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Tar Spot on the Move: Here Are Some Management Tips

First identified in the U.S. in 2015, tar spot has spread rapidly, driven by favorable weather conditions and susceptible hybrids

By Boris Camiletti posted on July 18, 2025 | Posted in Crop Protection

Source: farmdoc daily

First identified in the U.S. in 2015, tar spot has spread rapidly, driven by favorable weather conditions and susceptible hybrids.

Pre-Season Management and Preparation for Tar Spot

April 4, 2019 | Posted in Crop Protection

Source: Iowa State University Extension and Outreach/Integrated Crop Management News

In 2018, the prevalence and severity of tar spot increased dramatically and in some areas caused substantial yield losses. Prepare yourself for the coming growing season with these tar spot management suggestions from University of Illinois Extension Plant Pathologist Nathan Kleczewski.

Differentiating Corn Leaf Diseases

July 3, 2018 | Posted in Crop Protection

Source: University of Nebraska

Very early symptoms of many diseases look similar. For example, small yellow flecks may be indicative of several diseases and it can be hard to differentiate them without the presence of more mature lesions (or use of a microscope to examine spores and bacterial streaming).

When to Consider Foliar Fungicide Applications on Corn

Under certain conditions, applying a fungicide to corn may provide an economic return. A look at a few key criteria will help in determining whether to apply fungicides or wait things out.

July 20, 2017 | Posted in Crop Protection

Source: Penn State Extension

Under certain conditions, applying a fungicide to corn may provide an economic return. A look at few key criteria will help in determining whether to apply fungicides or wait things out.

Innvictis Crop Care Launches Trevo TRZ Fungicide

June 6, 2017

Source: Innvictis Crop Care

The fungicide uses tetraconazole and azoxystrobin to prevent and cure diseases in corn, soybeans and sugarbeets.

Bacterial Leaf Streak of Corn Confirmed in Corn Belt

August 29, 2016 | Posted in Crop Protection

Source: University of Nebraska Extension

Bacterial leaf streak disease in corn — new to the U.S. — has been confirmed in several states, University of Nebraska Extension reports. The impact to yield is unclear.

Deciding Whether to Spray for Gray Leaf Spot

June 27, 2016 | Posted in Crop Protection

Source: Kansas State University Extension

Years of fungicide application research demonstrate that the single best time to apply a fungicide to corn for gray leaf spot control is from VT-R1, says Kansas State University Extension.

Corn Diseases to Watch for in 2016

June 15, 2016 | Posted in Crop Protection

Source: Kentucky Pest News

University of Kentucky Extension recommends keeping an eye out for southern rust and tar spot in corn this season.

Hybrids Resistant to Northern Corn Leaf Blight

February 9, 2016 | Posted in Crop Protection, Seeding & Planting

Source: Ohio State University Extension

Widespread use of conservation tillage favors the survival of the Norther Corn Leaf Blight fungus from year to year and hybrid resistance buildup may also be a problem, says Ohio State University Extension.

Bacterial Stripe of Corn Confirmed in Illinois

October 6, 2015 | Posted in Crop Protection

Source: University of Illinois Extension — The Bulletin

The causal agent of Bacterial Stripe disease was confirmed in Champaign County. Although the disease is not new to the U.S., there’s little information on impact to corn yields.

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