Vol. 15—1961 - NorthEastern Weed Science Society
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Vol. 15—1961 - NorthEastern Weed Science Society

Vol. 15—1961 - NorthEastern Weed Science Society Vol. 15—1961 - NorthEastern Weed Science Society

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08.06.2015 Views

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.

- Table 1. Herbicides and Rates Used on Nursery Stock Applied 5/13-5/17/60 Material Formulation Rates Used Pounds Actual Per Acre

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Table 1. Herbicides and Rates Used on Nursery Stock<br />

Applied 5/13-5/17/60<br />

Material Formulation Rates Used Pounds Actual Per Acre

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