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.
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.
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.
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.
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.
Trap counts often spike late in July as fall army worm moths take flight. Their larvae feed on crops causing defoliation and crop damage. With much of the crop going in late this year, AgVenture encourages growers to be on the lookout for the pest.
Nitrogen (N) stress at any time in a corn plant’s growth and development subtracts from yield potential. Knowing how much N is available is critical to high-yield strategies.
With late planting occurring in many areas, growers are seeing seedcorn maggot feeding. They prefer decaying organic matter, but also feed on seeds and seedlings of soybeans and field corn.