Vol. 15—1961 - NorthEastern Weed Science Society

148.
WEEDCONrROLEXPERIMENl'S WITHNURSERYPLAlf.rS
Arthur
Bing*
This report is on a continuation ot the wee,d control experiments being
carried out at the Cornell Ornamentals Research Laboratory on Long Island and
in commercial nurseries in the Nell'York metropoli tanar.ea. This work is being
carried out' in collaboration with Dr • Pridham at Ithaca. There are several
separate experiments being carried on and each will be discussed seParately.
Tolerance of Nursery stock to Herbicic.les
There is much interest in which herbicides at what strength. can be used
on woody ornamentals grOWing in the nursery row or in a ~andscape planting.
This experiment is concerned with the planting ot a variety of yoUDgwoody
plants and treating them with various rates of herbicides. One set of
Atrazine plots was raked in after treatment to see if it 'j" > improved or lowered
the usefulness of the material. A similar trial was carried out with EPI'C.
Four hundred foot roys containing 200 ~iners 2 feet apart were planted
with 3 feet between rows. There were t-.o rows of Taxus cus:p1data Hicks1i (Hicks
yew), and one each of Uex crenata convexa (Boxleafed Holly) , Juniperus hetzii
(Hetz juniper), Ligustrum ovalitol1um (California privet), Rhododendron obtussum
var. Hinocrimson (Hinocrimson azaJ.ea), and B;ydrangea macrophy'lla var. Stratford
(Stratford hydrangea). PJ.antings were made on ~ 3 to ll, all rows were
tractor cultivated on Mq 12, and herbicidal treatments made on Mq 13 and 17.
Each treatment consisted of 1 concentration of: a"material across the rows to
include 2 plants in each row.
The granular treatments were appl.ied with a calibrated lawn spreader
mounted on large wooden wheels. The liquids were applied with a 1 172 gallon
hand sprqer equipped with a flat spr. nozzle. Liquid was applied at 1
quart per 100 square feet which is equivalent to ~OO gallons per acre.
The treatments and rates used are shown in Table ~. One set ot Atrazine
treatments was raked in (cult) the other was lett undisturbed. EPTCtreatments
were also applied in duplicate and one set of treatments raked into the
soil. Atrazine plus Zytron and Atrazine plus Dacthal were used to try to
control crabgra.ss which usually comes up strong in otherwise clean Atrazine plots.
The Dacthal, Zytron, CDEC,Amiben, and CIPC plots became weedy fa.irly
early and were hand weeded. Weed ratings were made June 18 before the
hand weeding and on August ~7-24 when all plots were cultivated and hand
noed. Cultivation was continued weekly until fall treatments were made in ~"
early November 1$)60. PJ.ant tolerance data were taken September 16. Table
2 shows the minimum rate ot &ny' herbicide used in the experiment that caused
marked injury during the four month growing period. Atrazine did not serioualy
affect Uex at erry of the rates used (see Table 1 for rates used) but at 8
pounds per acre was harmful to pr1 vet. Simazine and Atrazine were quite
* Cornell OrnamentaJ.s Research Laboratory, Farmingdale, Long Island, NewYork.