1917 



ENTOMOLOGICAL SOCIETY. 



37 



sulphur and calcium arsenate burned the foliage very severely, causing fully half 

 of the leaves to drop and leaving dead spots on most of the remainder. 



2. Effect on Apple Scab.— On each of the plots apple scab was well controlled. 

 The liquid sprayed parts were a little better than the dusted, but not much. There 

 IS no doubt that fully 99 per cent, of -the fruit in the lime-sulphur and 

 arsenate of lead plot was free from scab. The soluble-sulphur and calcium 

 arsenate plot gave at least 98 per cent, free and the dusted part averaged as nearly 

 as we could judge 97 per cent., though one Greening tree situated at the extreme 

 north-east corner where it was difficult to dust it thoroughly had about 10 per cent, 

 scab, and a Spy tree possibly 8 per cent. A count at picking time of 1,500 apples 

 on a dusted Yellow Harvest, a variety very subject to scab, gave 51 scabby apples, or 

 3.4 per cent., leaving 96.6 per cent, free of scab. A count of 400 Red Astrachans, 

 nearly all there were, gave 12 scabby = 4 per cent., leaving 96 per cent, clean. 



Neither my assistant-nor T could be present at picking time owing to College 

 duties, but we examined carefully at the end of August every Baldwin, Greening, 

 ■Russet and Spy tree that had fruit on it on all the plots, and made a note of the 

 number of scabby fruits on each. No further development of scab has taken 

 place since. The results are shown in the following table. 



Table Showixg the Number of Scabby Fruits as Seex ox the Trees at the End of 



August. 



Varety 



No. ' f Trees 



Mixture used 



No. of Scabby 

 Fruits 



R. I. Greening. 



Baldwin, 



Golden Russet 



Spy 



12 

 12 

 10 

 61 

 10 



6 



3 



2 



2 



1 

 Part of 1 tree a grafi 



Dust. 



Li-sul and arsenate ofi 

 lead 



Sol-sul and calcium ar-[ 

 senate [ 



Dust 



Sol-sul and arsenate ot 

 lead j 



Sol-sul and calcium ar-| 

 senate 



Dust 



Li-sul and arsenate of 

 lead 



Sol-sul and calcium ar- 

 senate 



Dust 



i 



Li-sul and arsenate of 

 lead 



(55 of these 

 J 20 on one tree) 



10 



38 



102 



1 



3 



4 



1 



2 



50 

 



These figures do not of course represent the total number of scabby fruit, but 

 Ave believe that they do represent at least lialf the total number. Since writing 

 the above Mr. W. E. Biggar, the Provincial Fruit Pcsts^Inspector, has counted, 

 many bushels of the dusted fruit picked from various trees and corroborates my 

 estimate of the percentage of clean fruit. The dusted part of the orchard I esti- 

 mated to have over 300 barrels of a crop, the other about 85. Some trees were 

 heavily loaded, others very lightly. 



ChecTcs. — On the mountain side Baldwin trees averaged approximately 50 per 

 cent, scabby fruit. Golden Russets approximately 10 per cent. There were no 

 Greenings or Spys. On the row of ten trees on the adjoining farm, where the trees 



