Southeast Minnesota crops are progressing

Southeast Minnesota crops are progressing in spite of a back and forth weather pattern. It’s gone from hot to cool and dry to wet multiple times this spring, and, for the most part, the crops have gotten enough water at the right times to continue development.

Southeast Minnesota Crops are Progressing

Southeast Minnesota corn that didn’t need to be replanted because of wet weather is now at tasseling stage, when wet weather becomes a little more critical for continued development. (photo from cornbeanspigskids.com)

The corn crop is coming into the tasseling stage, a critical time in the crops’ development. Fillmore and Houston County Extension Agent Michael Cruse said the ten days before tasseling and the two-week period afterward are when rain becomes critical to continued development for southeast Minnesota crops.

“The corn is working on set and going through the reproductive cycle,” said Cruse, “and it’s important that we get rain. If the water gets limited by dry weather during that period, it will limit the crops’ final yield numbers.”

There is some extra water in the soil profile from rainfall this spring and early summer, which Cruse says doesn’t hurt at all. However, after talking with several farmers in the area, Cruse said several had to go into their fields when it was probably too wet. The farmers told Cruse they were concerned about compaction in their sidewalls when they were planting.

“That means the roots weren’t able to grow out and down into the soil like they typically do,” Cruse said, “so even though we do have water in the soil profile, if people had that type of compaction issue in their fields, the roots won’t get down to the water that’s there. It’s possible that water will be limited for the crop, even though there’s water in the soil profile.”

Though we did get plenty of rain at times this spring, Cruse said it messed up a lot of the timing for getting out in soybean fields and spraying herbicides. There are soybean fields in southeast Minnesota that have weed infestations that they couldn’t get into and spray. Farmers had to try and hit ragweed when it was 2 – 2.5 feet tall.

Southeast Minnesota crops are progressing

Due to wet conditions, it was tough for southeast Minnesota farmers to get out and spray soybean fields at the correct time for maximum weed control. (Photo from ottofarms.com)

“They had to put something down that not only burned the weeds but hit the soybean plant as well,” he said. “That’s okay, but all you really did was burn the leaves on the weeds. Most of the time, you won’t kill them by doing that. If you did knock the ragweed back a little, they’re greening up and shooting out more buds. They’re not really under control and still growing.”

Cruse’s extension colleagues are telling stories about soybean fields in their areas that were incorrectly sprayed. Farmers sprayed the incorrect product on soybean fields that aren’t resistant to that specific chemical. There have actually been soybean fields in Minnesota that were completely killed off.

“There were some fields that may not have been completely killed off,” Cruse added. “But beyond even that, the other concern is are we getting enough growing degree days? We’re actually pretty close to average. We may be a little behind the last couple of years, but we’re close to average.”

Similar to corn and soybeans, this year’s alfalfa crop is a mixed bag, with some good and some not-so-good results. The biggest comment that Cruse is getting from farmers is problems dealing with winterkill.

“I’ve seen plenty of it that’s down and I’ve seen plenty that’s ready,” he said. “I’ve seen people that are constantly cutting alfalfa. But, other fields are slower than others, likely due in part to winterkill. It’s all over the board.”

Southeast Minnesota Crops Progressing

University of Minnesota Extension educator Michael Cruse says even though southeast MN crops are progressing, some alfalfa fields have struggled to be productive because of late season winter kill. (Photo from Michigan State Extension)

Disease pressure has been somewhat limited so far in southeast Minnesota crops, but Cruse said they’re likely going to show up in the immediate future. This is the time of year to be scouting for diseases like Northern Corn Blight.

As far as pest pressure, Cruse made an interesting point, asking, “How many mosquitoes have you seen this year?” What makes it even stranger is we’ve had plenty of the right conditions to have a lot of mosquitoes, but they just aren’t there in numbers we’re used to.

“We may have an infestation here and there,” Cruse said, “but I haven’t heard anything that’s overly concerning about southeast Minnesota crops, at least up to this point.”

 

 

 

November Weed of the Month: Palmer Amaranth

November’s Weed of the Month is Palmer amaranth (Amaranthus palmeri). This fast growing weed has developed resistance to multiple herbicide modes of action so it is difficult to control. Palmer amaranth produces a lot of seed, up to 250,000 per plant, and is highly competitive. It spreads quickly and will cause extensive corn and soybean crop losses.

Palmer amaranth is native to the arid southwestern United States and northwestern Mexico. It was accidentally introduced to the southeastern United States and became the most troublesome weed in cotton production, by far. It developed resistance to many herbicides with multiple modes of action and spread to row crop fields in much of the eastern half of the country. This dreaded weed was discovered in Minnesota in 2016.

Palmer Amaranth weeds

Palmer amaranth plant with seed spikes. (photo provided by the Minnesota Department of Agriculture.)

Palmer amaranth can be distinguished from closely related waterhemp and other pigweeds by a long petiole length and very tall flower and seed spikes. Unlike other pigweeds, Palmer petioles are often longer than the leaf blades. A petiole attaches a leaf to a stem. The flowering spike is much longer than that of other pigweeds. Leaves of some Palmer plants have a whitish V-shaped mark on them. Palmer amaranth is a summer annual that commonly reaches heights of 6-8 feet but can reach 10 feet.

If you find this plant, please report immediately by calling the Arrest the Pest at 888-545-6684 or emailing arrest.the.pest@state.mn.us.

Palmer amaranth detected in Minnesota

 ST. PAUL, Minn. – Crop scientists at the University of Minnesota and officials at the Minnesota Department of Agriculture (MDA) urge farmers to check fields for Palmer amaranth, an aggressive weed that can put corn and soybean crops at risk. A plant detected in a native seed planting plot on a Yellow Medicine County farm was confirmed today to be Palmer amaranth. This is the first confirmation of the weed in the state.

The MDA asks possible infestations to be reported by contacting the MDA’s Arrest the Pest line by phone at 1-888-545-6684 or by email at arrest.the.pest@state.mn.us. Landowners are encouraged to email photos of suspected infestations for identification.

“We encourage landowners to scout fields now before harvest for Palmer amaranth and report any possible infestations to the Minnesota Department of Agriculture,” said Geir Friisoe, MDA’s Director of Plant Protection. “The quicker we’re able to identify and start managing this weed, the better our chances will be to minimize the impact to our ag industry.”

Palmer amaranth

Palmer Amaranth has been found in Minnesota and the Department of Agriculture wants farmers to keep an eye on their fields to help nip this in the bud before an infestation can occur. (Photo by Bruce Potter)

 

Palmer amaranth can grow 2 to 3 inches a day, typically reaching 6 to 8 feet, or more, in height. Left uncontrolled, a single female Palmer amaranth plant typically produces 100,000 to 500,000 seeds. It is resistant to multiple herbicides.

It has been found in 28 other states, including Iowa, South Dakota, and Wisconsin.

“Palmer amaranth infestations have caused substantial yield losses and greatly increased weed management costs in cotton, soybeans, and corn in the southern states,” said Extension agronomist and crops leader Jeff Gunsolus. “This is a disconcerting, though not completely unexpected, discovery in Minnesota. We have been discussing proper identification procedures with crop consultants over the last three or more years.”

Close-up of Palmer amaranth

Palmer Amaranth has been found in Minnesota fields and it’s important for farmers to watch their fields in order to avoid an outbreak in farm fields across the state. (Photo by Bruce Potter)

 

Extension and MDA officials commend the grower and crop consultant who quickly contacted Extension after discovering a suspected Palmer amaranth plant. The weed is on MDA’s prohibited-eradicated noxious weed list, requiring all above- and below-ground parts of the plant be destroyed. Transportation, propagation or sale of the plants is prohibited.

MDA and Extension continue coordinating action steps to address the weed.

The MDA is investigating how the weed may have been introduced to the state.

In August, an Extension blog updated steps for both prevention and management at z.umn.edu/palamthbknd.

Further information is available at z.umn.edu/MDAPalmerAmaranth.