Ontario Crops Progress with Cool Stress

Winter Wheat Heads as Corn Yellows and Soybeans Emerge

Ontario field crops are progressing despite challenging spring conditions, according to OMAFA's FieldCropNews.com.

Winter wheat has reached the heading stage in the southwest, with T3 fungicide applications beginning. Fields in the north and east are at the flag leaf stage. This is a key time for scouting, with optimal fungicide timing on “day 2” when pollination begins. Fusarium risk remains low during cooler nights but could increase with warmer, wet conditions.

Stripe rust is spreading beyond initial locations, including Chatham and Palmerston, according to FieldCropNews.com. Immediate fungicide application is advised if flowering is still over a week away. Powdery mildew is also present, especially in thick stands.

Corn planting is nearly 85-90% complete in well-drained areas but remains around 30-50% on heavy clay soils. In northern counties like Northumberland and Prince Edward, progress is delayed due to excess moisture.

Cold stress has yellowed emerged corn, but this is not due to nutrient deficiency. Herbicide timing should focus on the weed-free period between V1 to V10 stages. Most products are safe with rising temperatures. Side-dress nitrogen has begun on early planted fields, with 4 to 5-leaf corn in progress. Delivery coordination for UAN is advised.

Soybean planting is 65-85% complete overall. Wet soil has delayed progress, especially in Renfrew and Pembroke. Some replants are needed due to poor emergence and root rot. Early planted beans are emerging well, but growers must ensure herbicides match traited varieties to prevent crop damage. Clear records and field signs help avoid costly mistakes.

Spring cereals look uniform with no major disease issues reported yet. However, cereal leaf beetles may become a concern as T3 fungicide timing nears.

For more information about the cereal leaf beetle, please visit the Farms.com Field Guide Pest pages.