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Cereal leaf beetle common in spring barley

Cereal leaf beetle damage is present in spring barley crops.
The grub stage eats strips out of leaves. The grubs are slimy and resemble tiny slugs. Most crops will be able to cope with the damage, but if the flag leaf is being badly grazed then an insecticide treatment may be necessary. The grubs should disappear in the next month or so, to be replaced by the adult beetles from mid-July onwards, by which time most crops should be safe from any significant damage.