Following frost and challenging weather conditions, it’s not uncommon to find wide staging variability in Ontario corn fields this year. Uneven development will complicate timing of fungicide and insecticide applications, notes Dale Cowan, senior agronomist with AGRIS Cooperative, in this installment of the Corn School. “You have to get an idea of what percentage of the… Read More
Category: Corn Disease, Weeds & Insects
Several factors converge to increase the threat of diseases on a corn crop, from the history of a disease in the field, to the amount of residue, to the weather. Unfortunately, several corn diseases are carried by wind and can end up in your field whether you practice good rotation practices or not. Related: How… Read More
You have several corn fields and only one of you — how do you prioritize which field gets fungicide first? 2015 is shaping up to likely be a high disease pressure year, says Albert Tenuta, field crop plant pathologist with the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA), and a little planning now… Read More
Skipped plants in a corn row aren’t always due to mechanical error or seedling blights. Early insects like wireworm or grubs can kill plants rather stealthily, leaving gaps in a row or neat leaf damage, while cutworm can clip off a patch of plants overnight. Knowing which insect causes what damage is important when assessing… Read More
Do you manage your corn crop differently, based on whether or not you’ll be using a fungicide or topped-up nitrogen rates? That may end up being a new recommendation, as research is beginning to offer clues on how each input works with the other — sometimes providing not just additive benefits, but synergistic ones (think:… Read More
Farmers fought hard (sometimes through deep snow that disappeared soon after) to get the 2014 Ontario corn crop off, but there’s as much as 5% of the crop still standing. There’s really nothing you can do about the crop being out until the snow finally melts, but farmers who have been keeping eye on their… Read More
If you’ve noticed increasing levels of northern corn leaf blight in some of your fields, it could be that the hybrids you’re planting don’t have the right gene to resist infection. That’s because the pathogen has evolved to bypass some of the older sources of resistance, says Albert Tenuta, field crop pathologist with the Ontario… Read More
Farmers still have a bit of time to evaluate their fields for levels of grubs and wireworms, two key pests that will factor in to the need for a neonicotinoid pesticide seed treatment. And that’s good news, because the deadline to ordering fungicide-only corn seed is rapidly approaching. Most companies have a mid- to late-November… Read More
The corn borer is a relatively low-level pest in much of the corn crop in Western Canada, but it certainly poses a risk. What’s more, just because you planted a corn borer-resistant variety doesn’t mean you get out of scouting — every farmer who grows corn should be scouting for the pest, says John Gavloski,… Read More
Growing a bumper crop of corn requires a big meal of plant nutrients. But if you’re going to feed a hulk of a plant, you’ve got to make sure you protect it too. Fungicides may not always be warranted, but if the yield potential is there and conditions are right for disease development, a fungicide… Read More