From the Field 6-17-2020

Southern territory field report with Billy Agnew

Hello, and welcome to this week’s edition of From the Field. The weather over here has been great the past few weeks, giving us good windows for post herbicide and sidedress applications. Most corn is at V4-V6 growth stages, a crucial time in the plant’s development when the uppermost ear and tassel is initiated and the number of kernel rows (ear girth) is determined. Any stresses at this time will impact that crop’s end yield. For this reason, we recommend plant tissue analysis to determine the total elemental content of the plant. Tissue analysis helps serve as a check on your fertilizer program, or can be used as a troubleshooting tool to determine nutrient deficiency. We still have time to make in-season adjustments to maximize yield. Contact your Landmark agronomist if you’re interested in having tissue sampling taken on your farm.

On the soybean side, we’re seeing the emergence of waterhemp, which is a hard-to-control weed that’s resistant to six herbicide chemistries. The best control method for waterhemp is having residual herbicide, so you never give it the chance to come out of the ground. If it does escape, the best option is to target small waterhemp plants under four inches tall—but note that waterhemp has one of the highest relative growth rates at 1-1 ¼ inches per day during typical growing conditions. Also remember if waterhemp gets to seed, one plant can produce up to 1,000,000 seeds. It’s very important to scout your fields to stay on top of what’s happening, so you don’t have any surprises come harvest.

If you have any questions or concerns, make sure to reach out to your local Landmark Agronomist. Have a great week!


With post-spraying in full swing there are a lot of things to look for when scouting your fields. Not only should you look for weeds species and pressures but also diseases and nutrient deficiencies. During your post application, it’s a perfect time to add a foliar feed or fungicide while making your herbicide pass. Tissue sampling is available to pinpoint any nutrient deficiencies and how severe they may be. Please reach out to your Landmark Agronomist to assist you with your scouting needs. See below for guides on scouting for corn diseases, nutrient deficiency, and leaf diseases.

Scouting for corn diseases

Nutrient deficiency examples

Corn leaf disease chart