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Lolium species commonly infest small grain cereals and other autumn and early spring sown crops, but also perennial crops such as orchards, vineyards and alfalfa. Lolium rigidum is predominant in southern regions whereas Lolium multiflorum is prevalent in the north. In most of central Europe the two species coexist.
Echinochloa crus-galli (barnyard grass) is an important weed species in all countries where spring-summer crops are cultivated. Present mainly in rice, maize, sunflower and soybean, but also sugar beet and potatoes, the agronomical importance relates to its high competitive ability, high densities and several flushes during the season.
Apera spica-ventiis (silky bentgrass) is a weed problem in winter cereals due to high density levels and its competitive ability especially where there is a higher proportion of winter annual crops in rotation.