Should I be worried about aster yellows in my winter wheat and carry-over of the disease into next spring?

No.

Aster yellows is spread by the aster leafhopper which feeds on a wide variety of hosts, including canola, flax, carrots, perennial landscape plants, and cereals (including winter wheat). However, the populations of aster leafhopper peaked in mid-summer this year and since then numbers have significantly declined. There is a chance that some of the insects may overwinter in Manitoba, but not enough to cause an issue with aster yellows in early spring next year. In 2013, like every year, the level of aster yellows will depend on when the populations of leafhoppers blow in from the southern US and to what extent they are infected with the disease.

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