cereal leaf beetle

The first sign of CLB activity in the spring is
adult feeding damage on the plant foliage. Adult injury
is characterized by elongated, slender slits in the upper
leaf surface. The eggs are laid
end to end, singly or in
groups of two or three on
the upper leaf surface near
the base of the leaf. Newly
laid eggs are bright yellow,
darkening to orange-brown
and finally to black before
they hatch. Egg hatch may
take from four to 23 days
depending on temperature. The larva has a light yellow body with brown head and legs. They have three
pairs of legs located close to the head end. The body is protected by a layer of slimy fecal
material which makes them look like a slug. When working or walking in an infested
field the slimy covering will rub off on your clothing. Although both adults and larvae
cause feeding damage, the larvae are responsible for the majority of the damage. They
feed on the leaf surface between veins, removing all the green material down to the lower
cuticle, resulting in an elongated windowpane in the leaf. Severe feeding damage gives
the field a frosted appearance.