Update on aster leafhopper infectivity in Michigan for July 24-27, 2012

Aster leafhopper infectivity is still high in parts of Michigan, but leafhoppers are causing less of a problem in commercial vegetable fields than earlier in the season due to their lower abundance.

Please see the map below for aster yellows infectivity of aster leafhoppers. Two aster leafhopper samples were tested during July 24-27, 2012.  

Thresholds per 100 sweeps:
30 percent infectivity: celery - 1, carrot - 1
5 to 6 percent infectivity: celery - 7/8, carrot - 9/10

Aster leafhopper
Numbers on map represent percent of leafhoppers infected
with aster yellows. Each number represents a separate sample
collected between July 24-27, 2012.

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

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

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