31 THE KEFOET OF THE No. 36 



but continuously along, Ihe advantage iu sa\dng of time would not be great were 

 it not that it takes a good while to fill up the tank with liquid, whereas it requires 

 only a minute or two to till the hopper with dust. On these small trees the dust 

 method would probably be from two to four times as rapid as the liquid. 



CoMPAKisoN OF Cost on Large Trees. 



The following data for the large apple trees sprayed by us give what I believe 

 to be a fairly accurate estimate of the cost of each kind of spraying where there are 

 no delays of any kind, and where both outfits are working well in every way. 



Cost of Dusting 92 Large Apple Tkees Using 3 lbs. per Tree. 



92 large apple trees at 3 lbs. each = 276 lbs. material at GVuC $17.94 



Gasoline at 35c. per gal -15 



Oil 04 



2 men at 20c. per hour, for l^^ hours .60 



1 team at 30c. per hour, for IVo hours .45 



Total cost for 92 trees . ; $19 . 18 



Average cost per tree 20 . 8c. 



Cost of Si'RAYing 51 Large Trees with Lime^Sulphur and Arsenate of Lead. 



612 gals, dilute lime-sulphur (strength 1.008 sp. gr) = 16i^ gals, com- 

 mercial lime-sulphur at 15c. a gal $2 46 



30% lbs. arsenate of lead at lie 3 36 



Gasoline 60 



Oil : ." V 15 



3 men for 6% hours at 20c 3 82 



1 team for 6% hours at 30c ■ 1 91 



Total cost for 51 trees $12 30 



Average cost per tree 24 . Ic. 



Average cost for dusting ." 20 . 8c. 



Balance per tree in favour of dust 3 . 3c. 



COMPARISON OF COST ON LARGE, SWEET CHERRY TREES. 

 Cost of Dusting 55 Large Trees. 



100 lbs. dust at eVoC. per lb $6 50 



Gasoline 05 



Oil 20 



2 men i/^ hour at 20c , 20 



1 team i/o hour at 30c 15 



Total cost of 55 trees ". $6 92 



Average cost per tree 12 . 6c. 



Cost of Spraying 45 Trees with Lime-Sulphur and Arsenate of Lead. 



160 gals, lime-sulphur (strength 1.008) = approximately ^\\^ gals, com- 

 mercial lime-sulphur at 1 5c. $0 65 



10 lbs. arsenate of lead at lie : . 1 10 



3 men, IV2 hours at 20c 90 



I team, Wi hours at 30c • - . 45 



Gasoline 15 



Oil I • • • • • 05 



Total cost for 45 trees ,. $3 30 



Average cost per tree 7.3c. 



Average cost for dust per tree 12 . 6c. 



■y- Balance in favour of liquid per tree 5.3c. 



