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Rahmlow, H. J. (ed.) / Wisconsin horticulture
Vol. XXX (September 1939/July-August 1940)

Wisconsin horticulture, vol. 30, no. 11: July-August, 1940,   pp. [305]-328

Page 309

Coloring Apples After Picking 
                             Lawrence Southwick, N. Y. 
D ETACHED pieces of live 
    green apple skin will develop 
red color under proper conditions 
of exposure and moisture. But 
following periods of storage, the 
skin cells usually die and such 
fruits will never take on color, 
even under conditions fostering 
such development. 
    Coloring After Picking 
  From what has been said, it is 
at once evident that apples need not 
le attached to the tree to develop 
color. Mlany fruit growers know 
that "drops" will color if allowed to 
remain under the tree for several 
days. In many cases it has seemed 
that color development actually has 
been speeded up following either 
natural abscission or artificial re- 
noval from the tree. Usually, how- 
ever, under ordinary commercial 
handling conditions, apples are re- 
moved from direct light exposure 
shortly after picking so that most 
of the crop is never given a chance 
to increase the amount or the qual- 
ity of the red blush. 
  In recent years some experimen- 
tal coloring of fruits before, dur- 
ing and after harvest has been done 
by Experiment Stations and also by 
a few individual growers. In the 
Last, McIntosh and Northern Spy 
have been used to a large extent 
because of the tendency for these 
important commercial varieties to 
color poorly uinder conditions fav- 
oring high production, especially in 
some years. Hofftifai's results at 
Ithaca indicated that picked ap)ples 
will develop "very satisfactory col- 
or with a rather low total light in- 
tensity provided a relatively large 
plroortion of the light is made up 
of the showt wave leinths contain- 
ing the ultra-violet.'" This finding 
illustrates the fallacy i'n Old0 meth- 
ods of exposing detached fruits to 
the direct rays of the sun without 
shading. SCe'ere scald(ig was oftcn, 
     New Coloring Method 
  Hoffman   devised  a  coloring 
method which any fruit grower can 
use effectively under the right con- 
ditions. On a shaded site a frame 
consisting of a roll of ordinary 
poultry wire four feet wide and 100 
feet long is stretched across 18- 
inch supports. If the frame is in 
the open, a shade consisting of at 
least three layers of cheesecloth or 
its equivalent it stretched over the 
tI)) about 18 inches above the fruit. 
.Such a frame will accommodate 50 
hushels of app1)les. Mclntosh, green 
at harvest time, will develop) fancy 
color after a few  day s on1 this 
   Coloring Lower Side With 
         White Oilcloth 
  The exact length of time will de- 
piid largely oni weatlier conditions. 
\Vith white oilcloth stretched on 
Ibie grouinl under the frame, even 
      (Continued on Page 317) 
            AMERICAN A P-L-PAKS 
Fruit containers that have proven themselves 6y actual tests 
            APPLE BASKETS 
       Bushels--Half Bushels-Pecks 
       Constructed of the best wood. 
 Write for prices on carloads and less than carloads 
              Cyanamid-21 % Nitrogen 
  Sulphate of Ammonia-Kiln Dried, 21% Nitro, 
                PRICES ON REQUEST 
  Southeastern Wisconsin Fruit Growers Co- 
             LESTER F. TANS, Sec'y-Treas. 
WAUKESHA, WIS.                     TeL Big Bend 
     Apple Graaders-Sizers-Cleaners 
Packing Forms: Bushel and Half Bushel Size 
July-A ugust, 1940 

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