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Pycnia of Juniper-hawthorn rust fungus...in Sam Houston National Forest. Texas  
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Pycnia of Juniper-hawthorn rust fungus (Gymnosporangium globosum) on leaves of littlehip hawthorn (Crataegus spathulata) on Richards Loop Trail in Sam Houston National Forest. Texas, July 23, 2023

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Similar   Thumbnail of picture 3410-15: Leaves of littlehip hawthorn (Crataegus spathulata) with pycnia of ... Sam Houston National Forest. Texas, July 23, 2023 Thumbnail of picture 3410-18: Pycnia of Juniper-hawthorn rust fungus (Gymnosporangium globosum ... Sam Houston National Forest. Texas, July 23, 2023 Thumbnail of picture 3410-12: Juniper-hawthorn rust fungus (Gymnosporangium globosum) on littlehip ... Sam Houston National Forest. Texas, July 23, 2023 Thumbnail of picture 3410-17: Tissues infected by Juniper-hawthorn rust fungus (Gymnosporangium ... Sam Houston National Forest. Texas, July 23, 2023 Thumbnail of picture 3510-11: Cedar-hawthorn rust fungus (Gymnosporangium globosum) on littlehip ... Sam Houston National Forest. Texas, April 13, 2024
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The Juniper-hawthorn rust fungus, Gymnosporangium globosum, was observed infecting the leaves of littlehip hawthorn (Crataegus spathulata) on Richards Loop Trail in Sam Houston National Forest, Texas, on July 23, 2023. The fungus causes pycnia, a type of rust disease that results in the formation of small, raised pustules on the leaves. These pustules are visible as small, round, orange-red structures that can be seen on the surface of the leaves. The infection was observed to have a significant impact on the leaves, causing them to become distorted and discolored. This is an example of how fungal diseases can affect the health and appearance of plants in the forest ecosystem. – generated by AI

The image presents a detailed view of leaves affected by the Juniper-hawthorn rust fungus (Gymnosporangium globosum) on littlehip hawthorn trees (Crataegus spathulata). The photograph captures several leaves with varying degrees of infection, showcasing the distinct characteristics of the disease.

**Leaf Appearance**

* Leaves exhibit a range of colors, including green, yellow, and brown.
* Some areas display a mix of green and yellow hues, while others appear more predominantly yellow or brown.
* The edges of the leaves are slightly curled inward, indicating potential damage from fungal infection.

**Fungal Infection Symptoms**

* Small black pycnia (fruiting structures) are visible on the surface of the leaves.
* These pycnia resemble tiny dots or spots and are scattered across the leaf blades.
* Some areas feature clusters of pycnia, while others display isolated instances.

**Leaf Margin and Veins**

* The margins of the leaves appear slightly wavy or serrated, with some leaves displaying more pronounced tooth-like structures than others.
* Leaf veins are visible beneath the surface, particularly in areas where the leaf is less infected.
* Some veins exhibit a reddish-brown coloration, indicating potential damage from the fungal infection.

**Overall Appearance**

* The leaves display a mix of healthy and diseased tissue, with some areas appearing more severely affected by the fungus than others.
* The image provides a clear visual representation of the effects of Juniper-hawthorn rust fungus on littlehip hawthorn trees. – AI vision

Pycnia de la roya del espino-enebro (Gymnosporangium globosum) en las hojas de espino de hoja pequeña (Crataegus spathulata) en el Richards Loop Trail en la Forestal Nacional Sam Houston. Texas, 23 de julio de 2023. La imagen presenta una vista detallada de las hojas afectadas por la roya del espino-enebro (Gymnosporangium globosum) en los árboles de espino de hoja pequeña (Crataegus spathulata). La fotografía captura varias hojas con diferentes grados de infección, mostrando las características distintivas de la enfermedad.

**Apariencia de las hojas**
* Las hojas presentan una gama de colores, incluyendo verde, amarillo y marrón.
* Algunas áreas muestran una mezcla de tonos verdes y amarillos, mientras que otras parecen más predominantemente amarillas o marrones.
* Los bordes de las hojas están ligeramente doblados hacia dentro, lo que indica un posible daño por infección fúngica.

**Síntomas de la infección fúngica**
* Son visibles pequeñas piocnias negras (estructuras de formación de frutos) en la superficie de las hojas.
* Estas piocnias se asemejan a puntitos o manchitas y están esparcidas por todo el limbo foliar.
* Algunas áreas presentan racimos de piocnias, mientras que otras muestran casos aislados.

**Margen y venas de las hojas**
* Los márgenes de las hojas aparecen ligeramente ondulados o serrados, con algunas hojas mostrando estructuras dentadas más prominentes que otras.
* Las venas de las hojas son visibles por debajo de la superficie, particularmente en zonas donde el limbo foliar está menos infectado.
* Algunas venas presentan una coloración parda rojiza, lo que indica un posible daño por infección fúngica.

**Apariencia general**
* Las hojas muestran una mezcla de tejido sano y enfermo, con algunas áreas que parecen más gravemente afectadas por el hongo que otras.
* La imagen proporciona una representación visual clara de los efectos de la roya del espino-enebro en los árboles de espino de hoja pequeña. – Spanish translation


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