Chlorotic spots at regular intervals on wheat seedlings

By Marco Peña

The Yuma integrated pest management team received wheat samples from Jim Ellsworth, a PCA in Yuma, Ariz.

The plants showed an injury or a discoloration evenly spaced on the leaves. In some cases there were double spots on the opposite side of the leaves but always the spacing was very even (about 0.5" apart).

The previous crop was lettuce and melons with different herbicide regimens. There was no defined herbicide drift pattern observed in the field.

The affected area was approximately 100 acres in Wellton, Ariz. The team determined it was due to abiotic factors discarding insect damage and disease symptoms.

Check out the symptoms in the following video recorded Jan. 11, 2012: "Wheat in Wellton AZ".

Contact Peña: (928) or marcop@ag.arizona.edu