Mw. Farnham et Hf. Harrison, RESPONSE OF BROCCOLI (BRASSICA-OLERACEA) CULTIVARS TO POSTTRANSPLANT OXYFLUORFEN, Weed technology, 9(2), 1995, pp. 385-391
Broccoli cultivars were evaluated for differential response to oxyfluo
rfen applied postemergence (0.1 to 1.6 kg ai/ha) in the greenhouse and
post-transplant (0.125 to 1.0 kg/ha) in a spring and a fall field stu
dy. One cultivar, 'Green Goliath,' was injured more by oxyfluorfen tha
n other cultivars in all environments. 'Pinnacle,' was consistently le
ss injured than others. 'Early Dawn' and 'Emerald City' were intermedi
ate in response to oxyfluorfen. At application rates of 0.25 kg/ha or
less, all cultivars recovered sufficiently from injury to produce broc
coli heads of equal weight and quality as controls. Cultivars differed
in their tolerance of oxyfluorfen at rates above 0.25 kg/ha. Late-mat
uring cultivars (i.e., Pinnacle) usually recovered from injury to yiel
d similarly to hand-weeded plots while early-maturing cultivars were m
ore likely to show yield losses. Broccoli cultivars possess sufficient
tolerance to oxyfluorfen applied post-transplant for weed control. Ap
propriate choice of cultivar will enhance its utility.