MISCELLANEOUS INSECTICIDE INVESTIGATIONS. 



37 



Table XIX. — San Jose scale insecticide investigations, Benton Harbor, Mich., 1914 — 



Continued. 







Per cent of fruit. 





Light infestation, 1-10 



Medium infestation, 11- 



Heavy infestation, 21- 







scales. 



20 scales. 



over scales. 



Plat. 



Name and dilution. 













3 









£ 









d 











CD 



CD 

 t>0 



a 



"3 



CD 





3 



"3 



CD 



CD 



bo 



6 



~ 









'3 



5 



'a 

 < 



o 



CD 



m 



8 

 ffl 



2 



8 



'a 

 < 



o 

 02 



U 

 C3 



'8 



6 



'3 



< 



M 

 o 



(D 



CO 



I 



Lime-sulphur, 1-7 . . 



23. 954 



33.554 



38. 016 



26. 737 



0.271 



13.245 



8.677 



3.598 



0.108 







2.066 



1.028 



II 



(1) Commercial so- 

 dium sulphid, 





























12.5 pounds-SO 



36. 167 



50. 000 



67. 021 



10. 000 



3.377 



6.535 



6.382 







1.397 



1.960 



6.382 







III 



Caustic potash, 11 

 pounds +sulphur, 





























12.5 pounds-50 



61. Ill 





49. 738 



42.312 



11.011 





7.339 



6.570 



2.777 





12. 041 



11. 628 



IV 



(2) Commercial so- 

 dium sulphid, 

































46. 666 



39.916 







12. 873 



14. 705 







1.839 



12. 605 





V 



Caustic soda, 11 

















pounds -t-sulphur, 





























12.5 pounds-50 



20.005 



36. 690 



48.571 





1.018 



21.561 



7.857 





.268 



7.19 



2.142 





VI 



Lime-s u lphur , 1-7 + 

 nitrate of soda, 50 





























pounds-50 



22. 305 





40. 707 



20. 000 



1.313 





5.309 







.093 





3.539 







VII 



Caustic soda, 15 

 pounds+sulphur, 





























17.1 pounds-50 



9.797 



46. 153 



28.365 



39. 731 



.261 



1.398 



.961 



4.418 



.065 



.699 



.480 



.959 



VIII 



Caustic potash, 15 

 pounds+sulphur, 





























17.1 pounds-50 



10.663 



21.229 



43. 722 





.090 







2.661 













1.901 





IX 



Check — unsprayed . . 



25. 654 48. 829 



18.356 



33. 281 



6.358 



14.046 



9.205 



18.506 



15.393 



11.705 64.383 



41.372 



Table XX.- 



-San Jose scale insecticide investigations (commercial table), Benton Harbor, 

 Mich., 1914. 



Plat. 



Name and dilution. 



Number 



Total 



of count 



number 



trees. 



of fruits. 



19 



2,925 



11 



2,127 



7 



2,721 



5 



673 



7 



2,144 



11 



1,074 



8 



2,403 



8 



1,558 



49 



14,693 



Per cent of fruit. 



Free from 

 scale to 



light infes- 

 tation, 

 market- 

 able. 



Medium to 

 heavy in- 

 festation, 



unmarket- 

 able. 



I 



II 



III 



IV 



V 



VI 



VII 



VIII 



IX-XI 



Lime-sulphur, 1-7 



(1) Commercial sodium sulphid, 12.5 pounds-50. 

 Caustic potash, 11 pounds +sulphur, 12.5 pounds-50 



(2) Commercial sodium sulphid, 12.5 pounds-50... 

 Caustic soda, 11 pounds+sulphur, 12.5 pounds-50. 

 Lime-sulphur, 1-7+nitrate of soda, 50 pounds-50. . 

 Caustic soda , 15 pounds+sulphur, 17. 1 pounds-50 . . 

 Causticpotash, 15 pounds+sulphur, 17.1 pounds-50 

 Checks — unsprayed 



98. 052 

 94.359 

 83.352 

 80.833 

 97.942 

 98.511 

 98. 378 

 99. 167 

 60. 793 



1.948 

 5.641 

 16. 648 

 19. 167 

 2.058 

 1.489 

 1.622 

 .833 

 39.207 



Although the spray materials were subjected to a severe test, all, 

 with the exception of the materials employed in Plats III and IV, gave 

 satisfactory results. Lime-sulphur was used alone and also in combi- 

 nation with nitrate of soda. The addition of sodium nitrate did not 

 affect the insecticidal value of the lime-sulphur. These plats yielded 

 98.052 and 98.511 per cent of marketable fruit, respectively. The 

 homemade sodium and potassium sulphur solutions, with the excep- 

 tion of the materials used in Plat III, gave 97.972 to 99.167 per cent of 



