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Slafractonia leguminicola (formerly Rhizoctonia leguminicola) is a fungus that is a plant pathogen that most often attaches itself to the Trifolium pratense or red clover. It is also called black patch disease. The infection is first seen as small black patches on the leaves of red clover (often on the bottom of the leaves first) and spreads to ...
Oak wilt is a devastating exotic disease, killing some trees rapidly in a single season. [7] Oak wilt is an important disease in urban areas where trees are highly valued. . The disease reduces property values because of the loss of trees and is economically costly to the property owner since they or the local government must pay for tree remo
Verticillium wilt is a wilt disease affecting over 350 species of eudicot plants. It is caused by six species of Verticillium fungi: V. dahliae, V. albo-atrum, V. longisporum, V. nubilum, V. theobromae and V. tricorpus. [1] Many economically important plants are susceptible including cotton, tomatoes, potatoes, oilseed rape, eggplants, peppers ...
ʻŌhiʻa Lehua flowers. Rapid ʻŌhiʻa Death (ROD) is a fungal disease that is rapidly killing forests of ʻōhiʻa (Metrosideros polymorpha)—an ecologically important native tree species within the Hawaiian Islands that has provided a plethora of habitats for endangered birds and other species. [1] Initially reported by landowners in Puna ...
Phytophthora ramorum is the oomycete known to cause the disease sudden oak death (SOD). The disease kills oak and other species of trees and has had devastating effects on the oak populations in California and Oregon, as well as being present in Europe. Symptoms include bleeding cankers on the tree's trunk and dieback of the foliage, in many ...
Slime flux, also known as bacterial slime or bacterial wetwood, is a bacterial disease of certain trees, primarily elm, cottonwood, poplar, boxelder, ash, aspen, fruitless mulberry and oak. A wound to the bark, caused by pruning, insects, poor branch angles or natural cracks and splits, causes sap to ooze from the wound. Bacteria may infect ...
A wilt disease is any number of diseases that affect the vascular system of plants. Attacks by fungi, bacteria, and nematodes can cause rapid killing of plants, large tree branches or even entire trees. A pine tree with pine wilt. Wilt diseases in woody plants tend to fall into two major categories, those that start with the branches and those ...
Plant disease triangle. Epidemiology is the study of factors affecting the outbreak and spread of infectious diseases. [10] A disease triangle describes the basic factors required for plant diseases. These are the host plant, the pathogen, and the environment. Any one of these can be modified to control a disease. [11]