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Those that start with the branches most often start with pathogens that feed on the leaves or bark, those that start with the roots start with wounding or direct entry by the pathogen into the roots, some are spread from one plant to another by way of root grafts. [1] Pathogens that cause wilting diseases invade the vascular vessels and cause ...
Other symptoms include stunting, chlorosis or yellowing of the leaves, necrosis or tissue death, and defoliation. Internal vascular tissue discoloration might be visible when the stem is cut. [2] In Verticillium, the symptoms and effects will often only be on the lower or outer parts of plants or will be localized to only a few branches of a ...
Fusarium wilt is a common vascular wilt fungal disease, exhibiting symptoms similar to Verticillium wilt. This disease has been investigated extensively since the early years of this century. The pathogen that causes Fusarium wilt is Fusarium oxysporum (F. oxysporum). [1] The species is further divided into formae speciales based on host plant.
Root knot nematodes have quite a large host range, they parasitize plant root systems and thus directly affect the uptake of water and nutrients needed for normal plant growth and reproduction, [21] whereas cyst nematodes tend to be able to infect only a few species. Nematodes are able to cause radical changes in root cells in order to ...
Low to moderate populations may cause no visible above ground symptoms, while high populations can lead to stunting, nutrient and water deficiencies, and eventual die-back of the plant. [5] On potato, infection of root lesion nematode can cause a secondary invasion by Verticillium dahliae leading to Potato Early Dying. [1]
The importance of this oomycete is its vast host range and the damage it causes to major crops. This pathogen can cause root rot that stunts the host's growth and damages vascular tissue, which is especially detrimental to pear and apple orchards. It can also infect strawberry plants and cause crown rot, root rot, and leather rot of the fruit. [4]
Bacterial wilt is a complex of diseases that occur in plants such as Cucurbitaceae and Solanaceae (tomato, common bean, [1] [2] etc.) and are caused by the pathogens Erwinia tracheiphila, a gram-negative bacterium, or Curtobacterium flaccumfaciens pv. flaccumfaciens, a gram-positive bacterium.
Phytophthora cinnamomi, also known as cinnamon fungus, is a soil-borne water mould [1] that produces an infection which causes a condition in plants variously called "dieback", "root rot", or (in certain Castanea species), "ink disease". Once infected soil or water is introduced, the organism can spread rapidly throughout an environment.