From the Field 7-29-2020

With pollination in full swing, there are a couple of things to keep in mind with your corn and soybean crops. First, make sure you know what stage your crops are in. Second, be able to identify yield-robbing disease and insect pressures. Apply fungicide and add insecticides where needed. Contact a Landmark agronomist to help identify any issues so we can help maximize your yields. I’m providing a few slides to help with distinguishing growth stages of crops and as well as the identification of insects that you’ll see this time of year and the damage they cause.

Soybean growth chart

Soybean Terms

Corn Growth Chart

Japanese beetles, aphids damage

Corn Rootworm Beetles



Southern territory field report with Billy Agnew

We made it to the finishing stretch—corn and soybeans are in their reproductive development stages and look exceptional, for the most part. This doesn’t mean it’s time to take a vacation until harvest; there are still risks in the fields we need to keep an eye on. In corn, a few things we have started to see in fields are disease and insect feeding.

Gray leaf spot and tar spot are a couple of diseases we’ve seen popping up these past few weeks, and both can cause 50% or greater yield loss with severe infection. We still have time to set up an aerial fungicide application where we can apply a fungicide to help that corn reach its full yield potential. Another important thing to keep an eye on is insect silk feeding from adult corn root worm beetles and Japanese beetles. If corn is still pollinating and silks are full of insects, or silks are clipped a half an inch or less from the ear, contact your local Landmark agronomist to access what steps can be taken.

On the soybean side, insects continue to be at the top of our radar. We expect soybean aphid numbers to continue to grow. For that reason, we recommend that when a soybean field is treated with herbicide or fungicide, an insecticide should also be added for residual protection. In addition, we expect to start seeing soybean disease showing up in fields. When the fields canopy, it creates a microenvironment suitable for disease. Fortunately, Landmark has great options for fungicide treatment to protect your soybean health.

As always, have a safe week and contact your local Landmark agronomist with any inquiries.