Vol. 15—1961 - NorthEastern Weed Science Society

INCORPORATED ANDUNINCORPORATED·LIQ,UID ANDGRANULAR CARRIERS
OF EPTC ANDSEVERALANALOGSONWEEDCONTROLANDCORNINJURY
Richard n.Ilnicki l and Richard W. Chase 2
ABSTRACT
237.
Two techniques hav~ been introduced which substantially
advanced the field of chemical weed control. They are the use
of the granular carrier and the feature or incorporating herbicides
into the upper soil surface betore or immediately after
planting. The technique of incorporation became established with
the advent ot ethyl N,N-dl-n-propy1thiolcarbamate (EPTC), a very
effective but highly volatile herbicide.
Since the release of EPTC several related analogs have become
available to research workers tor evaluation. The objectives
of this study were as follows: (1) to evaluate these new analogs
along with EPTC as herbicides; !2) to determine the effects of
the carrier on their activity; 3) to measure the effects of incorporation
on activity; and (4 to determine the effects of
carrier and incorporation on activity.
EPTC, n-propy1 di-n-propylthio1carbamate (R-1607), ethyl
ethyl-n-butylthiolcarbamate (R-2060), and propyl ethyl-n-butyl­
,-. thiolcarbamate (R-206l) were applied aa the liquid (emulsifiable
concentrate) and as a granular (5~ onatta clay), two days after
corn planting, at rates of 4 and 6 pounds per acre of the active
ingredient. Weed control and corn injury were used as criteria
of activity.
The follOWing observations were made: (1) granular preparations
effected greater weed control and corn injury than the
liquid preparations; (2) no liquid preparation injured corn to
any degree when not incorporated; (3) When liqUid preparations
were incorporated the degree of weed control approached that of
the unincorporated granularpreparatlons; (4) incorporating the
granu.1.ars only slightly im~roved the weed control over the unincorporated
granulars; (SJ there was slight injury to corn from
unincorporate