|dc.description.abstract||For successful strawberry production, weed control in the first
four to six weeks after planting is essential to avoid reductions in
vegetative growth and fruit yield from weed competition. The day-neutral
strawberry has the potential as a commercial crop, but
applied research into weed control is needed to determine tolerance
to herbicides. Field experiments were conducted in 1984 and 1985 to
evaluate the effects of herbicides (alone or in combination) on
growth and development of two strawberry types, 'Hecker' (day-neutral)
and 'Bounty' (June-bearer). All herbicide application rates
are given as kilogram active ingredient per hectare (kgÂ·ha-1).
Trifluralin (1.1, 2.2 kgÂ·ha-1); pendimethalin (1.5,3.0 kgÂ·ha-1);
napropamide (4.5 kgÂ·ha-1) were preplant incorporated (PPI).
Simazine (0.5,1.0 kgÂ·ha-1); terbacil (0.25/0.15 kgÂ·ha-1, 0.5/0.25
kgÂ·ha-1); metolachlor (1.68, 2.64 kgÂ·ha-1), sethoxydim (0.25, 0.35
kgÂ·ha-1); chloroxuron (5.6 kgÂ·ha-1) were applied four and eight
weeks after planting, respectively. Two combinations included were trifluralin (PPI)/ terbacil (POST) applied at 1.1/0.5 kgÂ·ha-1 and
napropamide (PPI)/ sethoxydim (POST) applied at 4.5/0.25 kgÂ·ha-1.
Trifluralin applied at 2.2 kgÂ·ha-1, napropamide/sethoxydim
(4.5/0.25 kgÂ·ha-1), pendimethalin applied at 3.0 kgÂ·ha-1, chloroxuron
applied at 5.6 kgÂ·ha-1; both rates of simazine, terbacil, metolachlor,
and sethoxydim in 1984 reduced 'Hecker' fruit yield. No significant
reductions in 'Hecker' fruit yield occurred in 1985 when compared to
the untreated control. Trifluralin applied at 2.2 kgÂ·ha-1 caused
reductions in Bounty fruit yield. No significant reductions in
'Hecker' runner growth occurred in 1984, however, reductions
occurred in all treated plots in 1985. Significant reductions in
'Bounty' fruit yield resulted from plots treated with trifluralin
applied at 2.2 kgÂ·ha-1. Significant reductions in 'Bounty' runner
growth occurred in all treatment plots in 1984 except
trifluralin/terbacil and terbacil (0. 25/0.15 kgÂ·ha-1) treatment plots.
In 1985, significant reductions in runner growth resulted from
napropamide (4.5 kgÂ·ha-1), napropamide/sethoxydim, and terbacil
(0.25/0.15 kgÂ·ha-1) treatments. The most effective weed control
results were obtained from napropamide and pendimethalin
treatments. All treatments were safe on Bounty, however Hecker
had a lower level of tolerance to all herbicide treatments.
Unacceptable levels of terbacil residue were detected in 'Hecker'
Note:Page vi is missing in the original thesis.||en_US