EXPERIMENTAL SPRAYING AT HIGH MOOR FARM. 85 



number of days which elapsed between the first and second 

 applications were as follows: 25 in 1910, 18 in 191 1, 12 m 

 1912, 26 in 1913, 14 in 1914, and 20 in 1915. 



In all cases arsenate of lead has been added as an insecticide 

 to the various, so-called fungicidal sprays at the rate of two 

 pounds of paste or one pound of dry powder to each 50 gallons. 

 This amount has always, proven sufficient for the control of 

 chewing insects. The powder has been used exclusively in the 

 more recent experiments. At first a plot sprayed with this 

 amount of poison in water alone was used as a check. After 

 the marked fungicidal effects of arsenate of lead were noticed 

 a check plot was reserved which received no spray whatever. 



In Mr. Bonns first experiment in 1910 a hand-pump, barrel 

 outfit was used, while in 191 1 his applications were all made 

 with a Niagara carbonic acid gas sprayer. Since that time a 

 large gasolene power sprayer, carrying two leads of hose, has 

 been used exclusively. After each plot receiving a different 

 treatment was sprayed the entire apparatus, including tank, 

 pump, hose, extension rods and nozzles was thoroughly washed 

 and flushed with clean water. Throughout the work nozzles 

 of a type which deliver a fine mist have been employed, and 

 the sprays applied with a pressure varying from 150 to 200 

 pounds. The person in charge remained in the field in- constant 

 supervision of the spraying crew while the applications were 

 being made, care being taken to see that all of the foliage on 

 each tree was reached as nearly as possible without applying 

 sufficient spray to cause excessive dripping. 



Detailed Discussion of Combined Results. 



Bordeaux mixture vs. lime-sulphur : Each season during the 

 6 years plots have been sprayed with bordeaux mixture and 

 standard dilution lime-sulphur prepared from a concentrate 

 made on the farm.* For this purpose during the last 4 years 

 a 3-3-50 bordeaux mixture has been used exclusively. Except 

 in the earlier work before the relative merits of the two funsfi- 



*Standard dilution lime-sulphur as used in this publication signifies 



the equivalent of a 1 to 40 dilution of a 33 B. concentrate, or 1.22 



gallons of a concentrate having this test diluted to 50 gallons wivh 

 water. 



