Triazines are nonselective herbicides that are used for control of annual and perennial grasses and broadleaf weeds. These products are translocated in plants in the xylem. Older leaves show the first symptoms. On broadleaf plants, these symptoms appear as a leaf tip, marginal, or interveinal chlorosis or necrosis of leaf margins. On conifers, damage appears as needle tip chlorosis or necrosis. Damage may be more pronounced with higher temperatures. Triazine damage resembles that caused by dichlobenil (Casoron). These products can persist in the soil for most of the growing season or from one growing season to the next. Triazine damage rarely causes veinal chlorosis (yellowing of veins and adjacent tissues), which may instead be caused by long-term residual herbicides.