Deficiency: leaves will pale, appear fringed and scorched. wierd leaf patterns. Yellowing of middle leaves. twisted younger leaves. this is commonly mistaken for a N deficiency, generally starts on older growth, and moves to newer growth. this usually happens when sulfur and phosphorus are deficient. Severe Mo def will appear as pinkness/orange color to leaves.
Yellowing of middle leaves. Foliar feed with chemical fertilizer containing Mb.
Picture 1 and 2 is a Molybdenum deficiency in late flowering