Most of Missouri was able to plant corn in Mid-April, but Illinois corn planting did not take place until mid to late April in Western, Central, and Southwestern Illinois. Soybeans planted throughout May in Illinois, Missouri, and Iowa depending on rain. Some areas of Southern Illinois were not able to plant corn and soybeans until the end of May because of rain. Northern Illinois and Southern Wisconsin began planting corn late April, but mostly throughout May and finished up planting beans in early June.
May 5th - Uneven emergence of corn was observed due to fluctuating temperatures of soils.
Early season weeds such as waterhemp began to be observed when scouting fields in Missouri.
May 8th -Emergence issues due to soil crusting was observed in earlier planted corn in Illinois, Missouri, and Southeastern Iowa. Many Southern Illinois fields that were tilled, turned to a concrete consistency and were in need of a rotary hoes.
May 10th – Weeds such as cocklebur were coming on quick in Missouri.
May 11th – Hail Injury reported in North Central Missouri and Northern Missouri received heavy rain.
May 12th – Cutworm injury was found in Central Missouri.
Fomensafen herbicide injury in corn was being reported in Missouri.
Much needed rain and warmer weather was received and made a “world of difference” for uneven corn stands due to cooler temperatures. The rain also softened soil crust and allowed for easier emergence of corn.
May 13th – Hail injury in Missouri was evaluated and most of this corn’s growing points remained underground; therefore, crop appeared to be “growing” out of the injury. Agronomists strongly discouraged the use of fungicides on hail injured corn.
May 15th – Uneven emergence due to planting depth issues was observed in Western Illinois.
May 16th – Reports of frost injured corn in Northern Missouri and most of this corn appeared to be fine after evaluation.
At this time, there had been 7 straight days of rain for areas of Southern Illinois, and they still were not able to plant corn.
Frost damage occurred to corn and soybeans in Northwest Missouri. The frost injured corn was evaluated in Missouri, and even though they looked horrible, the growing point of corn remained alive.
Most of the frost injured soybeans did not fare so well. Soybean growing points were injured by frost in Missouri.
Areas of Northern Illinois actually received some snow and luckily, very, little corn was planted there at that time.
Cooler temperatures were now a concern for soybean emergence in Missouri and Illinois.
May 19th – Armyworm concerns in Southern Illinois and Central Missouri. There were some larvae found in Central Missouri, but they appeared to be “Look-alikes” and not true armyworm.
May 20th – PPO injury to soybeans began to be reported throughout Illinois on soybeans that emerged in cool temperatures, which caused herbicide metabolism issues.
Marestail control in emerging soybeans began to become an issue in Illinois.
Lightning bugs and cottonwood tree shed also was an indication of the beginning rootworm egg hatch.
Golf ball sized hail reported in the Chicago, IL area.
May 21st – Golf ball and Grapefruit sized hail reported in the Tuscola, IL area and flooding occurred in areas of East Central Illinois.
Newly emerged corn in Northern Illinois was yellow due to cool temperatures and had signs of being slightly frosted.
Heavy rains after soybean planting caused many fields to have crusted soil at emergence. Areas of Missouri and Illinois scrambled to find a rotary hoe.
ALS herbicide injury was observed in corn.
May 23rd – Nitrogen burn observed on corn roots.
Warmer weather finally arrived so that corn could “take off”.
Armyworms were reported in Southern Illinois and Missouri.
Concerns with yellow striped and purple corn – (Some hybrids genetically have a yellow stripe to the foliage). Some of the “stressed areas of the field” (compacted, low lying, waterlogged) with less developed roots, show signs of sulfur, manganese, and phosphorous deficiency; however no worries, symptoms will clear up with rain, sun, and as the corn plant develops a nodal root system.
Potato leafhoppers were a concern in alfalfa.
May 28th – Foxtail and crabgrass (below) weed emergence was reported.
Wild Turkey and Deer injury was observed in fields.
Earlier planted corn finally made the transition from seed support to a self-supporting plant, thanks to nodal roots. Corn growth started to go crazy!
May 30th – Suspected corn nematode problems evident in a corn field that had previously been a pasture.
Post herbicides and side-dressing of NH3 started to take place on earlier planted corn. Areas that had been drown out in Southern Illinois were now dry enough to finally plant corn and soybeans!
Concerns of drought in Missouri, while areas in Illinois continued to get hammered with heavy rains.