Case Details
corn foliar issues
Submitted by Scott A. Reuss on 9/23/2009
The symptoms shown in the pictures are showing up in various situations in Marinette & Oconto Counties this year. Most severe symptoms are on corn on corn on the drier soils. The pictured plants are from a field of Garst hybrids, in which about 60% of the plants exhibit some degree of these symptoms. Only areas without symptoms are on moister soils. I know that there are fungal leaf spot issues, but am mostly concerned about the interveinal chlorosis and what may be interacting to cause that.
Reply by Carrie Laboski on 9/23/2009
The chlorotic leaf margins appear to be K deficiency. You may see more symptomology on the lower leaves compared to upper. Dry soil conditions can sometimes induce a K deficiency because uptake is limited compared to moist conditions. Compaction can exacerbate K deficiency, again because of limited uptake. Soil test different places in the field (symptomatic and asymptomatic) and perhaps tissue test as well. Also use a soil probe to get a relative assessment of compaction in the different areas.
