– Symptoms are difficult to detect in the field, particularly early in the season.
– At low levels of N, the crops are pale with some limpness.
– As N levels increase, symptoms become more specific with all but the oldest leaves pale green with adequate to high levels of N.
– Middle leaves have a speckled flecking or yellow stripes.
– Leaves appear limp and water-stressed.
– Tip scorching of old leaves apparent at high N levels.
– Severe deficiency causes delayed maturity and empty heads.
Control: