10 
HARllISOXS’ NURSERIES. BERLIN, MD., U. S.A. 
Spraying 6-Year-Old Peach Orchard. 
Commercial.— Lime-'ulfur solution may he purchased from various 
firms. It should be diluted as above. Soluble oils may be substituted 
1 to IS for dormant spray. Dry sulfur compounds, manufactured by 
various firms, may be used in place of the liquid lime-sulfur if applied 
at the maximum amount recommended by the manufacturers. 
2. SELF-BOILED LIME-SULFUR: 
Flowers of sulfur. S lbs. 
Stone lime of good quality . 8 lbs. 
Water .. 50 gals. 
Start the lime to slaking with a little water. (I'sc hot water if lime 
is slow-actinp.) As soon as the lime begins to slake rapidly, add the 
sulfur and stir continuously, adding just enough water from time to time 
to form a thin paste and to allow the mi.xture to boil violently for from 
three to five minutes. Add cold water to prevent any further action of 
the lime. Strain .at once into spray tank. Add water to make .50 gals. 
Larger quantities in the same proportion may be made, but greater care 
will be required to prevent the mixture from becoming too hot. in which 
case the sulfur will he dissolved and there will be red scum formed on 
the surface. This red material will injure the foliage and fruits. When 
applying this spray, a good agitator is essential. Atomic sulfur, a 
commercial product, used at the rate of 5 lbs. to 50 gals., may be 
substituted. 
8. BORDEAUX MIXTURE: 
Copper sulfate (Blue-stouc). 4 lbs. 
Stone lime of good quality . 5 lbs. 
Water . 50 gals. 
Dissolve the blue-stone by suspending it in a bag ne.ar the surface of 
a few gallons of water contained in a wooden or earthen vessel. Slake 
the lime and add several gallons of water so as to make milk of lime. 
Pour the blue-stone into the spray tank and add enough water to make 
20 to 30 gals.: llien strain the milk of lime into the bar'd, agitating the 
mixture vigorously. Add water to make 50 gals. Use immediately. 
STOCK SOLUTIONS: 
Dissolve blue-stone at rate of 1 lb. to 1 gal. water. Slake lime and 
dilute at rate of 1 lb. to 1 gal. Keep in separate covered containers 
until ready to make bordeaux according to above formula. Prepared 
bordeaux, cither dry or in paste, or Pyrox may be .sub.stituted. 
I. ARSENICALS: 
Arsenate of lead is tlie standard stom.ach poison. It is furnished in 
both the powder and paste form. The powder is much the ea.sier to use 
.as It can be used dry, as a dust, or combined with liquids. The paste 
IS not easily kept for any Icngtli of time because of evaporation, and 
hence cannot be held over from one season to another as easily as the 
powder. 
Arsenate of lime is cflective for truck crops and apples and is cheaper. 
Arsenite of zinc is a quick-acting poison, valuable for truck-crop work. 
5. CORROSIVE SUBLIMATE OR BICHLORIDE OF MERCURY: 
Seed Potato Treatment. 
Dissolve 4 oz. In a little warm water in a wooden or earthen vessel 
and dilute to 30 gal. Immerse whole potatoes in the solution for I'A 
P^ISONOUS^”^ tirnes. DEADLY 
FORMALIN: Use one pint to 30 gal. of water. Immerse whole 
potatoes for two hours : dry and cut. 
6. NICOTINE SPRAYS: 
Nicotine in various forms and under such trade names as Black Leaf 
40, may be purchased from insecticide dealers, and should be used as 
directed in the schedule for aphids. 
