Update on aster leafhopper infectivity in Michigan for June 27-July 6, 2012

Aster yellows infectivity of aster leafhoppers continues to be high.

According to five aster leafhopper sweep-net samples taken between June 27 and July 6, 2012, aster yellows infectivity ranged from 4.8 to 15.9 percent on carrot, celery and lettuce crops.

Thresholds per 100 sweeps:

12-15 percent infectivity: celery - 2, carrot - 3, lettuce - 1
9 percent infectivity: celery - 3, carrot - 5
5 percent infectivity: celery - 8, carrot - 10

The threshold for lettuce is slightly lower than for celery.

To learn more about aster leafhopper biology, trapping and management, see the recent MSU Extension News articles:

Numbers on map represent percent of leafhoppers infected
with aster yellows. Each number represents a separate sample
collected between June 27 and July 6, 2012.

 Dr. Szendrei’s work is funded in part by MSU‘s AgBioResearch.

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