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gardengeek
gardengeek
Purple Leaf Blister - Plant Disease
  Purple Leaf Blister - Plant Disease May 18, 2009
Purple Leaf Blister - Plant Disease
32

9207
gardengeek
gardengeek
Red Blister Plant Disease
  Red Blister Plant Disease May 15, 2009
Cedar Apple Rust - Gymnosporangium juniperi-virginianae Red Blister Plant Disease
33

13891
gardengeek
gardengeek
Red Blister Leaf Disease
  Red Blister Leaf Disease May 15, 2009
Maybe Plum leaf blister (Polystigma rubrum) - Red leaf spots Red Blister Leaf Disease
34

6978
gardengeek
gardengeek
Unknown Plant Disease
  Unknown Plant Disease May 03, 2009
http://www.forestryimages.org/search/action.cfm?q=symptoms&a
mp;Start=1&results=4440
Unknown Plant Disease
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4069
Leslie
Leslie
Clubroot
  Clubroot May 03, 2009
Clubroot is a common disease of cabbages, radishes, turnips and other plants belonging to the family Cruciferae (mustard family). It is caused by Plasmodiophora brassicae, which was once considered a slime mold but is now put in the group Phytomyxea. It has as many as nine races. Gall formation or distortion takes place on latent roots and gives the shape of a club or spindle. In the cabbage such attacks on the roots cause undeveloped heads or a failure to head at all, followed often by decline Clubroot
36

6061
Jenny_Smith
Jenny_Smith
Corn smut
  Corn smut May 03, 2009
Corn smut is a disease of maize caused by the pathogenic plant fungus Ustilago maydis. In Mexico corn smut is called huitlacoche, sometimes spelled cuitlacoche), a Nahuatl word reportedly meaning raven's excrement. It is considered a delicacy, even being preserved and sold for a higher price than corn. For culinary use, the galls are harvested while still immature fully mature galls are dry and almost entirely spore-filled. The immature galls, gathered two to three weeks after an e Corn smut
37

9371
genny_happy
genny_happy
Early blight
  Early blight April 24, 2009
Alternaria solani is a fungal pathogen, producing a disease in tomato and potato plants called early blight. It produces small, darkened lesions on the plants, that spread into growing black spots of dead tissue, often killing most of the plant in the long run. Seeds infected with the disease may even damp off during germination. This disease can be prevented with some fungicides, including azoxystrobin, potassium bicarbonate, hydrogen dioxide as well as the biological control agent Bacillus Early blight
38

11747
heidbenati
heidbenati
White rot root disease - Honey fungus or Armillaria
  White rot root disease - Honey fungus or Armillaria April 23, 2009
Honey fungus or Armillaria is a genus of parasitic fungi that live on trees and woody shrubs. It includes about 10 species formerly lumped together as A. mellea. Armillaria is long lived and form some of the largest living organisms in the world. The largest single organism (of the species Armillaria ostoyae) covers more than 3.4 square miles (8.9 km²) and is thousands of years old. Some species of Armillaria are bioluminescent and may be responsible for the phenomena known as foxfire and White rot root disease - Honey fungus or Armillaria
39

20319
heidbenati
heidbenati
Powdery mildew
  Powdery mildew April 23, 2009
Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of fungi in the order Erysiphales. It is one of the easier diseases to spot, as its symptoms are quite distinctive. Infected plants display white powder-like spots on the leaves and stems. The lower leaves are the most affected, but the mildew can appear on any part of the plant that shows above the ground. As the disease progresses, the spots get larger and thick Powdery mildew
40

3186
gardengeek
gardengeek
Elm Disease
  Elm Disease April 23, 2009
Elm Disease
41

41419
gardengeek
gardengeek
Tobacco Mosaic Virus
  Tobacco Mosaic Virus March 26, 2009
When Tobacco Mosaic Virus infects a tobacco plant, the virus enters mechanically (For example through a ruptured plant cell wall) and replicates. After its multiplication, it enters the neighboring cells through plasmodesmata. For its smooth entry, Tobacco Mosaic Virus produces a 30,000 dalton protein called P30 which tends to enlarge the plasmodesmata. TMV most likely moves from cell-to-cell as a complex of the RNA, P30, and replicase proteins. The first symptom of this virus disea Tobacco Mosaic Virus
42

3606
Jenny_Smith
Jenny_Smith
Brown Patch
  Brown Patch March 18, 2009
Rhizoctonia solani (teleomorph: Thanatephorus cucumeris) is a plant pathogenic fungus with a wide host range and worldwide distribution. It is one cause of the condition known as damping off, which is a cause of death of seedlings in agriculture. It is also responsible for wire stem, a disease of cabbage, cauliflower and related plants that is similar to damping-off but attacks older seedlings and produces a constricted, wiry stem. The most favorable conditions for disease development usua Brown Patch
43

4443
Jenny_Smith
Jenny_Smith
 Dollar Spot
  Dollar Spot March 18, 2009
The disease is caused by the fungus Sclerotinia homoeocarpa. Susceptible turfgrass include: all species of warm- and cool-season turfgrass. Tall fescues, Bentgrass, Zoysiagrass and Bermuda hybrids are particularly susceptible. Dollar spot is favored by temperatures between 60F to 85F and continuous high humidity and low soil moisture. This disease is particularly favored by warm days, cool nights, and intense dews. It also infects areas with low levels of nitrogen and becomes more severe in  Dollar Spot
44

3593
Jenny_Smith
Jenny_Smith
Dogwood anthracnose
  Dogwood anthracnose March 18, 2009
Dogwood anthracnose is caused by the fungus Discula. Brown, elliptical cankers may form at the base of dead branches. Drought, winter injury, and environmental stress predispose dogwood to anthracnose. Kousa dogwood (Cornus kousa) is resistant to this disease. Dogwood anthracnose
45

7911
Jenny_Smith
Jenny_Smith
Fireblight
  Fireblight March 18, 2009
Fireblight is a destructive, highly infectious and widespread disease caused by the bacterium Erwinia amylovora.The disease affects plants in the Rosaceae family: Malus (apple and crabapple), Cotoneaster (cotoneaster), Prunus (flowering almond, plum and cherry), Chaenomeles (flowering quince), Crataegus (hawthorn), Eriobotrya (loquat), Sorbus (mountain ash), Photinia (photinia), Pyracantha (pyracantha) Rosa (rose), Amelanchier (serviceberry), Spirea (spirea) among others. The bacterium spend Fireblight
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3654
Jenny_Smith
Jenny_Smith
Cedar-Apple and Quince Rusts
  Cedar-Apple and Quince Rusts March 18, 2009
Cedar-apple rust and quince rust affect two groups of vastly utilized landscape plants. The cedar-apple rust fungus overwinters in galls that may grow to several inches in diameter on eastern red cedar and several other junipers. In the spring, brightly-colored, gelatinous horns emerge from the galls during wet weather. These horns consist of masses of spores that are spread by wind to newly-emerging apple, crabapple, and hawthorn leaves and fruit. By mid-summer, rusty or orange-colored spots ap Cedar-Apple and Quince Rusts
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6643
Jenny_Smith
Jenny_Smith
Camellia Leaf Gall
  Camellia Leaf Gall March 18, 2009
The disease is caused by the fungus Exobasidium camelliae. The severity of the disease varies according to the weather conditions when leaf expansion begins in the spring. Cool, moist weather favors disease development. Frequently overhead sprinkler irrigation provides the moisture necessary for disease development. The fungus survives during the winter in leaf buds and infects the developing leaf tissue. Instead of developing normally, the new leaves become thickened and succulent and may b Camellia Leaf Gall
48

6507
Jenny_Smith
Jenny_Smith
Disease of Coneflower
  Disease of Coneflower March 17, 2009
Coneflowers may get Pseudomanas or Xanthomonas leaf spot. Powdery mildew will also occur under the right weather conditions. Botrytis may also occur. May get brown dead areas as well as distorted leaves. These plants now get aster yellows. Disease of Coneflower
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4533
Jenny_Smith
Jenny_Smith
Azalea Leaf and Flower Gall
  Azalea Leaf and Flower Gall March 17, 2009
The disease will cause pale green, pink white or brown fleshy galls, which are caused by the fungus Exobasidium vaccinii. Exobasidium vaccinii also infects species of Vaccinium including cranberries where it produces bright red, swollen spots on the leaves and fruits. Infected stems become thickened. Azalea Leaf and Flower Gall
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4370
fadinha_green
fadinha_green
Phomopsis Tip Blight of Juniper
  Phomopsis Tip Blight of Juniper March 14, 2009
For most people, the first symptom noticed in the spring (early summer) is the die-back of the new shoot growth (tip blight). The new growth changes from light yellow green to red brown to ash gray as it dies from this fungal disease. Phomopsis juniperovora only kills the new growth - if more than just the new growth is killed, other fungal diseases or environmental injury is involved. Infection starts on immature scale leaves or needles, whereas mature needles are resistant. This infection prog Phomopsis Tip Blight of Juniper
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4693
fadinha_green
fadinha_green
Anthracnose - A Fungal Disease of Shade Trees
  Anthracnose - A Fungal Disease of Shade Trees March 14, 2009
Plant disease of warm humid areas, caused by a fungus (usually Colletotrichum or Gloeosporium). It infects various plants, from trees to grasses. Symptoms include sunken spots of various colours in leaves, stems, fruits, or flowers, often leading to wilting and dying of tissues. Dogwood anthracnose, caused by the fungus Discula destructiva, thrives in cool climates; in the U.S. it has caused severe losses to natural stands of dogwoods in mountainous regions. It is controlled by destroying diseas Anthracnose - A Fungal Disease of Shade Trees
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