Gall midge is a relatively new soybean pest, and reports in the northern Cornbelt indicate early infestations, especially along border rows. Adult midges are small (2-3 mm in length) and have long antennae and hairy wings.
Waterhemp has begun rapidly establishing itself as soil temperatures rise. Many growers have already applied a pre-emerge herbicide.
Have you talked with your AgVenture Yield Specialist about the Maximum Profit System™ (MPS)?
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.
Nitrogen (N) is the most commonly applied nutrient and one of the costliest inputs in corn production. N application averages 18% and 13% of the variable costs in a corn-corn and corn-soybean rotation, respectively.
When soybean fields are flooded, oxygen available for respiration is limited.
While the growing point is just at or below the soil surface (prior to V5-V6 stage), corn can only survive two to four days in totally saturated soil conditions.
The National Weather Service maps for May indicated sufficient to surplus soil moisture levels across most of the country’s corn and soybean growing regions.
Recent research shows that under good conditions, daily yield losses for soybeans are 0.3, 0.4, and 0.5 percent per day of planting delay for the first, second and third 10-day periods in May. Total yield loss potential mounts to roughly 15 percent by the end of the month.
Intense rainfall followed by warm and windy conditions tends to rapidly dry the surface of soils causing, in some cases, severe soil
crusting. When those conditions precede crop emergence, stand establishment can become compromised.
Uneven emergence, skips, doubles, and uneven spacing all reduce corn yield potential. The later a plant emerges relative to the plants next to it, the less that plant will contribute to overall yield. Those plants tend to stay behind throughout the season.
Stressed plants are more prone to postemergence herbicide injury. Carefully read and follow product labels when selecting spray additives to include with postemergence herbicides.
They are hard to diagnose. Seedling disease symptoms may be caused by multiple factors including the presence of more than one disease, insect feeding, herbicide damage, planting problems, the weather and environment in which they are planted.
Many growers are experiencing conditions ripe for slug damage.
Black cutworms feed on newly emerged and young corn plants, causing damage, stress, and the clipping of seedlings. Carefully monitor fields for black cutworm activity.