Recently, we’ve seen several farmers sharing what they’re finding in their cornfields this year. The ears don’t all look the same, but many of these problems may point back to one common factor: drought and heat stress during critical stages of corn development.Drought Has Already Hurt the Corn. Can Drones Help Protect What’s Left?
One common symptom is an ear that has developed normally in size but shows poor kernel set, tip-back, or kernels that failed to develop properly.
Corn is especially sensitive to water stress during tasseling, silking, and pollination. Under severe drought, the tassel may begin shedding pollen while silk emergence is delayed, creating a mismatch between pollen shed and silking. Even when pollination occurs, continued water stress afterward can cause some developing kernels to abort.
The result can be an ear where some kernels develop normally while other areas remain unfilled or contain kernels that stop developing early.
Another situation is when a corn plant produces two ears, but the second ear remains very small and develops few or no viable kernels.
Seeing two ears on a plant might look like a sign of higher yield potential, but that isn’t necessarily the case.
Under favorable conditions—with sufficient moisture, nutrients, and photosynthetic capacity—a second ear may contribute to yield. But under drought or other stress, the plant has limited water and carbohydrates available and will generally prioritize the primary ear.
As a result, the main ear continues filling while the secondary ear may stop developing or abort entirely.
So although these two situations look very different in the field, they can tell us something similar:
Final corn yield depends not only on plant size or the number of ears produced, but also on whether the crop has enough water and resources during critical stages such as pollination and grain fill.
For rain-fed cornfields without irrigation, severe drought during pollination can cause yield losses that later management simply cannot reverse.
But that doesn’t mean there is nothing left to manage.
Once drought has reduced a field’s yield potential, the question becomes: How do we protect the yield that is still there?
Drought-stressed corn can still face additional losses from insects, foliar diseases, and ear diseases. During grain fill, protecting healthy leaf area and the kernels that have already developed can still be important for final kernel weight and harvestable yield.
This is where agricultural drones can play a role.
Drones cannot make it rain. They cannot replace irrigation where there is no water source, and they cannot bring aborted kernels back.
What they can do is help farmers scout fields quickly, identify differences in crop condition across the field, and—when pest or disease pressure justifies treatment—provide timely and targeted crop protection applications. In tall, fully canopied corn, drones can also reduce the need to drive large ground equipment through the crop and avoid some of the associated crop damage.
Most importantly, after a drought, the management objective may need to change.
The goal is no longer to recover yield that has already been lost. It is to protect as much of the remaining yield potential as possible.
In other words:
Drones can’t solve drought. But after drought has taken its toll, they can help farmers identify problems sooner, respond to pest and disease pressure more quickly, and protect the yield that remains.
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