Plant Pathology I.D. and

Fact SheetBy: Ahad Qamar

2/9/2010

Powdery Mildew

Powdery mildew diseases are caused by many different species of fungi in the order Erysiphales

Retrieved From: http://en.wikipedia.org/wiki/Powdery_mildew

Black Spots on Roses

Black spot will cause a general weakening of the plant so that progressively fewer and fewer blooms are formed if the disease is left unchecked. Plants so weakened are increasingly subject to winter injury.

Retrieved From : http://pmo.umext.maine.edu/factsht/Spotrose.htm

Botrytis

Botrytis is a necrotrophic fungus that affects many plant species, although its most notable hosts may be wine grapes. In viticulture, it is commonly known as botrytis bunch rot; in horticulture, it is usually called greymould or gray mold.

Retrieved From: http://en.wikipedia.org/wiki/Botrytis_cinerea

Damping Off

Damping off is the term used for a number of different fungus-caused ailments which can kill seeds or seedlings before or after they germinate.

Retrieved From: http://en.wikipedia.org/wiki/Damping_off

Phytopthora

Phytophthorais morphologically very similar to true fungi yet its evolutionary history is quite distinct. In contrast to fungi, stramenopiles are more closely related to plants than animals.

Retrieved From: http://en.wikipedia.org/wiki/Phytophthora

Rhizoctonia

Rhizoctonia 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.

Retrieved From :http://en.wikipedia.org/wiki/Rhizoctonia_solani

INSV (Impatiens Necrotic Spot Virus)

INVS is a plant pathogenic virus of the family Bunyaviridae. It was originally believed to be another strain of Tomato spotted wilt virus but genetic investigations revealed them to be separate viruses. It has a tripartategenome and is largely spread by the insect vector of the western flower thrip.

Retrieved From: http://www.freebase.com/view/en/impatiens_necrotic_spot_virus

TSWV (Tomato Spotted Wilt Virus)

Tomato spotted wilt virus is a plant virus vectored by at least 8 species of thrips Two species in particular, Western flower thrips, and tobacco thrips, are common vectors in multiple crop systems in the southeastern US.

Retrieved From: http://www.caes.uga.edu/topics/diseases/tswv/

Phythium

Pythium is a genus of parasitic oomycete. Because this group of organisms were once classified as fungi, they are sometimes still treated as such.Retrieved From: http://en.wikipedia.org/wiki/Pythium

Thielaviopsis

Thielaviopsis is a small genus of fungi in the order Microascales. The genus includes several important agricultural pathogens. The most widespread . the causal agent in several root rot diseases of economically important crop species including cotton and a variety of vegetables

Retrieved From: http://en.wikipedia.org/wiki/Thielaviopsis

Cedar Apple Rust

Cedar-apple rust is one of several similar fungal diseases which could be broadly classified as Juniper-Rosaceous rusts

Retrieved From: http://plantclinic.cornell.edu/FactSheets/cedar-applerust/cedar-applerust.htm

Daylily Rust

Daily lily Rust a new disease to the United States. The pathogen was first described in 1880. It is native to Asia, commonly found in China, Japan, Korea, Taiwan, and Russia.

Retrieved From: http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1781&context=extensionhist

Fire Blight on Crab Apple

Fire blight is the enemy of rosebushes and apple and pear trees.  It is caused by a bacteria which attacks starting generally from the blossoms or flowers and moving up to the twigs and then the branches.

Retrieved From: http://www.fireblight.com/

Anthracnose

Anthracnose diseases of hardwood trees are widespread throughout the Eastern United States. The most common symptom of these diseases is dead areas or blotches on the leaves. Because of the brown and black, scorched appearance of the leaves, the diseases are sometimes called leaf blight.

Retrieved From: http://www.na.fs.fed.us/spfo/pubs/fidls/anthracnose_east/fidl-ae.htm

Bacterial Leaf Spot

A bacterial disease of plants characterized by spotty discolorations on the leaves; examples are angular leaf spot and leaf blotch. 

Retrieved From: http://www.answers.com/topic/bacterial-leaf-spot

ChlorosisNecrosis

Chlorosis is a condition in which leaves produce insufficient chlorophyll.

Death of plant or animal cells or tissues. In plants, necrosis can discolor stems or leaves or kill a plant entirely.

Retrieved From: http://en.wikipedia.org/wiki/Chlorophyll

Retrieved From: http://en.mimi.hu/environment/necrosis.html