Walking Your Fields® Newsletter - South Delta and Coastal Plains
Many corn fields in our area are reaching the late grain-filling phases, with some early-planted fields close to physiological maturity. Keep an eye on your fields and be sure to keep irrigated fields moist until the black layer is visible. Black layer indicates that the plant has cut off nutrition and water to the developing kernel and that the kernel has accumulated all the weight possible. Early irrigation termination can lead to lower test weights and yields. Follow the milkline to monitor and predict black layer. Water stress during the grain-filling period can cause stalk integrity to decline as the plant transfers energy from the stalk to the ear to finish developing the kernels.
Solar Radiation Effect on Corn Pollination
The recent weather pattern has offered relief from water stresses during the peak water demand for corn. However, with this rain has come many cloudy days which limits the amount of sunlight and solar radiation required for photosynthesis. Incomplete pollination and reduced grain fill are some of the issues that can arise from reduced sunlight during the reproductive phase. Follow the link for details on the effect of reduced solar radiation on corn during critical corn growth stages.
Southern Rust Status
Southern rust was identified in early June 2017, but was slow to progress. The wet weather the last few weeks has caused the disease to spread, and now it is showing up in pockets across the Southern US. Temperatures less than about 95 degrees and storms moving through the area are a prime recipe for southern rust to proliferate. Southern rust can still damage corn past dent and up to probably half milkline. Growers with later planted corn, as well as those in our northern growing regions, need to be especially vigilant in keeping an eye out for southern rust. If you have a field with good yield potential that does not have the milkline visible and discover southern rust, it is suggested to spray that field again. When corn leaf area is infected and cannot intercept the required sunlight to fill the grain on the ear, the plant will cannibalize energy from other plant parts, mainly the stalk, in an effort to fill the grain which can result in lowered stalk quality.
Corn Yield Estimator
Follow this link to the Pioneer.com Agronomy portal to enter your own field information to get a corn yield estimate. This link works on mobile devices so that it can be utilized while in the field.
It is important to walk fields prior to harvest to identify any fields with stalk integrity issues so harvest schedules can be prioritized to eliminate any potential losses before the combine.
Soybean Growth and Pest Management
Early planted soybeans are well into the reproductive phases and several pest management sprays are needed during early pod set. Monitor growth closely to time pesticide applications for maximum returns. Fungicide sprays are most beneficial at R3 or beginning pod when pods are 3/16 inch at 1 of the 4 uppermost nodes. Most of the vegetative growth of determinate soybeans is reached by flowering, and long lasting residual insecticides are effective control for foliage feeding worm pests.
While soybeans that were planted early are into the reproductive growth stages, later or double-crop plantings are strictly in the vegetative phases of growth. Below is a chart from Mississippi State University for soybean water use and each of the significant growth stages throughout the season. Soybean irrigation should continue until the R6 growth stage when beans are touching within the pod.
Disease Watch: Conditions Are Right for Infection
Summer storms and environmental conditions are bringing southern rust and other diseases to southern fields. Other key threats are frogeye leaf spot, cercospora leaf blight, northern corn leaf blight and gray leaf spot. Apply fungicide on R1-R3 soybeans and VT-R1 corn to protect green leaf area and improve yield potential.
Stop Worm Feeding
It's prime time to scout and control foliage-feeding worms in soybeans, including soybean podworm, armyworms, cloverworm and loopers. Choose a proven broad-spectrum insect control solution, such as DuPont™ Prevathon® insect control, which can be used on a number of crops in our region to protect yield.
THANK YOU FOR READING!
Your DuPont Pioneer Southern Agronomy Team
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Encirca® services provides estimates and management suggestions based on statistical and agronomic models. Encirca services is not a substitute for sound field monitoring and management practices. Individual results may vary and are subject to a variety of factors, including weather, disease and pest pressure, soil type and management practices.
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