<p><b>View of cultivated area with lettuce</b></p><p>Autor: Ricardo J. Domingues</p> <p><b>Symptom of reddening of the cortex and reduction of the root system. Healthy (left) and diseased (right) plant.</b></p><p>Autor: Jesus G. Töfoli</p> <p><b>Darkening of conducting vessels.</b></p><p>Autor: Jesus G. Töfoli</p> <p><b>Reddening and browning of the cortex.</b></p><p>Autor: Jesus G. Töfoli</p> <p><b>Macro (M) and microconidia (m) of Fusarium oxysporum f.sp. lactucae</b></p><p>Autor: Ricardo J. Domingues.</p> <p><b>Chlamydospores: Resistance structures that can perpetuate the pathogen in the soil for long periods.</b></p><p>Autor: Ricardo J. Domingues.</p>