LIME-SULPHUR PEiEPARATTONS FOR APPLE DISEASES. 15 



On varieties subject to attacks of apple scab, especially in districts 

 where this disease prevails, use a reliable commercial lime-sulpliur 

 solution (re«^isterin»]j about 32 dej^rees on the Baume scale) at the 

 stren<:;th of 1^- gallons to 50 (gallons of water or an equivalent strength 

 of the home-boiled solution," with 2 pounds of arsenate of lead. Spray 

 the trees (1) just before they bloom (after the cluster buds open); (2) 

 as soon as the petals fall; (3) three to four weeks after the petals 

 fall, and (4) nine to ten weeks after the petals fall. This course of 

 treatment is intended for (he control of apple scab, codling moth, 

 leaf-spot, and other minor troubles. 



In the treatment of varieties not seriously subject to scab, or in 

 districts where this disease is not prevalent, tlu> application before the 

 trees bloom may be omitted, making only three applications in all. 



On varieties requiring treatment for bitter-rot, the lime-sulphur 

 solution and arsenate of lead may be used in the two or three early 

 sprayings, and Bordeaux mixture (3-4-50) and arsenate of lead in 

 the applications required for bitter-rot, as follows: About nine weeks 

 after the petals fall and at intervals of two or three weeks until three 

 applications shall have been made. 



On such varieties as the York Imperial, Grimes, Ben Davis, Gano, 

 and Wealthy, located in Virginia, West Virginia, jMaryland, and other 

 similar sections where these varieties suffer veiy little, or not at all, 

 from attacks of scab, the self-boiled lime-sulphur mixture (8-8-50), 

 with arsenate of lead, may be used with complete success. Spray 

 the trees (1) as soon as the petals fall; (2) three to four weeks after 

 the petals fall, and (3) nine to ten weeks after the petals fall. Tliis 

 course of treatment wall control the apple leaf-spot, mild cases of 

 scab, and other minor troubles, as well as the codling moth. The 

 advantage of this mixture over the boiled solution is that it is abso- 

 lutely harmless to fruit and foliage, while the use of the latter is 

 attended with some danger of foliage injury. 



After another year's experiments the courses of treatment here 

 specified will doubtless have to be revised. They are suggested as a 

 guide in spraying apple orchards until further information on the 

 comparative value of various sulphur sprays can be obtained. 



Approved : 



James Wilson, 



Secretary of Agriculture. 



Washington, D. C, Fehruary 7, 1910. 



"This solution may be prepared by boiling 16 pounds of sulphur and 8 pounds of 

 lime with a small quantity of water for about one hour; then strain and add water to 

 make 200 gallons of spray; or stock solutions may be prepared according to Stewart's 

 method, as described in Bulletin 92 of the Pennsylvania Agricultural Experiment 

 Station. 



[Cir. 54] 



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