Vol. 15—1961 - NorthEastern Weed Science Society

5450
Progress Report on the Effect of Kuron Applications
after one and Two years at Long Pond, Dutchess County,
New York.
Madelene E. Pierce, Vassar College, Poughkeepsie, New York.,
The purpose of this paper 1s to make brief oomments upon
the condition, in 1960, of experimental plots treated with
Kuron in 1957 and 1958 *(Pieroe, 1958, 1959, 1960). A· two
acre plot, treated in 1958 with a conoentration of 2 ppm, was
sucoessfully cleared of Nymphaea, Nuphar and Pontedaria and
remained clear for the entire season. In June 1939, the surfaoe
was still praotioally clear of these weeds exoept for a few
scattered plants of Nymphaea and Nuphar. The area was again
treated with a conoentration of 1.2 ppm. The soattered plants
suooumbed quiokly and the surface remained olear of them for the
entire season. During the summer of 1960 no further treatment
was given to these two acres. However, the surfaoe of the area
remained clear and not a pond lily pad was present throughout
the season.
The effect of the applioations in 1958 and 1959 upon the,
submerged weeds was not so successful. By the summer of 1960,
Utrioularia was still definitely reduoed, especially in shallow
areas, but not eradioated. Potamogeton amplifolius and P.
natans were flourishing in the deeper areas.
In June of 1957 (Pierce,1958) two small plots were twice
treated with Kuron. The first application was on June 8 at
a concentration of 0.8 ppm, and the second on June 29 at 1.3
ppm. As a result the Nymphaea was eradioated and remained so
for that season. In the spring of 1958, these plots were not
seleoted for experimental work, but as a favor to the landowners,
were given ,a heavy (not measured) spraying. As a result,
the Nymphaea was eradicated for the entire season, and
the Utricularla was ohecked in growth. By June 1959, this
portion of the shore-line was vastly improved. The surface was
olear 'of pads for the season and the submerged,Utricularia was
reduoed. No further applioation was made in 1959. During the
summer of 1960 this area remained olear of NymPhaea, and
Utricularia also remained reduced if not oomp1etely eradicated.
No further treatment was given in 1960.
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* Pierce, 1958 12th Ann. Meet. of the Northeast Weed Control
338-343
Pierce, 1959 13th Ann. Meet. of the Northeast Weed Control
310-314
Pierce, 1960 14th Ann. Meet. of the Northeast Weed Oontrol
472-475
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