Give an example of a fungal-caused plant disease that can be effectively reduced by fertilizing with a micronutrient. Name the micronutrient and explain why it helps control the disease. Two...

Give an example of a fungal-caused plant disease that can be effectively reduced by fertilizing with a micronutrient. Name the micronutrient and explain why it helps control the disease.

Two Aridisols, both at pH 8, were developed from the same parent material, one having restricted drainage, the other being well drained. Plants growing on the well-drained soils showed iron deficiency symptoms while those on the lesswell-drained soil did not. What is the likely explanation for this?