From the Field Updates
The past week has been very productive in Wisconsin. According to the USDA Crop Progress Report, corn is at 78% planted in Wisconsin, which is up 20% from last week. Soybeans are at 60% planted, up 26% from last week. The crops that have emerged are off to a slow start, due to the lack of sunshine and the abundant rainfall. On a normal year, V5 corn is 12 inches in height or greater, but this year we are seeing V5 corn right around 8 inches tall. With the soil drying out, roots are no longer drowned out and now nutrient and natural water uptake is more available to the plants. With that, it’s time to start making in-season fertility decisions within your operation. Tissue sampling is a management practice that Landmark has been progressively growing each year and it’s showing positive results. The best time for early tissue sampling is between V5 to V8 growth stages in corn, and V3 to V5 stages in soybeans. If you are interested in learning more about tissue sampling, talk with your Landmark agronomist.
We are also at the point where we are starting to see waterhemp emerging. It’s one of the hardest weeds to control in our area, with its six documented chemistries it is resistant to. The best control method for waterhemp is having residual herbicide so you never give it the chance to come out of the ground, but with a year like this, that’s not the case for many growers. The next best option is to target small waterhemp plants that are less than 4 inches tall but note that waterhemp has one of the highest relative growth rates at 1-1¼ inches per day, during typical growing conditions. In corn, there are plenty of strong chemistries to control but in soybeans, it’s a bit trickier. If you are planting Xtend or Liberty Link soybeans, you have much stronger options than conventional and Roundup ready soybeans. But still shouldn’t wait until it’s too late!
Have a great week!
With the last of the corn and most of the beans being planted, now is the time to get out there and spray soybeans. Getting a soybean pre-emergence herbicide is an important step in waterhemp and weed control. After soybeans emerge, there is a limited number of chemicals to spray on them to control tough weeds like waterhemp and get good residual control. Starting with a good residual chemical and following that application in-season with another residual chemical, is the best way to try and control waterhemp. Talk to your Landmark agronomist which bean spray program would work best for you and your farm.
Have a great week!
This week, field activity continues in many directions. Rain events were spotty, with about 0.1-inch on June 5th, and trace amounts on June 8th and 9th. Rain forecast for Tuesday, June 11th, has us all running to get things done.
Several days of temps in the 80s accumulated some growing degree days, though we are still behind compared to last year at this time by about 100 GDD. Monday and Tuesday followed with temps in the 50s, and overnight soil temps continued in the 50s.
Insect development has been slow, so watch your fields for cutworm and armyworm damage because almost all corn is late emerging this year and is the most vulnerable to these pests. Wisconsin says that 78% of the corn is planted, still not much has emerged yet. Soybeans statewide are 60% planting with less than 10% emerged. The equinox comes about June 21st and late planted soybeans responding to day and night length will reply with changes in growth height and reproductive stages. Late planted beans should be the same full season variety as planned until June 20th and planted at increased populations to help achieve full potential for height and yield.
With a few days of sunshine, high pressure, and low humidity, farmers responded with hay making and chopping. Flat tires and breakdowns are not welcome during this time and stress tension levels are still high among farmers.
As we move forward this week, corn side dress nitrogen operations will begin, and herbicide spray programs may change from PRE spray to POST spray as crop delays and fast emerging seedlings require change in chemical treatments.
Many corn fields this year are getting topdressing applications with urea to supply nitrogen that we were unable to apply earlier due to rain delays.
With most “prevent plant” decisions made, now is the time to consider making the most of your crop with fungicide and foliar fertilizer products. Scout for insects and be prepared to control them to protect your yields.
Watch for soybean aphid populations as they develop in small soybeans. 250 aphids per plant is the economic threshold for treatment. Although, if populations are growing early (before mid-July), consider spraying. If aphids increase this year, they usually crash populations and activity by August 8th. Anytime within that window is appropriate for spraying to control when populations are heavy.
The last of weed control sprays were made on wheat fields this week. Going forward, depending on environmental conditions, it might pay to spray fields with fungicide.