Gall on a stem of Solidago caused by a parasitic goldenrod gall fly Eurosta solidaginis on Richards Loop Trail in Sam Houston National Forest. Texas

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Sam Houston Forest, Texas, March 30, 2024

Album 3502: Sam Houston Forest, Texas, March 30, 2024

The image features a close-up shot of a plant with a noticeable bulge, which is a gall caused by the parasitic goldenrod gall fly (Eurosta solidaginis).

The plant appears to be a species of Solidago, commonly known as goldenrod, and is characterized by its slender green stems that are covered in fine hairs. The leaves are long and narrow, with serrated edges, and are attached to the stem in an alternate pattern.

In the center of the image, a prominent bulge can be seen on one of the stems. This bulge is caused by the parasitic goldenrod gall fly (Eurosta solidaginis), which has laid its eggs inside the plant's stem. The larvae that hatch from these eggs feed on the plant's tissues, causing the stem to swell and form a protective gall.

The background of the image is dark, with only a few strands of vegetation visible in the distance. This suggests that the image was taken outdoors, possibly in a forest or woodland area.

Overall, the image provides a detailed view of the plant's anatomy and highlights the unique relationship between the goldenrod gall fly and its host plant. – AI vision

🇪🇸 Descripción en español / Spanish Description

El aguijón de una Solidago provocado por una mosca parásita de las agallas de Solidago Eurosta solidaginis en el Richards Loop Trail del Bosque Nacional Sam Houston. Texas, 30 de marzo de 2024. La imagen muestra un primer plano de una planta con un bulto notable, que es una agalla provocada por la mosca parásita de las agallas de solidago (Eurosta solidaginis). La planta parece pertenecer a una especie de Solidago, comúnmente conocida como sálvia, y se caracteriza por sus delgados tallos verdes cubiertos de pelillos finos. Las hojas son largas y estrechas, con bordes serrados, y están unidas al tallo en una disposición alterna. En el centro de la imagen, se puede observar un bulto prominente en uno de los tallos. Este bulto está provocado por la mosca parásita de las agallas de solidago (Eurosta solidaginis), que ha puesto sus huevos dentro del tallo de la planta. Las larvas que eclosionan de estos huevos se alimentan de los tejidos de la planta, lo que hace que el tallo se hinche y forme una agalla protectora. El fondo de la imagen es oscuro, con solo unos cuantos hebras de vegetación visibles en el lejano horizonte. Esto sugiere que la imagen fue tomada al aire libre, posiblemente en un bosque o área boscosa. En general, la imagen proporciona una vista detallada de la anatomía de la planta y destaca la relación única entre la mosca parásita de las agallas de solidago y su planta hospedadora. – Spanish translation

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