10 



HARRISONS' NURSERIES, BERLIN, MD., U. S. A. 



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spraying 6- Year-Old Peach Orchard. 



Commercial. — Lime-sulfur solution may be purchased from various 

 firms. It should be diluted as above. Soluble oils may be substituted 

 1 to 15 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 8 lbs. 



Stone lime of good quality 8 lbs. 



Water 50 gals. 



Start the lime to slaking with a little water. (Use hot water if lime 

 is slow-acting.) 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 mixture 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 be 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. 



3. BORDEAUX MIXTURE: 



Copper sulfate (Blue-stone) 4 lbs. 



Stone lime of good quality 5 lbs. 



Water 50 gals. 



Dissolve the blue-stone by suspending it in a bag near 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. ; then strain the milk of lime into the barrel, agitating the 

 mixture vigorously. Add water to make 50 gals. L^se 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, either dry or in paste, or Pyrox may be substituted. 



4. ARSENICALS: 



Arsenate of lead is the standard stomach poison. It is furnished in 

 both the powder and paste form. The powder is much the easier to use 

 as it can be used dry, as a dust, or combined with liquids. The paste 

 is not easily kept for any length 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 effective 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 1^ 

 hours. Dry and cut. L''se only four or five times. DEADLY 

 POISONOUS. 



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. 



