2014 Grain Corn Ear Mould and Vomitoxin Survey

Greg Stewart, OMAFRA Corn Specialist; Albert Tenuta, OMAFRA Field Crop Pathologist

The OMAFRA Field Crops team has completed the survey of the 2014 Ontario corn crop to determine ear mould incidence and the occurrence of mycotoxins in the grain. These mycotoxins, particularly vomitoxin (DON) produced primarily by Gibberella/Fusarium ear moulds, are grading factors and can be disruptive when fed to livestock, especially hogs.
202 samples were collected from October 14 to October 17, 2014 from corn fields across the province. In each field, 2 random areas were selected: in each area 10 consecutive ears were hand harvested and bagged. In fields with several hybrids, representative samples were taken from two areas for each hybrid (maximum of 4 hybrids per field). The 20-ear samples were then immediately dried and shelled. The resultant sample was thoroughly mixed and a sub-sample provided to A&L Laboratories in London for vomitoxin (DON) analysis.

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Potassium deficiency in corn source:

Potassium is a key ingredient to producing quality crops

Potassium (K) levels have been declining in Ontario fields. Many fields that have been sampled have noticed a drop in their soil sample potassium levels from a few years ago. Simply said, growers are not applying enough fertilizer. In some cases fertilization is less than what the crop will remove causing a decrease in soil nutrient reserves. Potassium is one of the three nutrients needed in large quantities by plants. This essential nutrient could be a limiting factor in your crop yields if your soil is not maintained at adequate levels.

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Automatic Soil Sampler

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