438 



STATE BOARD OF AGRICULTURE. 



1st. When blossom buds had separated in the cluster. 90-10 sulphur dust 

 and lime-sulphur, lJ^-50, with lead arsenate. 



2nd. When petals had dropped using the same materials as for first appli- 



cation. 



3rd. 

 before. 



4th. 



5th. 



6th. 

 applied. 



Two weeks after second application using the same materials as 



First week in July using the same materials as before. 



July 20 using 90-10 sulphur dust and bordeaux with lead arsenate. 



August 16 using 90-10 sulphur dust. No spraying material was 



This list of applications shows that the sprayed plot was covered five and 

 the dusted plot six times. The lime-sulphur solution was used in this orchard 

 for all applications except the last, because of the tendency of Jonathan apples 

 to russet. The first and second applications were timed according to the 

 development of the bloom of each variety, the Wealthy blossoming earlier 

 than the Jonathan. At all other applications both varieties were treated at 

 the same time. The dusting was always done under favorable conditions, 

 either in the morning or evening or soon after a rain. 



Weather conditions. Except during the period preceding blooming, there 

 was not sufficient rain to make conditions favorable for scab development; 

 but the season was very favorable for codling moth and this insect caused 

 serious losses in most sections of the State. 



RESULTS. 



Jonathan. Records were obtained for this variety at harvest but there 

 was so little injury on the check tree by either scab or codling moth that the 

 results were not conclusive so will not be given. 



Wealthy. When the crop was harvested, the fruit from the one check tree 

 and from four sprayed and four dusted trees was graded and counted to 

 determine the amount of injury by scab and worms. 



Control of scab and codling moth. 

 table 4. 



The results of the counts are shown in 



TABLE 4.— DUSTING AND SPRAYING WEALTHY, 1921. 



These figures show that dusting and spraying gave equally satisfactory 



J control of scab but that the control of codling moth by dusting was not as 



good as by spraying. The "pre-pink" application was not made in this 



orchard so the sprays or dusts applied had no effect on the control of "early 



scab" as shown in the table. 



