FIFTY-FIRST ANNUAL REPORT. 60 



tions were made but weather conditions were not always favorable. 

 I shall not give detailed results of this experiment but only a general 

 statement. The results were not uniform on all varieties but averaged 

 good. The unfavorable atmospheric conditions probably had some- 

 thing to do with the results and the prevalence of such conditions in any 

 given location should be a deciding factor when considering dusting. 



At Fennville on the Broe farm a comparison was made on pears be- 

 tween sulphur dust and Bordeaux. Both plots were sprayed in the 

 prepink stage with strong lime-sulphur for scab and psylla and there were 

 no check trees left because of the prevalence of pear psylla. There were 

 several varieties in the orchard but only Bartlett was used for making 

 counts at harvest and the control of scab was uniformly good on both 

 plots there being only about 2% scab on either. It must be remembered 

 in considering these results that the dust plot had the pre-pink applica- 

 tion of strong lime-sulphur which I consider to be a critical application 

 for scab control. The foliage in the dusted plot was in excellent condi- 

 tion and the dusted fruit had what we may call a better "finish" than 

 the sprayed fruit which showed considerable russetting. 



Another test was made on the Broe farm with Wealthy apples. The 

 orchard was divided into three plots as follows: 



1. Check, 



2. Sulphur dust — six applications. 



3. Sprayed — 4 applications lime-sulphur and 1 of bordeaux. 



A pre-pink application was planned but could not be put on because 

 of a shortage at that time of dusting material. The results are given in 

 the following table: 



III— SCAB AND CODLING MOTH CONTROI^-WEALTHY APPLES— 1921 



The figures show that the control of scab on both plots was about the 

 same but spraying gave considerably better results than dusting in 

 codling moth control. I want again to call particular attention to the 

 amount of early scab which is about uniform in all plots. 



A similar experiment was made in the same orchard with Jonathans 

 but the check plot showed so little injury that the results will not be 

 given. 



PARADICHLOROBENZENE FOR PEACH BORER CONTROL. 



There has been considerable work done in the state during the last 

 two seasons with paradichlorobenzene for peach borer control. The 

 Horticultural Department has had several extensive trials and Professor 



