Weed Control Guide for Ohio Field Crops

Corn: Postemergence Herbicides - Systemic

Herbicide	Formulation	Product Rate Range
Spirit	57DF	1 oz (1 packet per 4 acres)

Tank-mix with: Banvel, Clarity, 2,4-D, atrazine, Buctril/Moxy, Buctril+atrazine, Marksman, Beacon, Accent.

• Spirit is a premix of prosulfuron (Peak) plus primisulfuron (Beacon), translocated sulfonylurea herbicides. The weed control spectrum of Spirit is similar to Exceed, but Spirit is likely to be less effective on lambsquarters and a few other broadleaf weeds. Tank-mixing with Banvel/Clarity, 2,4-D, or Buctril/Moxy will improve annual weed control. Most effective control/suppression of perennial broadleaf weeds will occur when tank-mixed with 2,4-D, Banvel, or Clarity. Spirit is weak on annual morningglories and yellow nutsedge.
• Mode of action: ALS inhibitor.
• Most of the guidelines and label directions for Spirit use are similar to those for Exceed. See the Exceed description for more information.
• Follow these guidelines to avoid carryover of Spirit to subsequent crops: 1) Avoid use where soil pH is greater than 7.8. If used where soil pH is greater than 7.8, plant only field corn or small grains the following year; 2) where less than one inch of rain occurs within one month of application, or less than 12 inches of rain occurs within 5 months after application, plant only corn, small grains, or STS soybeans the following year ; 2) north of Interstate 80, do not plant soybeans within 18 months of application; 3) south of I-80, soybeans can be planted 10 months after application where soil pH is less than 7.8; and 4) do not apply after June 30. See label for guidelines on rotation to other crops.
• Apply broadcast or directed when field corn is 4 to 24 inches tall. To avoid injury and improve spray coverage on weeds, apply as a directed spray using drop nozzles when corn is more than 20 inches tall.
• For popcorn, apply as a directed spray using drop nozzles when corn plants are 10 to 24 inches tall, and before tassel emergence. For seed corn inbreds, Spirit can be applied broadcast when corn is between 4 and 20 inches tall, or until the 6-collar stage, whicever occur first. Use drop nozzles when seed corn inbreds are 20 to 24 inches tall and before tassel emergence. Inbred lines and popcorn hybrids should be thoroughly tested for sensitivity to Exceed before treating large acreages. Do not apply to sweet corn.
• Apply in a minimum spray volume of 10 gpa. Increasing the volume to at least 20 gpa can improve control in dense weed infestations.
• Apply with crop oil concentrate (1 to 4 pints/A) or nonionic surfactant (1 to 2 quarts/100 gallons). Liquid nitrogen fertilizer (2 to 4 quarts/A) or AMS (2 lbs/A) may be added to improve control of velvetleaf and other weeds. Crop oil concentrate is generally more effective than nonionic surfactant. Use of a methylated seed oil (Meth Oil, Priority MSO, Sun-It II, for example) may improve control when weeds are large or drought-stressed.
• Allow 4 hours between application and rainfall.

Back | Forward | Table of Contents