As tar spot continues to spread northeast across Ontario’s corn region, growers are looking to build a better defence against the yield-robbing leaf disease. Crop genetics and fungicide will likely be the one-two punch growers use to control the disease, which is characterized by tar-like speckling on the upper surface of corn leaves. The fungal… Read More

Ever since tar spot leaf disease first hit Ontario corn growers’ radar back in 2019, extension specialists and industry have been working diligently to stay a step ahead of the yield-robbing disease. Seed companies have identified hybrids in their product lineups with stronger resistance to the disease and also worked with growers to effectively manage… Read More

Field research shows that the best time to tackle tar spot with a fungicide is the VT/RI stage of corn development — when the tassel is visible and silks are emerging. That’s the case again this year, says Ontario Ministry of Agriculture, Food and Agribusiness plant pathologist Albert Tenuta. He’s been testing fungicide treatments to… Read More

There are more than a few seeding, fertilizing, and scouting questions to wade through in this week’s Wheat Pete’s Word podcast, and that’s exactly how host Peter “Wheat Pete” Johnson likes it. Before answering the top agronomy questions, though, Johnson has two reminders for all of us on being courteous and on taking care of… Read More

It’s been a tough spring for planting corn in Ontario. Planting season started in late April and some growers are now just getting their last acres in the ground during the final days of June. That seven-week planting season will present challenges for growers as they try to assess yield potential and apply fungicides to… Read More

Tar spot was a little late arriving in Ontario cornfields in 2023, but the leaf disease ramped up post tasseling, and with an extended fall, took a late-season bite out of grain yields in southwestern areas of the province. Growers who sprayed fungicides to defend their crop against disease were rewarded with higher yields, reports… Read More