Vol. 15—1961 - NorthEastern Weed Science Society

44.
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with the time of last cultivation and therefora it is more important
that applications of Vegadex be timed with weed development
so long as the application does not contribute to residue
problems.
Post emergence treatment with granular formulations will require
some modification of applicating eqUipment to sutt the particular
situation. For a post transplant treatment on tomatoes a 12 to
11
14 . band is adequate but for lay-by applications an 18 to 24 11 band
is more desirable. This would reqUire additional row banding equipment
or the use of broadcast equipment modified to deliver the
wider band. In some areas, where eoonomics permit, aerial applications
can be used.
Application of Vegadex through sprinkler irrigation water presents
still another method of application which has been used successfUlly
by several growers where broadcast application is desired.
It is usually the practice to apply 1/4" of water followed by the
introduction of Vegadex in the next 1/4" of water and flushing
the line for 5 to 10 minutes. Preliminary work in New York, Tennessee
and California on leaf crops and celery has shown that this
method may be applicable for pre-emergence use as well as on established
crops where sprinkler irrigation is used. It is however
essential that the sprinkler pattern be uniform since over-.
lapping patterns could cause injury. Likewise, IIunder irrigated"
areas would not receive sufficient Vegadex for effective weed control.
Since so many crops and cultural practices are tnvo lved , occasionally
reports are received where Vegadex causes excessive stand reductions
on crops normally believed tolerant. One s~ch instance is turnip
greens. Upon investigation by Dr. Campbell of the Development
Department, he found that the tolerance was very closely related
to depth of seeding. The follOWing table il'lustrates this:
Rate of Vegadex
Yield of Turnip Greens
Tons per acre
Depth of Seeding
pounds per a ere Shallow. Deep**
4 2.0
I
7.0
* broadcast With Brillion seeder
** same type of seeding followed by h$rrowing and cult i­
packing
lMonsanto Chemical Company, St. LOUiS, Missouri