This area has not seen rain in over two weeks and is not forecasted again until 9/6. Disease presence is still low as a result. The dry conditions were exacerbated by high temperatures (upwards of 97 degrees F) last week, which we will see again this weekend. Corn is dented (R5), and soybeans are at R6. Many corn ears exhibit tip back, likely due to dry conditions around pollination. Driving around, I have observed many fields with significant weed pressure, which hopefully serve as a reminder for increased diligence on weed control next season.

Crops in McLean and Woodford County faired better in last week’s heat than other areas. Moisture would be helpful to get through next week’s return of heat.

Crops in areas with less moisture haven’t matured as much as give up on life after the heat. Shanks have weakened, dropping ears, and ceasing grain fill. Black layers showed up in fields unexpectedly.

It was a hot one and the early planted/earlier maturity corn and soybeans are starting to turn quickly. Corn is 1/2 to 3/4 milk line depending on maturity. Thus, far grainfill seems to be just fine, but would really like some rain to finish out the season. Many have started to watch out for stalk rot to know which corn fields to harvest first. Cercospora leaf blight started to show up in soybeans.

This week, I visited fields in southwestern Vermilion County. Disease levels in both corn and soybean fields was minimal; I observed only a few isolated areas in soybean fields with foliar disease symptoms. Soybeans are mostly at R6 (full pod), but a few fields were still lagging behind closer to R5. Corn fields I visited were in early to mid-R5 (dent). Ear fill was good in most fields I check, but I did find a couple fields that are struggling, with varying degrees of tipback as well as kernels aborted later in seed fill.

Recent high day and nighttime temperatures have local farmers and crops stressed. In my immediate area in Northeast Illinois the opportunity for “Bonus fill” of kernels experienced last year appears very unlikely as the R6 (dent) corn hastens to maturity. Fields with greater water holding capacity are faring much better than lighter soils, but even those are showing some remobilization of nutrients from lower leaves in the canopy for the ear. Soy are nearing R6, having a green seed filling the pod at one of the top 4 nodes on the main stem with an open trifoliate.

Much needed sunshine returned and with it HEAT. Pod shed was seen in many fields after an overcast and fairly wet previous 10 day stretch. SDS continues to show up in many fields. Reports of white mold are starting to trickle in as well. Corn is 1/2-3/4 milk line. This heat will speed up maturity. Local elevator tours showed an estimated average of 215 bu/acre.

Here in my 3 county area (DeWitt, Macon & Piatt), soybeans for the most part are in Full Seed or R6 stage. Most all corn fields are in the Dent or R5 stage with the milk line clearly visible. Soybean Vein Necrosis Virus (SVNV) is showing up in area fields should not affect yield and is caused by juvenile soybean thrips damage earlier in the season.

Extreme heat starting today. Earlier planted corn is 1/4-1/2 milk line so I would anticipate less damage to it. Later planted corn is not dented yet, there could be damage done resulting in major tip back.

Soybeans have potential. Lots of pods, mostly 3 beans each.
Corn is very variable. You name it- it’s out there. Great ears. Short ears. Normal ears. Unpollinated ears. No ears. Tipped back ears. Next week and the high temperatures are a concern. The corn has been repeatedly stressed. Will it actually reach maturity or just up and die? Probably some of both.

I visited fields in western Champaign County this week. Soil conditions are starting to dry in the top inch or so, but there is still plenty of moisture below the surface. Disease in both corn and soybean fields appears to still be minimal. That said, I did come across a couple small pockets in two soybean fields with symptoms consistent with sudden death syndrome. Soybeans are between R5 (beginning pod) and R6 (full pod), with new growth still occurring. Corn fields I visited were in late R4 (dough) into R5 (dent). Representative ears from different fields showed variable ear sizes and degrees of tipback.