Fungicide Response by Corn Product

Trial Overview

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  • Corn leaf diseases may lead to reduced photosynthesis during grain fill, which may reduce levels of carbohydrates to the stalks and roots.1
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  • Fungicides may be applied to help prevent the development or spread of corn leaf diseases.
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Research Objective

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  • A study was established to determine whether corn products differ in their yield response to fungicide application. 
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Monmouth. IL
Silt Loam
Corn
Conventional
04/15/2016
09/20/2016
36,000
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Eight corn products, ranging in maturity from 108 RM to 116 RM were planted in two replications. Corn was planted in
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Eight rows of each corn product were planted, four rows were treated with Headline AMP® Fungicide at tassel (July 25, 2016) and four rows were left as untreated checks. Yield was adjusted to 15% moisture content. 
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Understanding the Results

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Figure 1. The effect of Headline AMP® Fungicide on average yield potential of eight different corn products.
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UTC = untreated check
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  • Rainfall contributed to conditions for disease development, but the onset of disease symptoms occurred very late in the season. 
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  • Four of the eight corn products showed a positive response to the fungicide application (Figure 1). 
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  • The late onset of disease symptoms in these plots may have minimized the yield response to fungicide application.
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What Does This Mean for Your Farm

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  • When planting corn products with susceptible genetics or in fields with a history of disease, scout fields for leaf diseases prior to tassel. 
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  • To determine if a fungicide application is warranted, consider yield potential, corn growth stage, potential for additional development of disease symptoms, fungicide application cost, and the price of corn.
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  • Talk with your local DSM and TA to learn more about fungicide response to corn products.
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