18 



attached to a single spray pole, and 50 gallons were required to cover 

 the trees. Row 7 was sprayed the same day, using three nozzles, and 

 35 gallons of spray were required. During the other sprayings a 

 double Vermorel nozzle was used and an average amount of 35 gal- 

 lons per row was applied. 



Mr. Hudson used a little over 22 gallons per row. 



COST OF TREATMENT. 



Estimating the average amount of material used as 35 gallons per 

 row, or 3^ gallons per tree, and counting the cost of disparene at 15 

 cents, copper sulphate at 6f cents, and lime at one-half cent per 

 pound, the cost of material for treating this block is shown below in 

 Table III. 



The arsenate of lead made by Mr. Hudson is based on arsenate of 

 soda at 8-| cents and acetate of lead at 10£ cents per pound. 



Table III. — Cost of material used in spraying. 



Row 



No. 



First spraying. 



Second spraying. 



Third spray- 

 ing. 



Total j Cost per 

 cost. tree. 



1 

 2 



Arsenate of lead and Bor- 

 deaux, 

 do 



Arsenate of lead and Bor- 

 deaux. 

 do 



Disparene ... 

 do 



$0.71 ; $0.07ft 

 .71 .07ft 



3 



No . ----- 



No 



No . 



No 





4 



Disparene 



Disparene and Bordeaux. . 

 Disparene 



Disparene and Bordeaux. _ 

 Arsenate of lead and Bor- 

 deaux. 

 .... do 



Disparene ... 

 ... do . . 



.63 



.83f 



• 94| 



1.35a 



.71 

 .71 



■ 06ft 



■ 08i 



5 



No .. 



6 



8 

 9 



Disparene 



Disparene and Bordeaux 



Arsenate of lead and Bor- 

 deaux. 

 do 



do 



do 



do 



do 



do 



.0% 



.m 



.07ft 



• 07ft 

 .07ft 



10 



do 1 do 



1 



It is quite usual in reporting the results of spraying for the codling 

 moth to ignore the amount of fruit that is ruined by the first brood 

 of moths or make a general estimate of it. The picked fruit is then 

 considered, and the percentage of wormy apples is based on the count 

 of a few bushels from trees treated in different ways, or a general 

 estimate is given of the amount of sound and wormy fruit. 



As a matter of fact, the fruit continues to drop from the time the 

 worms begin to feed until it is harvested. 



In this experiment all windfalls were counted August -1 and removed 

 from beneath the trees, and as examination showed that worms were 

 present in the apples it was considered proper to class this fruit as 

 having been destro} 7 ed by the first brood of moths. 



All the fruit remaining on the ground under the trees was removed 

 and counted before harvesting began and, together with the wormy 

 picked fruit, was considered as having been attacked by the second 

 brood. Upon these counts and the counts of the sound apples picked 

 and blown to the ground, the table of percentages is based. 



