yellow, and the infected leaves may drop prematurely. Severely infected plants may lose all of their leaves by midsummer. Flower production is often reduced, and quality is poor.
Analysis

Black spot is caused by a fungus (Diplocarpon rosae) that is a severe problem in areas where high humidity or rain is common in spring and summer. The fungus spends the winter on infected leaves and canes. The spores are spread from plant to plant by splashing water and rain. The fungus enters the tissue, forming spots the size of a pinhead. The black spots enlarge, up to 3/4 inch in diameter, as the fungus spreads; spots may join to form blotches. Twigs may also be infected. Plants are often killed by repeated infection.

Solution

Apply a fungicide labeled for this disease, following label directions. Avoid overhead watering. In the fall, rake up and destroy the fallen leaves.

Related Products
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Ortho® MAX® Garden Disease Control Concentrate

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Powdery Mildew - Rose

Image of Powdery Mildew - Rose
Powdery Mildew
Description
Young leaves, young twigs, and flower buds are covered with a thin layer of grayish white powdery material. Infected leaves may be distorted and curled, and many may turn yellow or purplish and drop off. New growth is often stunted, and young canes may be killed. Badly infected flower buds do not open properly. In late summer, tiny black dots spore-producing bodies) may be scattered over the powdery covering like ground pepper.
Analysis

This common plant disease is caused by a fungus (Sphaerotheca pannosa var. rosae). It is one of the most widespread and serious diseases of roses. The powdery covering consists of fungal strands and spores. The spores are spread by the wind to healthy plants. The fungus saps plant nutrients, causing distortion, discoloration, and often death of the leaves and canes. Powdery mildew may occur on roses any time during the growing season when rainfall is low or absent, temperatures are between 70&deg; and 80&deg;F, nighttime relative humidity is high, and daytime relative humidity is low. In areas where there is high rainfall in spring and summer, control may not be needed until the drier months of late summer. Rose varieties differ in their susceptibility to powdery mildew.

Solution

Apply a fungicide labeled for this disease, following label directions. Rake up and destroy leaves in the fall.

Close

Rose aphid -

Image of Rose aphid
Rose aphid
Description
Tiny, green or pink, soft-bodied insects cluster on leaves, stems, and developing buds. When the insects are numerous, flower buds are usually deformed and may fail to open properly. A shiny, sticky substance often coats the leaves. A black sooty mold may grow on the sticky substance. Ants may be present.
Analysis

Macrosiphum rosae Rose aphids do little damage in small numbers. Plants can tolerate fairly high populations without much effect. The aphids are extremely prolific, however, and populations can rapidly build up to damaging numbers during the growing season. Damage occurs when the aphid sucks the juices from the rose stems and buds. The aphid is unable to digest fully all the sugar in the plant sap and excretes the excess in a fluid called honeydew, which often drops onto the leaves below. A sooty mold fungus may develop on the honeydew, causing the rose plants to appear black and dirty. Ants feed on the sticky substance and are often present where there is an aphid infestation. When aphid populations are high, flower quality and quantity are reduced.

Solution

Apply an insecticide labeled for this pest, following label directions.

Close

Rust - Rose

Image of Rust - Rose
Rust
Description
Yellow to brown spots appear on the upper surfaces of leaves, starting in the spring or late fall. On the undersides of leaves are spots or blotches containing a red, orange, or black powdery material that can be scraped off. Infected leaves may become twisted and dry and drop off the plant. Twigs may also be infected. Severely infected plants lack vigor.
Analysis

Rose rust is caused by any of several species of fungi (Phragmidium species) that infest only rose plants. Rose varieties differ in their susceptibility to rust. Wind spreads the orange fungal spores to rose leaves. With moisture (rain, dew, or fog) and moderate temperatures (55&deg; to 75&deg;F), the spores enter the tissue on the undersides of leaves. Spots develop directly above, on the upper surfaces. In the fall, black spores develop in the spots. These spores can survive the winter on dead leaves. In spring, the fungus produces the spores that cause new infections. Rust may also infect and damage young twigs.

Solution

At the first sign of rust, pick off and destroy the infected leaves and apply a fungicide labeled for this disease, following label directions. Rake up and destroy infected leaves in the fall. Prune off and destroy infected twigs. Plant resistant varieties.

Close

Spider Mites - Rose

Image of Spider Mites - Rose
Spider Mites
Description
Leaves are spotted (stippled), bronzed, and dirty. A silken webbing may be on the lower surfaces of the leaves or on new growth. Infested leaves often turn brown, curl, and drop off. New leaves may be distorted. Plants are usually weak. To check for spider mites, hold a sheet of white paper underneath an affected leaf and tap the leaf sharply. Minute specks the size of pepper grains will drop to the paper and begin to crawl around.
Analysis

These mites, related to spiders, are major pests of many garden and greenhouse plants. They cause damage by sucking sap from the undersides of leaves. As a result of their feeding, the plant''s green leaf pigment disappears, producing the stippled appearance. Spider mite webbing traps cast-off skins and debris, making the plant messy. Many leaves may drop off. Severely infested plants produce few flowers. Mites are active throughout the growing season but are favored by hot, dry weather (70&deg;F and up). By midsummer, they have built up to tremendous numbers.

Solution

Apply an insecticide labeled for this pest, following label directions.

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