I70 MAINE AGRICULTURAL EXPERIMENT STATION. I916. 



Plot 3. Blossom bud application lime-sulphur 20 per cent 

 stronger than standard, plus one pound of dry 

 arsenate of lead to 50 gallons ; later applications 

 two pounds of dry arsenate of lead alone in 50 

 gallons of water. 

 Plot 4. Blossom bud application 3-3-50 bordeaux mixture, 

 plus one pound of dry arsenate of lead in 50 gal- 

 lons; later applications like those on Plot 3. 

 Plot 5. All applications dry arsenate of lead alone, two 



pounds in 50 gallons of water. 

 Plot 6. All applications extra fine sulphur 10 pounds, dry 



arsenate of lead 1 pound, water 50 gallons.* 

 Plot 7. All applications 3-3-50 bordeaux mixture plus I 



pound of dry arsenate of lead in 50 gallons. 

 Plot 8. Treatment like plot I, plus a previous application of 

 dormant strength lime-sulphur after the leaf buds 

 began to open, but the buds still small and the 

 young leaves closely imbricated. 

 Plot 9. Unsprayed check. 



Plots 1, 7 and 9, sprayed with standard dilution lime-sulphur, 

 bordeaux mixture, and unsprayed respectively, were introduced 

 as checks upon which to make comparisons in judging the re- 

 sults obtained upon the other plots. 



Plot 2 was used to test, in comparison with plot 1. the effi- 

 ciency of the spray application made when the blossom buds 

 are showing pink. Omitting this application in previous ex- 

 periments had by no means always resulted in a material in- 

 crease in the amount of scab on the leaves and fruit. This 

 part of the experiment has now been carried on for four suc- 

 cessive seasons. 



Plots 3 and 4 represent a modified spraying practice which 

 previous work in connection with this series of experiments 

 suggested as applicable to Maine conditions. The idea is to 

 use a strong fungicide combined with a moderate amount of 

 arsenate of lead when the blossom buds are showing pink, but 

 for later protection both against apple scab and chewing insects 

 to depend entirely on arsenate of lead, — using a larger quantity 

 for subsequent applications. 



*For method of preparation see page 180 of Bulletin 240 of this 



Station. 



