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.
Numerous cases of Frogeye leaf spot have been reported in fields of susceptible soybean varieties. Circospora sojina is the fungus that infects leaves, stems and pods. Warm, humid and rainy conditions favor rapid development of infection.
Growing Degree Day (GDD) accumulations can help growers monitor stalk borer hatch and movement by using GDD accumulated with a developmental threshold of
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.
Once alfalfa plants have 3-4 inches of new growth, stand health may be assessed by randomly selecting sites throughout the field. You want to see a minimum of 4-5 alfalfa plants per foot.
Here is an easy test to help determine if soil is ready for planting.