102 Maine Agricultural Experiment Station. 1918. 



on a large scale plot 5 of 1916 and plot 3 of 1917. The remain- 

 der of the orchard was sprayed with standard dilution lime- 

 sulphur containing one pound of dry arsenate of lead in 50 

 gallons, thus duplicating plot 1 of 1916 and plot 5 of 191 7. This 

 orchard, consisting of over 1200 Ben Davis trees, lies directly 

 across the road from the experimental plots in Ben Davis No. 2. 



Spraying Program. 



No sprays were used when the trees were dormant. Unless 

 otherwise specified 3 applications were made, the aim being to 

 make the first when the blossom buds were showing pink, the 

 second just after the petals fell, and the third application 

 between two and three weeks after the second. The dates of 

 application each season are given later. 



Treatment of Plots in 1916. 



Plot I. Standard dilution lime-sulphur, plus one pound of dry, 

 acid arsenate of lead to 50 gallons. 



Plot 2. Same spray treatment as plot 1, but using Friend calyx 

 nozzle. 



Plot 3. Standard dilution lime-sulphur plus one pound of ar- 

 senate of lime to 50 gallons. 



Plot 4. First application omitted, otherwise like plot 1. 



Plot 5. Blossom bud application, lime-sulphur 20 per cent 

 stronger than standard dilution, plus one pound of dry, 

 acid arsenate of lead to 50 gallons. Later applications 

 two pounds of dry, acid arsenate of lead alone in 50 

 gallons. 



Plot 6 Dry, acid arsenate of lead alone, two pounds in 50 

 gallons of water. 



Plot 7. Bordeaux mixture, 3-3-50, plus one pound of dry, acid 

 arsenate of lead in 50 gallons. 



Plot 8. Sherwin-Williams dry lime sulphur, using for dilu- 

 tion in water 3 pounds of the powder as an equiva- 

 lent of one gallon of a 33 ° B. concentrate and adding 

 one pound of dry acid arsenate of lead to each 50 gal- 

 lons of diluted spray. 



Plot 9. Unsprayed check. 



