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Ear Rots

Ear Rots Ear rots are some of the most important corn diseases throughout the United States and Canada. Ear rots decrease yield and can greatly reduce grain quality. It is critical to identify ear rots in the field because many of the fungi responsible for ear rots produce toxic chemicals (known as mycotoxins), which can…

Root Rots of Corn

Root rots of corn Corn root rots are very common and are caused by several soilborne pathogens such as Pythium, Fusarium, and Rhizoctonia spp. Root rots occur to some extent in every field, causing economic losses under wet conditions. Aboveground symptoms include stunting, uneven growth, chlorosis, small or poorly filled ears, or wilting. In saturated…

Diplodia Ear Rot of Corn

Diplodia ear rot of corn Diplodia ear rot is caused by the fungus Stenocarpella maydis and S. macrospora and has become a common (and troublesome) disease on corn. These fungi produce mycotoxins in South America and Africa, but no mycotoxins have been associated with Diplodia ear rot in the United States and Canada. This ear rot…

Fungicide Efficacy for Control of Corn Diseases

Fungicide Efficacy for Control of Corn Diseases The Corn Disease Working Group (CDWG) developed ratings for how well fungicides control major corn diseases in the United States. The CDWG determined the efficacy ratings for each fungicide by field-testing the materials over multiple years and locations. Each rating is based on the product’s level of disease…

Mycotoxin FAQs

Mycotoxin FAQs 1. What are mycotoxins? Mycotoxins are natural chemicals produced by certain fungi, some of which cause ear rots in corn. Mycotoxins are nonliving compounds that are byproducts that the fungi produce. Mycotoxins can have detrimental health effects to both humans and animals if they eat contaminated food or feed. 2. What mycotoxins occur…

Corn Disease Loss Estimates For the United States and Ontario, Canada — 2016

Corn Disease Loss Estimates For the United States and Ontario, Canada — 2016 Corn diseases annually reduce yield in the United States and Canada. Diseases of importance vary from year to year, and diseases that affect yield are based on many factors, including weather conditions, crop production practices, and hybrid selection and susceptibility to disease. Plant…

Corn Disease Loss Estimates For the United States and Ontario, Canada — 2015

Corn Disease Loss Estimates For the United States and Ontario, Canada — 2015 Corn diseases annually reduce yield in the United States and Canada. Diseases of importance vary from year to year, and diseases that affect yield are based on many factors, including weather conditions, crop production practices, and hybrid selection and susceptibility to disease. Plant…

Grain Sampling and Mycotoxin Testing

If corn ear rots were a problem in the field, it is important to test harvested grain for mycotoxins. Obtaining a representative sample for mycotoxin testing is critical for accurate results. It’s also important to know that testing methods vary in accuracy. This publication recommends grain sampling and testing methods for detecting mycotoxins. Sampling Requirements…

Using Atoxigenics to Manage Aflatoxin

Using Atoxigenics to Manage Aflatoxin Aspergillus ear rot (caused by the fungus Aspergillus flavus) is one of the most economically important corn ear rots in the southern United States (Fig. 1). The fungus produces aflatoxin, which is a dangerous mycotoxin. Most governments regulate aflatoxin in food and feed, because it is harmful to humans and livestock.…

Storing Mycotoxin-Affected Grain

Storing Mycotoxin-Affected Grain The fungi that cause several corn ear rot diseases produce mycotoxins, chemical substances that can be dangerous to humans and livestock. If you have corn affected by ear rots, there are important management steps to take to limit your losses. This article outlines how to manage stored grain affected by mycotoxins. Harvest…