Control and Sunflower Tolerance of DPX-R6447 and Sulfentrazone
study was conducted on a Heimdal silt loam soil with a 6.7 pH and 2.9% organic
(SF290 NL) was seeded on May 26th, into 30 inch rows at 24,500
incorporated (PPI) and preemergence (PRE) treatments were applied to 10-by 25-ft
plots with a hand-boom plot sprayer calibrated to deliver 20 gpa at 20 psi
through XR8003 flat fan nozzles (Table 1).
The POST treatments were applied with XR8002 flat fan nozzles calibrated
to deliver 20 gpa at 35 psi.
The PPI treatments were incorporated twice with a cultiharrow.
The experimental design was a randomized complete block with three
evaluated were yellow foxtail, common lambsquarters and redroot pigweed.
The trial area was heavily infested with yellow foxtail early in the
June 20, both DPX-R6447 and sulfentrazone applied PPI and PRE provided >75%
control of yellow foxtail (Table 2).
By July 20, DPX-R6447 applied PRE at 0.125 lb ai/A was the only treatment
with > 75% yellow foxtail control.
Both treatments that included quizalofop-P-ethyl provided 99% control of
the yellow foxtail.
The addition of pendimethalin to DPX-R6447 and sulfentrazone did not
improve yellow foxtail control.
Both DPX-R6447 and sulfentrazone applied PPI and PRE provided excellent
control of common lambsquarters and redroot pigweed.
differences in sunflower injury were detected (data not shown).
Due to the heavy yellow foxtail infestation, yields tended to increase as
the yellow foxtail control increased (Table 2).