Four sweetpotato [Ipomoea batatas (L.) Lam.] clones were evaluated for
metribuzin tolerance in greenhouse and field experiments. W-262 exhib
ited metribuzin response similar to the highly tolerant clone Tinian (
U.S.P.I. 153655), SC 1149-19 was highly sensitive to metribuzin, and t
he commercial cultivar Jewel was intermediate in tolerance. Due to its
more desirable horticultural characteristics and higher yields, W-262
is superior to Tinian as a source of metribuzin tolerance in sweetpot
ato breeding. Chemical name used: ethylethyl)-3-(methylthio)-1,2,4-tri
azin-5(4H)-one (metribuzin).