Black Tar Spot
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Black Tar Spot
rhytisma acerinum
The Black Tar Spot, scientific name Rhytisma acerinum, is a fascinating and common fungal pathogen primarily affecting maple trees. It's easily recognized by the distinctive, shiny black spots it forms on leaves, particularly prominent in late summer and autumn. While its appearance might initially cause concern for tree health, R. acerinum is largely considered a cosmetic disease, rarely causing significant harm to its host. Its presence is often seen as an indicator of good air quality, as it is sensitive to sulfur dioxide pollution, making it an interesting bio-indicator in urban and rural environments.
Hábitat: Found on the leaves of maple trees (Acer species) in deciduous forests, parks, gardens, and urban green spaces where maples are prevalent.
Aspecto
This fungus is characterized by its glossy, raised, tar-like black spots that develop on the upper surface of maple leaves. These spots are typically circular to irregular in shape, ranging from 0.5 to 3 centimeters in diameter, and are often surrounded by a bright yellow or yellowish-green halo, particularly in their earlier stages. As the season progresses, the yellow margin may fade, leaving a stark black patch. Multiple spots can coalesce to form larger, more irregular blotches.
ReinoFungiFiloAscomycotaClaseLeotiomycetesOrdenRhytismatalesFamiliaRhytismataceaeGéneroRhytisma
Categoría
HongosRareza
Common
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Datos interesantes
Despite its alarming appearance, this fungal infection causes no significant harm to its host maple tree, primarily being a cosmetic issue.
Its life cycle involves two distinct phases: a parasitic phase on living maple leaves and a saprophytic phase on fallen, decaying leaves during winter.
The distinctive yellow halo often seen around the black spots is actually a reaction of the maple leaf tissue to the fungal infection.
The presence of Black Tar Spot on maple leaves is often used as a natural indicator of good air quality, as the fungus is highly sensitive to sulfur dioxide pollution.
Habilidades especiales
Habilidad
Air Quality Indicator
Rhytisma acerinum is highly sensitive to sulfur dioxide pollution, meaning its presence often indicates relatively clean air environments. In areas with significant air pollution, this fungus is rarely observed.
Habilidad
Overwintering Survival
The fungus overwinters within the fallen infected leaves on the forest floor. In spring, it produces tiny, fruiting structures that release spores to infect new, emerging maple leaves.
Habilidad
Benign Pathogen
Despite its parasitic nature and visible impact, Black Tar Spot typically causes no serious damage to its host tree. It is primarily a cosmetic issue, not affecting the tree's overall vigor or survival.
Medidas y detalles
- Longitud
- 0-3 cm
- Esperanza de vida
- 0-1 años
Dieta y alimentación
Rhytisma acerinum absorbs nutrients from the living cells of maple leaves during its initial parasitic phase. Once the leaves fall, the fungus continues to derive nutrients saprophytically from the decaying leaf tissue on the ground.
Diferencias por edad: The fungus transitions from a parasitic lifestyle on living maple leaves to a saprophytic lifestyle once the leaves senesce and fall to the ground.
Alimentos principales
- Maple leaf nutrients
- Decaying maple leaf tissue
Método de búsqueda
- Absorption
Conexiones ecológicas
host plant
Norway Maple
Acer platanoides
Primary host for parasitic growth
host plant
Sycamore Maple
Acer pseudoplatanus
Primary host for parasitic growth
competitor
Earthworm
Lumbricus terrestris
Decomposers of infected fallen leaves
indicator for
Humans
Homo sapiens
Fungal diseases like this can be impacted by atmospheric composition, particularly pollution
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También conocido como
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Seguridad
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Preguntas frecuentes
¿Cómo identificar a Black Tar Spot?
La forma más fácil de identificar a Black Tar Spot es usar la aplicación de identificación de naturaleza Snappit.
¿Cuál es el longitud de Black Tar Spot?
0-3 cm
¿Cuál es el esperanza de vida de Black Tar Spot?
0-1 años
¿Qué come Black Tar Spot?
Rhytisma acerinum absorbs nutrients from the living cells of maple leaves during its initial parasitic phase. Once the leaves fall, the fungus continues to derive nutrients saprophytically from the decaying leaf tissue on the ground.
¿Dónde se encuentra normalmente Black Tar Spot?
Found on the leaves of maple trees (Acer species) in deciduous forests, parks, gardens, and urban green spaces where maples are prevalent.
¿Cómo caza Black Tar Spot?
Absorption
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