Vol. 15—1961 - NorthEastern Weed Science Society

41.
RECENTDEVELOPMENTS IN THEUSE OF VEGADEX I
R. E. Althaus 2 and L. S. Glcason 2
Since the introduction of Vegadex (2-chloroallyl dlethyldithiocarbamate)
(CDEC), its use as a herbicide for vegetables has been on a
constant increase. Grower acceptance has been due chiefly to its
versatility on a wide range of vegetable crops both from the standpoint
of weed control and crop tolerance.
Its initial use was intended primarily for pre-emergence weed control
applied as sprays. With the advent of granular formUlations,
additional usage has. been directed toward transplant and other
stages of crop post-emergence applications.
My purpose today is to discuss recent developments with respect to
new uses and the expanded use for multiple applications.
To date 33 crops are approved for use, and several more will be
submitted for label registration. All the uses now listed on the
label are approved for both emulsifiable and granular formUlations.
The emulsifiable formulation of CDECis supplied as a 4 pound per
gallon concentrate, and the granulef?contaln 20% CDEC. Granular
formulations have proven to be equally effective as sprays, however,
uniform distribution is essential (1).
It has been recognized from the early developmental staRe~ that the
performance of vegadexis enhanced under moist soil conditions.
Since many· vegetable growers irrigate and also because many of the
vegetable production centers are 1n aI?eas of adequate rainfall,
this has not been a serious deterrent to its use but has .contributed
to occasional failures. The moisture reqUirement for granUles and
for sprays is equally important.
In areas where furrowlrrigation is practiced, weed control has
been erratic. The movement of Vegadex through the soil is now
being explored intensively.
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lRegistered trademark of the Monsanto Chemical Company
2Monsanto Chemical Company, st. Louis, Missouri