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Fasciation (pronounced / ˌ f æ ʃ i ˈ eɪ ʃ ə n /, from the Latin root meaning "band" or "stripe"), also known as cresting, is a relatively rare condition of abnormal growth in vascular plants in which the apical meristem (growing tip), which normally is concentrated around a single point and produces approximately cylindrical tissue ...
Plant galls are abnormal outgrowths [1] of plant tissues, similar to benign tumors or warts in animals. They can be caused by various parasites, from viruses, fungi and bacteria, to other plants, insects and mites. Plant galls are often highly organized structures so that the cause of the gall can often be determined without the actual agent ...
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]
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 that start with the roots.
A burl (American English) or burr (British English) is a tree growth in which the grain has grown in a deformed manner. It is commonly found in the form of a rounded outgrowth on a tree trunk or branch that is filled with small knots from dormant buds. Burl formation is typically a result of some form of stress such as an injury or a viral or ...
It may be caused by infectious or noninfectious means. [1] [2] [3] Stunted growth can affect foliage and crop yields, as well as eating quality in edible plants. Stunted growth can be prevented through controlling quality of seeds, soil, and proper watering practices. Treatment will vary greatly depending on the root cause of the stunting.
Phyllody on a purple coneflower (Echinacea purpurea). Phyllody is the abnormal development of floral parts into leafy structures. It is generally caused by phytoplasma or virus infections, [1] though it may also be because of environmental factors that result in an imbalance in plant hormones. [2]
Edema causes the appearance of growths, mainly on the underside of leaves, and can also cause indentations on the top side of leaves. [4] The growths can take a different appearance depending on the plant species, but can often take the form of needle like hairs, blisters, [3] corky growths and white crusty eruptions. [4]