Submitted by John Heard, Soil Fertility Specialist, Manitoba Agriculture
Classic symtoms of copper deficiency on soils likely low in copper are:
· twisted leaf tips
· sandy, low OM , high pH soil with known low copper levels
Or could it just be environmental stress due to frost injury, lack of moisture and drying winds?
A tissue test is needed to confirm copper deficiency as the culprit.
Studies in Manitoba compared three timings of foliar copper sprays on deficient spring wheat and showed that copper deficiencies and impact on yield can be severe or slight and can vary from year to year.
Timing and application method are important to regain yield! For more information and pictures on copper deficiency, see the full .pdf copy of Copper Deficiency in Wheat