30 BUI. I. mix 500, U. S. DEPARTMENT of agriculture. 



Table XVIII. — Cost of operation for ,1-mert, .'-horse spraying erew. 



Spray. 



Number 



of 

 records. 



Normal 

 time. 



Acres 

 per 

 day. 



Gallons 

 per 

 acre. 



Gallons 

 per 

 tree. 



Labor 

 cost 

 per 

 acre. 



Mate- 

 rial 

 cost 

 per 

 acre. 



Total 

 cost 

 per 

 acre. 





22 



6.8 



4.4 



358 



5.1 



$2.38 



$8. 23 



$10. 61 











90 

 87 

 74 

 50 

 33 

 17 



7.81 

 7.62 

 7.62 

 7.83 

 7.81 

 7.98 



3.8 

 3.9 

 3.9 

 3.8 

 3.8 

 3.8 



519 

 462 

 480 

 514 

 542 

 585 



7.1 



6.3 

 6.6 

 7.1 

 7.6 

 8.4 



2. ;:■: 

 2.67 

 2.67 

 2.74 

 2.73 

 2.79 



2.15 

 1.91 

 1.98 

 2.05 

 2.17 

 2. 34 



4.88 





4.58 



Third lead arsenate spray 



4.65 

 4.79 





4.90 





5.13 







All lead arsenate sprays 



351 



7.73 



3.8 



501 



6.8 



2.71 



2.07 



4.78 



Table XIX. — Cost of operation for 2-men, 2-horse spraying creio. 



Spray. 



Number 



of 

 records. 



Normal 

 time. 



Acres 

 . per 

 day. 



Gallons 

 per 

 acre. 



Gallons 

 per 

 tree. 



Labor 

 cost 

 per 

 acre. 



Mate- 

 rial 

 cost 

 per 

 acre. 



Total 

 cost 

 per 

 acre. 





4 



6.14 



3.3 



324 



4.6 



$2.46 



$7.45 $9.91 









23 

 26 

 23 

 17 

 12 

 5 



6.21 

 5.53 

 5.60 

 5.38 

 5.27 

 4.97 



3.2 

 3.6 

 3.6 

 3.7 

 3.8 

 4.0 



550 

 458 

 446 

 490 

 531 

 532 



7.4 

 6.2 

 6.0 

 fi.6 

 7.2 

 7.6 



2.48 

 2.21 

 2.24 

 2.15 

 2.11 

 1.99 



2.27 

 1.89 



1.S4 

 1.96 

 2.12 



2.13 



4.75 





4.10 





4.08 





4.11 





4.23 





4.12 







All lead arsenate sprays 



106 



5.61 



3.6 



491 



6.6 



2.24 



2.03 



4.27 



Table XX. — Summary of comparative efficiency data for spraying crews. 



Crew. 



Number 

 of sprays 

 studied. 



Normal 

 time man- 

 hours. 



Acres per 



Gallons 



Gallons 

 per tree. 



Cost per acre. 



day. 



per acre. 



Labor. 



Material. 



Total. 



3-2 



351 



106 



7.73 

 5.61 



3.8 

 3.6 



501 

 491 



6.8 

 6.6 



2.71 

 2.24 



2.07 

 2.03 



$4.78 



2-2 



4.27 







LIME-SULPHUR SPRAY. 



The lime and sulphur is applied during the dormant season, usually 

 during February or March, and is applied primarily for the San Jose 

 scale, and, as the growers express it, to "clean up the trees." As 

 stated above, comparatively few growers were using this spray when 

 the records here presented were obtained. The average solution 

 used is 1 to 10; that is, 20 gallons of lime-sulphur and 200 gallons of 

 water. 



APHIS SPRAYS. 



Another spray sometimes applied separately, but usually in con- 

 junction with one of the lead arsenate sprays, is the aphis spray. In 

 Mesa County on the farms studied there was no record of the use of 



