﻿DKY SUBSTITUTES FOR LIQUID LIME-SULPHUR 



spray were used per tree. The composition and dilution of the 

 essential materials in the sprays are shown in Table 4. 



Table 4. 



-Composition of the dry calcium-sulphurs tested in experiments against' 

 the San Jose scale in 1922 



Material used 



Percentage of— 



Quantity 









used 

 in 50 









Calcium 



Calcium 





gallons 



poly- 



thio- 



Sulphur 



of 



sulphides 



sulphate 





spray 









Pounds 



70.72 



8.76 



3.35 



13.5 



70.72 



8.76 



3.35 



20 



70.72 



8.76 



3.35 



27 



72.43 



9.33 



6.50 



12.5 



72.43 



9.33 



6.50 



19.8 



72.43 



9.33 



6.50 



25 



69.16 



12.53 



6.03 



13.5 



69.16 



12.53 



6.03 



20 



69.16 



12.53 



6.03 



27 

 Gallons 



31.71 

 31.71 

 30.59 



1.80 

 1.80 

 1.88 





6.66 

 3.25 

 6.66 







30.59 



1.88 





3.25 





Quant- ty 

 of poly- 

 sulphides 

 in 50 

 gallons 



Dry lime-sulphur A. . 



Do 



Do 



Dry lime-sulphur B.- 



Do 



Do 



Dry lime-sulphur C. 



Do 



Do 



Liquid lime-sulphur i 

 Do.i 



Liquid lime-sulphur 2 

 D0.2 



Pounds' 

 9.54 

 14. 14 

 19.09 

 9.05 

 14.34 

 18.10 

 9.33 

 13.83 

 18.67 



22.87 

 11.16 

 21.88 

 10.68 



1 Used in Mississippi; sp. gr. 1.30, Baumfi 33.4°. 



2 LTsed in Indiana; sp. gr. 1.29, Baume 32.6°. 



On April 26 a careful count was made of 2,000 scales on twigs 

 taken from all parts of the trees in each plat. On June 29, 80 linear 

 inches of new wood from each plat were examined and the number 

 of young scales of the first generation recorded. The results of these 

 counts are given in Table 5. 



Table 5. 



-Results of tests against the San Jose scale made on apple trees at 

 Bicknell, Ind., in 1922 



Material used 



Dry lime-sulphur A. 

 Dry lime-sulphur B. 

 Dry lime-sulphur C. 



Liquid lime-sulphur 

 Check 



Quantity 



in 50 



gallons 



of spray 



Pounds 

 13.5 

 20 

 27 

 12.5 

 19.8 

 25 

 13.5 

 20 

 27 



Gallons 

 6.06 

 3. 25 



Untreat- 

 ed. 



Hibernating scales 



Dead 



Per cent 

 65.5 

 80.5 

 84.6 

 69.8 

 75.1 

 79.8 

 60.7 

 78.5 

 81.3 



97.0 

 70.8 

 55.0 



Control 



Per cent 

 23.3 

 66.6 

 65.7 

 32.8 

 44.6 

 55.1 

 12.6 

 52.2 

 58.4 



94.6 

 35.1 



Infestation of young scales on 

 80 linear inches new wood 



Total 

 scale 



3,801 



2,882 

 2,459 

 5,008 

 3,684 

 2,471 

 4,806 

 3,111 

 2,279 



175 

 3,547 

 8,873 



Average 

 per 

 inch 



47.51 

 36.02 

 30.73 

 62.60 

 46.05 

 30.88 

 60.07 

 38.88 

 28.49 



2. 19 

 44.34 

 110.91 



Percent- 

 age of 

 check: 



42.8 

 32.5 

 27.7 

 56.4 

 41.5 

 27.8 

 54.2 

 35.1 

 25.7 



2.0- 

 40.0 



APPLE TREES, 1922 



In the 1922 experiments, as in those of 1921, the weaker solution 

 failed to give any practical control of scale, Altliough a much 

 higher percentage of control was obtained witli tlie greater strengths, 

 it was still much lower than that secured witli li(j[uid lime-sulphur and 



58254— 26t 2 



