Fact Sheets And Publications

Browse available resources.
You have questions. We have answers!
Contact UD Extension staff.
Read our latest accomplishments!
Find out how YOU can get involved!
Hands-on experiential learning for UD undergrads!
Submit a sample today.
Analyses to help manage your land.
Chat with a DE Master Gardener.
Protect your family, friends and community.
Protect your flock.



Callisto, Impact, and Laudis are all similar herbicides (HPPD-inhibiting herbicides [Group 27]) and all are labeled for use in sweet corn. Previously, sweet corn hybrids have had limited evaluation to determine tolerance to Impact and Laudis. In 2007, two multi-state field studies were conducted to evaluate hybrid tolerance to Impact and Laudis applied postemergence.


The first study evaluated hybrid tolerance to several herbicides, including Impact, with a strip-plot arrangement and a single replication at sites in Oregon, Minnesota, Wisconsin, Illinois, New York, and Delaware, in 2007. Eighty-seven hybrids were planted in 20 ft long single-row plots and hybrid order was randomized among sites. Seed companies entered hybrids to be evaluated for each herbicide treatment. Impact was tested at twice the labeled rate to differentiate among tolerant and sensitive hybrids.


Download the Sweet Corn Hybrid Tolerance Evaluation

UD Cooperative Extension

This institution is an equal opportunity provider.

In accordance with Federal law and U.S. Department of Agriculture policy, Cooperative Extension is prohibited from discriminating on the basis of race, color, national origin, sex, age, or disability.