Clara Tosi - Xylella in an olive branch

Name and surname: Clara Tosi


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Country: Italy

Title: Xylella in an olive branch - Xylella fastidiosa

Description: In 2013 olive trees were greatly affected in the Apulia region of Italy, where they were attacked by the subspecies Xylella fastidiosa pauca, causing the death of over 1 million olive trees.

This scientific illustration shows two olive branches, one (a.) in a healthy state and another (b.) infested by the Xylella fastidiosa bacteria.
The magnifying circle (c.) reports the difference between healthy and infested xylem vessels of an olive leaf, observed by electron microscopy. The bacteria, transported by Xylella-positive spittlebugs (Philaenus spumarius), accumulates in the xylem vessels, impairing the water uptake in the plant, therefore causing desiccation of leaves and branches.

Category: Scientific illustration

Technique: Watercolor, marker and digital composition
Artificial intelligence: No
Size: 21 x 29.7 cm
Year: 2023