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:
- Update on aster leafhopper infectivity in Michigan for July 24-27, 2012
- Update on aster leafhopper infectivity in Michigan for July 16-20, 2012
- Update on aster leafhopper infectivity in Michigan for June 13-19, 2012
- Update on aster leafhopper infectivity in west Michigan
- Aster leafhoppers are abundant in Michigan
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.