Vol. 16—1962 - NorthEastern Weed Science Society

WEEDCONTROLIN TRANSPLANT TOMATOES
(A PROGRESSREPORT)
277
W. V. Welker. Jr. and T. J. Monaco l
Two e.Jtperiments were conducted on transplanted tomatoes duping
the 1961 season as a continuation of a project initiated in 1957.
The objective of these experiments was to eval~te herbicides tor
the control of weeds from the last cultivation through the harvest
season.
The variety Rutgers was used in an eJCPeriment at New Brunswick
on a Sassafras sandy loam soil. The plants were set May 31 and
the herbicideswere applied July 18 as granular formulations. The
plots were maintained weed-free by cultivation up to the time of
treatment. Half of each plot was cultivated immediately before
application of the herbicides. None of the herbicides were
worked into the soil. The major weed Rpecie~ that developed af.ter
application of the herbicides were CrabgraSS~1fitaria sangu1na11s
(L.) Scap.) and fall panicum Panicum dichtt f OrUD! MicbX.).· The
minor weed species were pigwee ranthus retroflexus L.) and
lambsquarters (Chenopodium a1bum
A randomized complete block design with three replications
was used~Each p~ot consisted of two rows 3~teet long with 7
feet between plots. Three pickings were made during the season.
Weeds were counted to determine the degree of weed control.
The herbicides used may be placed in three categories as
follows:
Excellent Weed Control
amiben
3 -amino -2 . 5 - d i c hl o rob e nz o i c acid)
tillam
Propyl ethyl-N-butylthiocarbamate)
diphenamid ~ N.N-dimethyl-c-'-diphenylacetamide)
4 & 8 lb/A
4 & 8 Ib/A
3 & 6 lb/A
Intermediate
dacthal
CIPC
CDEC
Weed.Control
(dimet~l 2•.3.5 J 6 tetrachloroterephalate)
(isopropyl N-(3-chlorophenyl)carbamate
(2-chloroallyl diethyldithiocarbamate)
12 lb/A
6lb/A
81b/A