Why do I have Physoderma in my corn when I post applied fungicide? Although fungicide may have been utilized it is NOT specifically labeled for this disease. Physoderma brown spot and stalk rot is common. Some products are just NOT labeled.
Hybrids have differing susceptibility to this crippling disease, and crop debris and soils can host it for 2 – 7 years. Corn is most susceptible to infection between stages V5 to V9. It becomes visually prominent and can affect standability at reproductive stages after VT.
Which variety will perform best in 2020? I recommend spreading risks with a minimum of five varieties. In August field walks be investigating insect pressure, leaf color, cob quality, kernel depth, kernel count, stand counts, and stalk quality. Planning for 2021 planting began when the planter dropped its first kernel in 2020.
The common denominator for corn issues in 2020 has been residue. Fight back this fall with the following:
Does faster emergence with Hefty Complete really matter? Yes, emergence pays. During a recent pre-harvest field walk, in a parcel with three different varieties from the same planter on the same day, there was a visible difference in emergence.
Hefty Complete: Chalk line ear placement 100% brown silk.
Competitor: Some silks not yet brown and erratic ear placement.