22 



BULLETIN 446, TJ. S. DEPARTMENT OF AGRICULTURE. 



codling-moth larva. A crew of 3 men and 2 horses will spray 3.35 

 acres in 10 hours, applying 6.7 gallons per tree, or 539 gallons per 

 acre. 



The second codling-moth spray is usually applied from May 20 to 

 June 1 . The Bordeaux or Termor el nozzles are used with a fine spray, 

 and a pressure of from 150 to 175 pounds is maintained. It is the 

 purpose of this spray to cover the small apples with material for 

 protection against the first brood of codling-moth larva, which begins 

 to appear at this time. A crew of 3 men and 2 horses will spray on 

 the average 3.59 acres in 10 hours, applying 6.2 gallons per tree, or 

 505 gallons per acre. 



The third codling-moth spray is usually applied from July 20 to 

 July 31. The Bordeaux or the Vermorel nozzle is used with a fine 

 spray, and a pressure of from 150 to 175 pounds is maintained. It 

 is the purpose of this spray to cover the apples with material for 

 protection against the codling-moth larva. The second brood of 

 larva is usually hatching at this thne. A crew of 3 men and 2 horses 

 will spray 3.64 acres in 10 hours, applying 5.9 gallons per tree, or 478 

 gallons per acre. 



Table XIV. — Labor and material costs per acre for spraying where a crew of 3 men and 2 



horses is used. 



Kind of spray. 



Per acre. 



Gallons. 



Number 



of 

 growers. 



Man- 



Horse- 



Labor 



hours. 



hours. 



cost. 



8.79 



5.86 



S3. 08 



8.95 



5.97 



3.13 



8.34 



5.56 



2.92 



8.24 



5.49 



2.88 



9.66 



6.44 



3.38 



Per Per Per 

 dav. acre. tree. 



Mate- 

 rial cost 

 per 

 acre. 



Lime-sulphur i 



First lead-arsenate -. . 

 Second lead-arsenate . 

 Third lead-arsenate. . , 

 Fourth lead-arsenate. 



1.734 

 1,804 

 1,812 



1. 740 

 1.743 



494 

 539 

 505 

 47S 

 561 



6.1 

 6.7 

 6.2 

 5.9 

 6.9 



SS.89 

 2.15 

 2.02 

 1.91 

 2.24 



i Lime-sulphur, strength 1 to 10. 



2 Lead-arsenate, strength 2 pounds to 50 gallons of water. 



There are a few orchardists who make a fourth lead-arsenate spray 

 the latter part of August or the first of September. 



Lead-arsenate is used with a strength of 1+ to 2 pounds of material 

 to 50 gallons of water in all codling-moth sprays. 



Of the 85 records considered in spraying, 84 made the "'dormant 7 ' 

 lime-sulphur spray; 22 made only the first codling-moth spray; 22 

 made only the first and second codling-moth sprays; 37 made the 

 first, second, and third codling-moth sprays; 4 made the first, sec- 

 ond, third, and fourth codling-moth sprays. In all sprays con- 

 sidered, there was an average of 81 trees per acre, with an average 

 age of 11.5 years. 



