Received numerous alfalfa questions about browning and wilting of leaves/stems. This photo shows those symptoms of frost/freeze damage.
Check the upper-most cluster of buds on alfalfa to determine any affects on regrowth. This is where the growing point is located. Most of the alfalfa plants I’ve observed have healthy buds. With the cool temperatures, regrowth has been delayed. You may need to wait 7-14 days after the frost/freeze event to determine if regrowth is occurring from upper buds or from crown buds-and also to determine if an early harvest is warranted if there’s no regrowth from upper buds. More information on alfalfa frost damage and management considerations.
I’m also observing alfalfa weevils in low numbers in alfalfa fields. It will be important to scout your fields and monitor regrowth for second cutting. More information on alfalfa weevil thresholds.
Soybean planted April 21 at 2″ depth with good growth (I should have removed the soil from the root for this picture-did so after taking it and the root is healthy). Corn planted April 24th, 48 hours prior to cold rains in Clay County, showing beginning germination and a healthy seed. More information on potential chilling injury to corn and soybean seeds.
Cooler temps last week slowed stripe rust of wheat which I found in low incidence April 26. Powdery mildew (gray/white spots in this photo) is still moderate-heavy in lower canopy. April 6th was a beautiful day when I was in the area looking at crops, but with so many wheat fields with herbicide apps in that time-frame, I didn’t walk into fields to know how close wheat was to jointing. Since then I’ve noticed a more sprawling growth to wheat instead of erect. This week I’m noticing thicker than normal nodes where wheat is trying to erect itself-and you can see that in this photo with the bent stems. I’m not observing noticeable damage from frost/freeze at this time thankfully. It will be important to watch as heads emerge for any difficulty emerging from the boot, damage to awns, or white colored florets/heads.
Germination of corn in York County Corn Grower plot planted April 22. Soil temperature in the field that morning was 46F with a weekend of warm air temperatures.