DUSTING AND SPRAYING EXPERIMENTS OF 1918 AND 1919. 



19 



Injury to Fruit. There was a slight russeting found on the fruit from 

 most sprayed trees. This was more noticeable where B. T. S. was used. 

 The fruit from dusted trees was very smooth. Frost injury was found 

 throughout the orchard. This was entirely different from the russeting 

 just mentioned. 



Insect Control. There was so little aphis injury on the check that 

 no comparison can be made. Dusting and spraying both gave very good 

 control of codling moth and other chewing insects. The amount of in- 

 jury on the check trees was not very severe, but there was enough for 

 a check on the different materials. 



Scab Control. Sulphur dust and lime-sulphur solution gave about 

 equal control of scab. Control in those plots was nearly complete ex- 

 cept for an early infection which took place before any dusting or spray- 

 ing was done. Dusting gave more uniform control than spraying. 



The dry lime-sulphurs and B. T. & failed in every case to give satis- 

 factory control of scab. The increase in strength of these materials 

 gave very little benefit. 



The tabulated results of all counts made are shown in Table VII. In 

 this table no results are given for the plot sprayed with B. T. S. at the 

 rate of 4 pounds in 50 gallons. The row which was sprayed with this 

 material had several Wealthy trees in it and the Duchess trees that 

 were there did not produce full crops, so no counts could be made. 



TABLE VII. RESULTS WITH DUCHESS AT GRAND RAPIDS, 1919. 



