University of Illinois

Section 18 for Tilt

August 14, 1998
The State of Illinois has received a Section 18 label for Tilt fungicide on corn for control of gray leaf spot (GLS) and rust, to be applied post-silk. This label is in effect only until August 25, and all applications must be made on or before that date.

Tilt fungicide is designed to preserve yields in the presence of disease; it does not improve plant performance if diseases are not present. The basic guideline is that Tilt is most effective on susceptible hybrids showing lesions at or above the ear leaf following tasseling. If plants are 6 weeks past tasseling, then the effect from Tilt is minimal. Research studies by Dr. Hooker here with northern corn leaf blight demonstrated that leaf diseases cause the most loss if the upper leaves are infected either before tasseling or no later than 6 weeks post-tasseling. Therefore, Tilt applications made very late probably have minimal impact. Producers should scout fields and choose those with highest yield potential, greater disease susceptibility, or a past history of gray leaf spot problems. Tilt should not be applied to every field.

Following are the guidelines for the Tilt label:

The Illinois Department of Agriculture has declared a crisis exemption under Section 18 of the Federal Insecticide, Fungicide, and Rodenticide Act for the use of Tilt Fungicide (propiconazole) to control gray leaf spot and rust in corn in Illinois. The effective dates are from 12:01 a.m. August 10, 1998 to 11:59 p.m. August 25, 1998. The application rate shall be 4 fl. oz. per acre with no more than 12 ounces per season and a 30 day preharvest interval."

Author: Walker Kirby