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:

map
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.


Michigan State University Michigan State University Close Menu button Menu and Search button Open Close