Hf. Harrison et Mw. Farnham, DIFFERENTIAL TOLERANCE OF BROCCOLI (BRASSICA-OLERACEA) CULTIVARS TO PREEMERGENCE APPLICATION OF OXYFLUORFEN, Weed technology, 12(1), 1998, pp. 14-18
The tolerance of 10 broccoli cultivars to preemergence (PRE) applicati
ons of oxyfluorfen was evaluated in greenhouse and field experiments.
Differences in tolerance among cultivars were expressed as differences
in seedling injury ratings and growth and stand reduction. The cultiv
ars 'Pinnacle' and 'Mercedes' were most tolerant, 'Embassy' and 'Early
Dawn' were least tolerant, and other cultivars were intermediate in t
olerance. Broccoli seedling weights and stand counts averaged across 1
0 cultivars and oxyfluorfen application rates of 0.125, 0.25, and 0.5
kg/ha were 70 and 81% of control, respectively. for the two fall-plant
ed experiments and 39 and 50% of control, respectively, for the spring
-planted experiment. Differences in tolerance among cultivars were les
s distinct in the cooler spring than in the warmer fall season. Oxyflu
orfen application that caused stand and early growth reduction did not
always affect broccoli head weight or quality or delay harvest.