Vol. 15—1961 - NorthEastern Weed Science Society

457.
1:1ETHODSOF APPLYINGMALEICHYDRAZIDE
David G. Grinnn 1
In the fall of 1959, the first test plots. using
maleic hydrazide to inhibit the growth of grass wer'e.begun in
the northern sections of the New Jersey Turnpike. : The purpose
of these trials was to familiarize ourselves with the problems
that might confront us if a large. scale operation.were to be
initiated. The results of these initial tests will. be discussed
in detail by Mr. Paul Bohne, Naugatuck Chemical Division, U.S.
Rubber Company.
However, in the late fall before dormancy, in the
area around Hightstown, we treated approximate~y five acres.
Because of this particular test and inconsistent results
observed the following spring of 1960, we realized we had to
search for a more practical method of applying maleic hydrazide.
It would be to our advantage to discuss the Hightstown
experiments. A 200 gallon spray tank, trailer mounted,
ri[ged with a Hudson all-purpose spray boom, was used. The·
boom had 13 nOZZles, and was set at 17 inches above grade.
The amounts of material used are relatively unimportant at this
time. This entire unit was conveyed by a jeep. At no time
during the application did the operator change the height of
the boom or regulate the controls. The entire bowl area was
treated with no regard for overlapping. The results showed
evidence that maleic hydrazide definitely inhibited the growth
of grasses 8 The degree of inhibition varied with the rates
of maleic hydraZide applied. The limiting factor in this test
was the method of application. Severe browning out occurred
on all turns. It was obvious that three or four turns were
made at the same location. As the unit moved along the terrain,
the height of the boom varied tremendously. At times the boom
wa~ within six inches of the grade, accounting formany skips
in the spray pattern. Every dip, every roll in the grade added
to the irregularities of the spray apttern. It was necessary
to mow this lawn area in order to maintain the turf at an even
height. A general observation that may be of interest was the
reduction of broadleaf weeds. The fall application prevented
1. Horticulturist, New Jersey Turnpike Authority,
New Brunswick, New Jersey