﻿DKY SUBSTITUTES FOR LIQUID LIME-SULPHUE 



19 



«veii at the rate of 25 pounds to 50 gallons could not be considered 

 satisfactory. Tlie weakest spray not only failed to give a good con- 

 trol of hibernating scale, but allowed almost half as many young 

 scales to settle on the new wood as were counted on the untreated 

 trees. 



Table 15. — Results of tests with dry sodiwm-sulphur sprays against the San Jose 

 scale on peach trees at Canton, Miss., in 1922 





Quan- 

 tity in 

 50 gal- 

 lons of 

 spray 



Hibernating 

 scale 



Infestation of young scale on 80 linear inches of 

 new wood 



Material used 



First generation 



Second generation 





Dead 



Con- 

 trol 



Num- 

 ber of 



scales 



Aver- 

 age 

 per 

 inch 



Per- 

 cent- 

 age of 

 check 



Num- 

 ber of 

 scales 



Aver- 

 age 

 per 

 inch 



Per- 

 cent- 

 age of 

 check 



Sodium-sulphur No. 2 



Do 



Pounds 

 12.5 

 19 

 25 



Gals. 

 6.66 



Per cent 

 34.4 

 48.9 

 58.8 



77.6 

 20.2 



Per cent 

 17.8 

 36.0 

 48.4 



71.9 



362 



278 

 178 



37 

 1,483 



4.53 

 3.48 

 2.23 



.46 

 18.5 



24.5 

 18.7 

 12.0 



2.5 



783 

 540 

 419 



117 

 2,121 



9.79 

 6.75 

 6.24 



1.46 

 26.51 



36.9 

 25.5 



Do - 



19.8 



Liquid lime-sulphur ' 



Check 



5.5 













1 Baume 33.4°. 



In the experiments reported in Table 15 the dry sodium-sulphur 

 failed to show a control that could be considered satisfactory, even 

 when used at the rate of 25 pounds to 50 gallons of water. Although 

 the liquid hme-sulphur was not satisfactorily effective, it gave much 

 better control than did the dry substitute. 



EXPERIMENTS IN 1923 » 



The tests with dry sodium-sulphur No. 3 were made at Stuart, Va., 

 and Canton, Miss. The results of these experiments are given in 

 Tables 16 and 17. 



Table 16. — Results of tests with dry sodium-sulphur sprays against the San Jose 

 scale on apple trees at Stuart, Va., in 1923 



Material used 



Sodium-sulphur No. 3. 

 Do 



Liquid lime-sulphur ' . 

 Check 



Quantity 



in 50 

 gallons 

 of spray 



Pounds 

 12. 5 

 27 



Qallons 

 0.06 



Hibernating scale 



Dead 



Per cent 

 55.6 

 72.8 



97.0 

 22.7 



Control 



Per cent 

 42.0 

 64.8 



Infestation of young scale 

 on 80 linear inches of new 

 wood 



Number Average 

 of scales per inch 



216 

 146 



39 

 804 



2.7 

 1.81 



.49 

 10.06 



Percent- 

 age of 

 check 



26.9 

 18.0 



4.9 



I Baum6 31.8°. 



The experiments reported in Table 16 indicate the same lack of 

 control that has been noted in the earlier tests. Although the 



>* For details of these experiments see p. 1 1-12. 



