Botryosphaeria obtusa: Difference between revisions

Latest revision as of 05:47, 16 February 2025

A fungal pathogen affecting plants

Botryosphaeria obtusa is a fungus that is a known plant pathogen affecting a variety of hosts, including apple and pear trees. It is responsible for diseases such as black rot and frogeye leaf spot.

Morphology[edit]

File:Botryosphaeria obtusa.jpg

Botryosphaeria obtusa on apple tree

Botryosphaeria obtusa produces pycnidia, which are fruiting bodies that appear as small, black structures on the surface of infected plant tissues. These pycnidia release conidia, which are asexual spores that spread the infection.

Life Cycle[edit]

The life cycle of Botryosphaeria obtusa involves both sexual and asexual reproduction. The fungus overwinters in infected plant debris and can produce ascospores in the spring, which are released and spread by wind and rain. The asexual conidia are spread primarily by rain splash.

Symptoms[edit]

Infected plants exhibit a range of symptoms, including:

Black rot on fruit, characterized by dark, sunken lesions.
Frogeye leaf spot, which appears as small, circular spots with a dark border on leaves.
Cankers on branches and twigs, leading to dieback.

Management[edit]

Management of Botryosphaeria obtusa involves cultural practices and chemical controls. Pruning and removal of infected plant material can reduce the source of inoculum. Fungicides may be applied to protect susceptible plants, especially during wet conditions that favor the spread of the fungus.

Related pages[edit]

@@ Line 1: / Line 1: @@
-'''Botryosphaeria obtusa''' is a [[fungus|fungal]] [[pathogen]] that is known to cause significant damage to a variety of [[plant]] species. It is a member of the [[Botryosphaeriaceae]] family and is commonly referred to as the black rot fungus.
+{{Short description|A fungal pathogen affecting plants}}
+{{Taxobox
+| name = Botryosphaeria obtusa
+| image = Botryosphaeria_obtusa.jpg
+| image_caption = Botryosphaeria obtusa on apple tree
+| regnum = Fungi
+| divisio = Ascomycota
+| classis = Dothideomycetes
+| ordo = Botryosphaeriales
+| familia = Botryosphaeriaceae
+| genus = Botryosphaeria
+| species = B. obtusa
+| binomial = Botryosphaeria obtusa
+}}
-== Taxonomy ==
+'''Botryosphaeria obtusa''' is a [[fungus]] that is a known [[plant pathogen]] affecting a variety of hosts, including [[apple]] and [[pear]] trees. It is responsible for diseases such as [[black rot]] and [[frogeye leaf spot]].
-The fungus was first described in 1875 by [[Pier Andrea Saccardo]], an Italian [[mycologist]]. It belongs to the [[Ascomycota]] division, the largest division of fungi, which includes more than 64,000 species. The species name ''obtusa'' refers to the blunt or rounded ends of the [[spore|spores]] produced by the fungus.
-== Description ==
+==Morphology==
-''Botryosphaeria obtusa'' is characterized by its dark, spherical [[fruiting body|fruiting bodies]] that produce spores. The spores are typically hyaline and unicellular, and they are dispersed by wind or water. The fungus also produces [[mycelium|mycelia]], which are the vegetative part of a fungus, consisting of a network of fine white filaments.
+[[File:Botryosphaeria_obtusa.jpg|thumb|right|Botryosphaeria obtusa on apple tree]]
+Botryosphaeria obtusa produces [[pycnidia]], which are fruiting bodies that appear as small, black structures on the surface of infected plant tissues. These pycnidia release [[conidia]], which are asexual spores that spread the infection.
-== Pathology ==
+==Life Cycle==
-''Botryosphaeria obtusa'' is a [[necrotrophic]] pathogen, meaning it kills host tissue and then feeds on the dead material. It is known to cause a variety of diseases in plants, including [[black rot]] in [[grape]]s, [[canker]] in [[apple]] trees, and [[dieback]] in various other plant species. The fungus enters the plant through wounds or natural openings and then spreads throughout the plant, causing necrosis of the tissue.
+The life cycle of Botryosphaeria obtusa involves both sexual and asexual reproduction. The fungus overwinters in infected plant debris and can produce [[ascospores]] in the spring, which are released and spread by wind and rain. The asexual conidia are spread primarily by rain splash.
-== Management ==
+==Symptoms==
-Control of ''Botryosphaeria obtusa'' typically involves a combination of cultural practices and chemical treatments. Cultural practices include pruning infected branches and removing infected fruit. Chemical treatments include the application of [[fungicide]]s. However, the fungus can develop resistance to these treatments, making management challenging.
+Infected plants exhibit a range of symptoms, including:
+* Black rot on fruit, characterized by dark, sunken lesions.
+* Frogeye leaf spot, which appears as small, circular spots with a dark border on leaves.
+* Cankers on branches and twigs, leading to dieback.
-== Impact ==
+==Management==
-The economic impact of ''Botryosphaeria obtusa'' is significant, particularly in the grape and apple industries. The fungus can cause substantial yield losses and reduce the quality of the fruit. In addition, the cost of managing the disease can be high.
+Management of Botryosphaeria obtusa involves cultural practices and chemical controls. Pruning and removal of infected plant material can reduce the source of inoculum. Fungicides may be applied to protect susceptible plants, especially during wet conditions that favor the spread of the fungus.
-== See also ==
+==Related pages==
-* [[Botryosphaeria dothidea]]
+* [[Plant pathology]]
-* [[Botryosphaeria berengeriana]]
+* [[Fungal diseases of plants]]
-* [[Botryosphaeria rhodina]]
+* [[Apple scab]]
+[[Category:Botryosphaeriaceae]]
 [[Category:Fungal plant pathogens and diseases]]
-[[Category:Botryosphaeriaceae]]
+[[Category:Apple tree diseases]]
-[[Category:Ascomycota]]
-{{Fungus-stub}}
-{{food-stub}}
-{{No image}}