Lactuca serriola (weed)

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Lactuca serriola foliage (click on image to enlarge it)
Author(s): Mary Ellen (Mel) Harte
Source: IPM Images

Lactuca serriola (weed) L. - (prickly lettuce)

This weed is widely distributed and affects many crops, including cereals and field crops like soybean or sunflowers. In soybean, yield losses can be significant, depending on the density of the weed (Weaver et al., 2019).

L. serriola grows on dry soils, germinating mainly in autumn and spring. The seeds do not undergo dormancy and can also germinate at other times if the conditions of moisture and temperature are suitable. The plants can reach a height of more than 1 m and have lobed leaves with fine spines along the leaf margins and veins. The flower heads are small (1-1½ cm) and light yellow.