Vol. 15—1961 - NorthEastern Weed Science Society

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Progress Report on Weed Control in Beets,
Carrots,
Snap Beans and Sweet Corn
W. J. Saidak l
Chemical weed control trials in certain vegetable crops \Jere conducted at
Ottclwa in 1959 and 1960. These trials were designed to compare promising new
materials with the herbicides currently recommended by the Eastern Section of the
Canadian National ~eed Committee. Particular attention was paid to the effect of
treatments on yield, the duration of the weed control period and the reliability
from year to year.
The experimental design used for each trial was a randomized complete
block with 4 replications. Minimumplot size for beets, carrots and snap beans was
3 rows each 25 ft long, while minimumplot size for sweet corn was 2 rows each 25
ft long. All crops were planted in rows 3 ft apart. Cultivation during the growing
season was limited to the center 2 ft between rows. The sandy loam soil used was
dragged and rolled before planting.
All liquid chemicals were applied using a C02 powered plot sprayer at a
pressure of 25 psi and in a water volume of 48 gpa. Granular herbicides were
diluted with white silica sand and distributed by hand.
The predominant weeds in the area used for the trials were: commonlambsquarters
(Chenopodium aJ.,bum..L.)
I redroot pigweed (AmarSlontbut.;1 retroflexYfl L.) I barnyard
grass (Echinochloa crYSfalli (L.) Beauv.), commonpurslane (portulaca olerac§§
L.), Pennsylvania smartweed ~n£m ~ensYlvanicum L.), witchgrass (Panicum
capillar~ L.), field bindweed (~nYolvulY§ arven~ L.) and shepherdspurse (Qapsella
bursa-pa~toris (L.) Medic.)
Beets Detroit Dark Red beets were planted on May 16, 1960. Treatments which
were incorporated pre-planting were applied immediately prior to seeding; the
pre-emergence treatments were applied immediately after seeding. The predominant
weeds in the control plots were commonlambsquarters and redroot pigweed as well as
some barnyard grass, commonpurslane and Pennsylvania smartweed. The marketable
yield of beets and fresh weight of weeds obtained from the denter 20 ft of the
middle row in each plot are presented in Table 1. These data were recorded on July
19 and 20.
IPlant Research Institute,
Ottawa.
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