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Infestation by Russian wheat
aphid may occur anytime of year in the western half of Kansas, but it is
more common in areas within 50 miles of the Colorado border. Signs of
infestation are distinct. Look for purple to pink discoloration on
rolled-up leaves. Long, white streaks are also common on the upper leaf
surface. Russian wheat aphids are light green with cigar shaped bodies.
Cornicles (tailpipe structures typical of aphids) are absent. These
insects are usually located within the rolled portion of the leaves,
within the boot, or in trapped heads. This picture shows a colony of
Russian wheat aphids inside a rolled leaf. The purple, green, and white
striping on the leaf is visible here also. Halt, Yumar, and Prowers carry
resistance to Russian wheat aphid. |
