126 



mixtures. This probably is due to the faet that the home- 

 jiiade mixtures contain a larger excess of lime than the eom- 

 mercial mixtures, thus decreasing the amount of free 

 arsenic. 



There has been more or less agitation during the last few 

 years in regard to the use of a combination of finely divided 

 sulfur and arsenate of lead in controlling insect and fungus 

 troubles. Experiments to test the value of such a combina- 

 tion have been conducted at the New Jersey Experiment 

 Station for two years. The following comparisons have 

 been made on ai)ple trees : 



First, Pyrox. second commereial eoncentrated lime-sul- 

 fur mixed with arsenate of lead, third a solution made by 

 mixing finely divided sulfur containing 10% arsenate of 

 lead with water at the rate of 10 ])ounds to fifty gallons of 

 ""A ater and fourth the same combination of finely divided 

 sulfur and arsenate of lead applied as a dust. Each experi- 

 ment included a check plot that received arsenate of lead 

 only. Separate apj^lications of black-leaf -10 were made to 

 each plot to control aphis. 



Our experiments with i)eaches include the same com- 

 bination of finely divided sulfur with arsenate of lead ap- 

 plied wet and as a dust ; together with feelf-boiled lime-sulfur 

 £>nd atomic sulfur. Records were taken to determine the 

 amount of injury caused by codling moth, scab and curculio. 

 as well as any injury that might be caused by the material 

 itself. AVithout going into details a few brief statements 

 showing our results and conclusions may be of interest. The 

 arsenate of lead used alone did not spread satisfactorily and 

 failed to protect the fruit from curculio injury. This was 

 more evident on apples than on peaches. The damage by 

 •curculio and codling moth was very slight on all other apple 

 plots. The api^les on the check plots were seriously enough 

 injured to present a decidedly unsatisfactory appearance. 

 The api)le scab control was over 90% on all plots except the 

 one receiving only arsenate of lead. The apples from the 

 trees sprayed Avith Pyrox Avere slightly russetted. This 



