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Diamond Scale
Sooty Mold
Powdery Mildew
Fire Blight
Anthracnose

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Plant and Tree disease
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Diamond Scale

DIAMOND SCALE
Despite the name, diamond scale is not an insect pest. Instead the fungusPhaeochoropsis neowashingtoniae(previously calledSphaerodothis neowashingtoniae) causes this common foliar disease, which derives its name from its characteristic diamond-shaped fruiting bodies.
Diamond scale attacks primarily the California fan palm (Washingtonia filifera) in coastal regions and the intermediate and interior valleys of California subject to marine influence; it rarely occurs in arid regions such as the Central Valley or the deserts of Southern California.

Sooty Mold

Sooty mold is the common name applied to several species of fungi that grow on honeydew secretions on plant parts and other surfaces. The fungi’s dark, threadlike growth (mycelium) gives plants or other substrates the appearance of being covered with a layer of soot.
Sooty molds don’t infect plants but grow on surfaces where honeydew deposits accumulate. Honeydew is a sweet, sticky liquid that plant-sucking insects excrete as they ingest large quantities of sap from a plant. Because the insect can’t completely utilize all the nutrients in this large volume of fluid, it assimilates what it needs and excretes the rest as “honeydew.

Powdery Mildew

Powdery mildew is a common disease on many types of plants and is prevalent under the diverse conditions found in many areas of California. Different powdery mildew fungi cause disease on different plants. These fungi tend to infect either plants in the same family or only one species of plant.
You can recognize this disease by the white, powdery mycelial and spore growth that forms onleaf surfacesand shoots and sometimes on flowers and fruits. Powdery mildews may infect new or old foliage.

Fire Blight

Fire blight, caused by the bacteriumErwinia amylovora, is a common and frequently destructive disease of pome fruit trees and related plants. Pear (Pyrusspecies) and quince (Cydonia) are extremely susceptible. Apple, crabapple (Malusspecies), and firethorns (Pyracanthaspecies) also are frequently damaged. Fire blight is less common on hawthorn (Crataegusspecies),Spiraea,Cotoneaster, toyon (Photiniaspecies), juneberry or serviceberry (Amelanchierspecies), loquat (Eriobotria), mountain ash (Sorbus

Anthracnose

Anthracnose is a group of diseases found on many deciduous and evergreen trees and shrubs; some trees such as sycamore, ash, and evergreen elms can be noticeably blighted. Often called leaf, shoot, or twig blight, anthracnose results from infection by any of several different fungi, includingApiognomonia errabunda, A. veneta, Discula fraxinea, Glomerellasp.,Gnomoniasp., andStegophora ulmea,depending on the tree attacked. Infections on deciduous plants are more severe in areas where prolonged spring rains occur after new growth is produced.

Impatiens

Impatiens, New Guinea impatiens—
Impatiens wallerana
Family Balsaminaceae (Balsam family)
Plant Identification
Impatiens are annual or perennial plants.  Perennial species are often grown as annuals.  Flowers bloom throughout the summer and vary in color, which includes pink, white, red, purple, and orange.  Impatiens are usually planted in containers or borders and attract hummingbirds.
Optimum conditions for growth

Pansy

Pansy, Violet—
Viola
spp.
Family Violaceae (Violet family)
Plant Identification
Pansies and most violets are perennial plants, although they are often grown as winter annuals in mild winter areas. They are grown mostly in borders, edges, or containers and sometimes used in rock gardens. Flowers may bloom in spring through summer and even during the winter in mild climates. They are brightly colored including blue, red, purple, yellow, and other colors.

Begonias

Begonia—
Begonia
spp.
Family Begoniaceae (Begonia family)
Plant Identification
Begonias are perennial plants, but many are grown as annuals.  They are often grown in potted plants or in beds.  Begonia flowers bloom in early summer through fall and are clustered and come in various colors such as white, yellow, orange, red, or pink.  Leaves are sometimes multicolored.
Optimum conditions for growth
Begonias do best in filtered shade or bright indirect light.

Petunias

Petunia—
Petunia x hybrida
Family Solanaceae (Nightshade family)
Plant Identification
Petunias are low-growing perennial plants generally treated as annuals. Leaves are thick and somewhat sticky. Flowers may be ruffled or funnel-shaped and are of various colors including white, yellow, red, blue, and purple. They bloom from spring into winter. Petunias are often grown in beds, containers, window boxes, or as ground covers.