Sooty black mold fungus on leaves of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas

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Sam Houston Forest - Washington-on-the-Brazos, Texas, November 1 - 3, 2020

Album 2809: Sam Houston Forest - Washington-on-the-Brazos, Texas, November 1 - 3, 2020

The image displays a close-up photograph of two dark green to black leaves, with visible yellow splotches. The leaves appear to be covered in sooty mold.

At first glance, it is difficult to discern the shape or color of the leaves; however, upon closer inspection, they are shaped like elongated ovals with pointed tips and serrated edges. The leaves are positioned against a black background, which may indicate that this image was taken by someone who is an entomologist or mycologist.

The yellow splotches visible on these leaves could be the result of several factors, including:

* **Insect infestation:** Insects like aphids and whiteflies often excrete a sticky substance called honeydew. This can accumulate on plant surfaces, creating ideal conditions for sooty mold growth.
* **Fungal infections:** Certain fungi can cause yellowing or discoloration of leaves, leading to the formation of splotches.

The presence of sooty mold fungus suggests that the tree may be experiencing some form of stress or disease. Sooty mold is a secondary infection caused by various species of fungi (Mucor spp., Rhizopus spp., and others) that feed on the honeydew secreted by insects. It's common to see this type of mold growth in areas with high humidity and temperatures between 75°F-85°F.

To confirm whether the leaves are indeed infested with sooty mold, a closer examination would be necessary. The yellow splotches could also be indicative of other issues such as nutrient deficiencies or environmental stressors like drought or extreme weather conditions.

Overall, while it's challenging to determine the exact cause without further information, this image highlights an interesting aspect of plant pathology and ecology. – AI vision

🇪🇸 Descripción en español / Spanish Description

Moldes de hongos negros manchados en las hojas de un árbol de Hackberry en el Washington-on-the-Brazos State Historic Site. Washington, Texas, 3 de noviembre de 2020. La imagen muestra una fotografía en primer plano de dos hojas verde oscuro a negras, con manchas amarillas visibles. Las hojas parecen estar cubiertas de moho negro. A simple vista, es difícil discernir la forma o el color de las hojas; sin embargo, tras una inspección más detallada, tienen la forma de óvalos alargados con puntas afiladas y bordes serrados. Las hojas se colocan contra un fondo negro, lo que puede indicar que esta imagen fue tomada por alguien que es entomólogo o micólogo. Las manchas amarillas visibles en estas hojas podrían ser el resultado de varios factores, incluyendo:

* **Infestación de insectos:** Insectos como áfidos y moscas blancas suelen excretar una sustancia pegajosa llamada melaza. Esto puede acumularse en las superficies de la planta creando condiciones ideales para el crecimiento del moho negro.
* **Infecciones fúngicas:** Ciertos hongos pueden provocar un amarilleamiento o decoloración de las hojas, lo que lleva a la formación de manchas. La presencia de moho negro sugiere que el árbol puede estar experimentando algún tipo de estrés o enfermedad. El moho negro es una infección secundaria causada por varias especies de hongos (Mucor spp., Rhizopus spp., y otros) que se alimentan de la melaza secretada por insectos. Es común ver este tipo de crecimiento de moho en áreas con alta humedad y temperaturas entre 75°F-85°F (24-30°C). Para confirmar si las hojas están realmente infestadas por el moho negro, sería necesario un examen más detallado. Las manchas amarillas también podrían indicar otros problemas como deficiencias de nutrientes o estresores ambientales como sequía o condiciones climáticas extremas. En general, aunque es difícil determinar la causa exacta sin más información, esta imagen destaca un aspecto interesante de la patología y ecología vegetal. – Spanish translation

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