Vol. 15—1961 - NorthEastern Weed Science Society

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PRE-ENERGENCE CRABGRASS CONTROL TRIALS­
1960
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J. E. Gallagher and R. J. Otten
303.
Objectives
Tests in the Amchemgreenhouses during the winter of 1959-1960
indicated that several new organic arsenical materials had the properties of
selective pre-emergence crabgrass control •••• that is, preventing crabgrass
seeds from growing past the seedling stage while allowing turfgrass seeds to
sprout and grow normally.
OUtdoor tests performed during the spring and summerof 1960 were
designed to test these and other chemicals under field conditions for the
following properties:
a) effective pre-emergence crabgrass control for an entire season
with one spring application of the chemical.
b) tolerance of turfgrass seeds planted immediately or at
intervals after application of the chemical.
- Location
c) tolerance of turfgrass seedlings to applications of the
chemical at different stages of growth.
The pre-emergence crabgrass test was performed in the praotice fairway
of Oak Terrace Country Club, Ambler, Pa, The natural turf present is a
mixture of primarily bluegrass and fescue with some native bent. The area is
on a loW'maintenance program and develons a severe crabgrass infestation every
year.
The seeding trials were performed on the AmohemResearch Far.m, Ambler,
Pa. in areas prepared especially for these tests.
l-1ethod
a) Pre-emergence orabgrass trials
Plts 6' x 10' (60 sq. ft.) were laid out in a tandom design.
Each treatment was replicated. three times. Dry materials were
weighed out in advance and spread by hand. Liquid materials or
vlettable powders were measured out, mixed with water (equivalent
to 180 gpa) and applied with a small-plot sprayer.. Natural
rainf~ was the onJ..¥source of water in this area.
1 Agricultural Research Department, AmchemProducts, :rnc., Ambler, Pennsylvani.a