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PHOTOSYNTHESIS INHIBITORS Family: Triazine Example: Atrazine (several product names), cyanazine (Bladex), simazine (Princep), hexazinone (Velpar) Crop Use: Corn and alfalfa Movement: Upward from root to vine Potato Injury: Carry-over injury has generally occurred in Nebraska when metribuzin at its high, labeled rates is also used on a field after triazine-treated corn in Nebraska. Recommendations are to use metribuzin at half rate under this circumstance or to plant a variety that is resistant to triazine injury such as Russet Norkotah. Symptoms are the same as those described for metribuzin (Lexone, Sencor). The most notable early symptom is veinal chlorosis.
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