By Jeff Shaner | Seed and Technology Manager
Stalk rot diseases occur in nearly all corn crops, leading to approximately 5% yield loss per year. Stalk rots can be more commonly found in high-yielding hybrids that produce large and heavy ears.
Prior to 2019 planting, AgVenture published an update on the advancement of tar spot across the Midwest. As of last week, AgVenture Corn Product Manager Darren Bakken has seen the disease move as far west as Boone County, Iowa.
As harvest begins, it is important to continue scouting fields for diseases, including ear rots.
Brown stem rot may be the culprit of yield losses in the western Corn Belt. Recognizing brown stem rot isn’t easy as symptoms are not evident until late in the growing season.
The soybean stem borer (Dectes texus) is a long horn beetle that can cause lodging in soybean plants, resulting in harvest difficulties and significant yield loss.
A successful harvest depends not only on crop conditions, but also on properly functioning equipment.
An important part of corn silage production is proper and timely harvest management.
Wet and cool conditions during flowering are ideal for development of the fungus Sclerotinia sclerotiorum.
No variety is completely resistant to white mold, particularly under severe disease pressure, but differences in tolerance exist among varieties.
Tar spot is a fungal leaf disease that infects corn leaves and causes lodging and yield losses. First confirmed in 2015, it has rapidly spread in persistence and reach. Yield losses from tar spot infection can be severe.
Corn and soybean planting season may have been extreme, but there are many benefits to seeding alfalfa this time of year. As alfalfa stands age, yield potential declines.
Downy mildew or crazy top is a condition that often results in wet or flooded fields. A crazy top results when plants are infected by Sclerophthora macrospora at flooding.
Erwinia chrysanthemi pv. zeae is one of the most common causal agent of bacterial stalk rot. It is readily capable of establishing and thriving on corn and sorghum plants as it enters natural openings or wounds made from weather or pests.
Goss’s wilt has rapidly become a significant and yield-reducing disease.
One ear rot taking hold in many fields is Diplodia ear rot. It tends to thrive when there is wet weather and mild during grain fill. Upright ears with tight husks may promote Diplodia development in certain conditions.
Every year, a variety of diseases, fungi, and molds are present on ears as plants near harvest. Correctly identifying what culprits are present may influence your harvest prioritization, grain management and handling, or even next year’s cropping plan.
Late season rains are hard on crop root systems. Standing water can cause suffocation-like conditions where oxygen deprived soil cause death to plant roots and subsequent deterioration of above ground foliage.
Take a look at your spray tips before you hit the field again. A few quick checks can help ensure all tips are operating unimpaired. Be sure all tips are spraying uniformly across the boom. Check to be certain all are calibrated correctly and uniformly.
Various species of stink bugs cause a range of crop damage. In soybeans, they typically do not produce damage enough to warrant treatment while soybeans are in the early reproductive stages.