Foliar Diseases In Focus

The crop growth and development across our footprint remains inconsistent. There is some good looking corn and there are also a lot of thin stands, with disease and insect pressure. It is time to start monitoring all fields for potential issues with insects and foliar diseases. We address our main concerns in this week’s update, but if you have any other questions please give us a call.

Foliar diseases
Southern rust has been confirmed in isolated areas in the most southern part of our footprint and has been spotted but not confirmed in Indiana. Common and southern rust are easily confused, this Purdue Extension handout is helpful in distinguishing between the two. Southern rust has small, densely clustered, round to oval, light orange colored pustules; whereas common rust has larger, scattered in streaks, which are elongated, and brick-red in color. In the coming weeks we will be watching for northern corn leaf blight and gray leaf spot in corn and white mold, septoria brown spot and frogeye leaf spot in soybeans in fields across the region.

Southern Rust of Corn_070717

Insect pressure
Japanese beetles are in full force this year, however treatment is rarely warranted for this pest. Pheromone trapping counts for western bean cutworm moths remain high. Be sure to scout high-risk areas including sandy, light-textured soils and fields with a history of western bean cutworm. We suggest considering treatment when 5 percent of plants have egg masses and time insecticide application for when 90-95 percent of tassels have emerged. European corn borer is still on our radar, especially in conventional corn and Roundup Ready corn. We’ll soon be looking for second generation corn borer.

Nitrogen (N) loss
Saturated soils are at a risk for late season N loss due to denitrification and leaching. A late N application may be worthwhile in areas of abundant rainfall.

Contact us with any questions you have regarding these or any other agronomic topics,

Terry, Dan, Rod and Dennis