Last week we saw a decrease in daily temperatures and an increase in insect pests. There’s a range of foliar diseases and insect pests we’re scouting for this week and, we’re going to try to cover them all in this week’s agronomy update.
With confirmation in almost all counties south of I-70 in Indiana, southern rust continues to be a concern. The weather forecast does not favor southern rust development (forecast is for cooler temps; southern rust thrives at higher temps), yet we encourage you to still monitor fields. Treatment may be warranted depending on the corn growth stage, severity of the infestation and weather forecast.
Western bean cutworm
In the northern half of our footprint growers are finding western bean cutworm in fields that had below threshold egg mass levels. Once larvae has entered the ear control is very difficult. In most cases, it is too late to spray, but take notes of insect pressure to help select and place hybrids in the right fields next year.
We are seeing frogeye leaf spot, sudden death syndrome and white mold in soybeans fields. Treatment is warranted for frogeye leaf spot in situations of heavy infestation. Last week conditions were favorable for white mold development so keep an eye out for this disease. There’s not much we can do now for white mold and sudden death syndrome except select a strong disease-resistant variety for next year. In northern Indiana and Michigan we are finding an increase of northern corn leaf blight. Be sure to consult us on treatment decisions and selecting the best products for next year.
The window for alfalfa seeding is quickly approaching. Be sure to have your fertility and pH in check before the recommended seeding time frame of mid-August through early September. This Ohio State University article covers alfalfa seeding more in depth.
Stop by our booth at the Michigan Agro Expo, Aug. 15-16 and our annual Wabash field day Aug. 21-22. Contact us or your district sales manager for local field days near you.
If you’re seeing disease and insect pressure, give us a call to discuss management options. Keep track of the fields with pressure so we can select the best products for your fields next year.
Terry, Dan, Rod and Dennis