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Leaf Yellowing (physiological - various causes)

Injury by the herbicides Krovar (a mixture of diuron and bromacil) or Hyvar (bromacil) can cause yellowing [Picture]. Magnesium deficiency causes yellowing of the leaf, except for a lanceolate area along the petiole [Picture]. However, this type of yellowing can also be caused by iron or zinc deficiency, or it may be a consequence of foot or root rot.