THE CANADIAN ENTOMOLOGIST 



139 



Effect of Fruit Worm in Reducing Set. 



In the check plots we found 12.44 per cent, of the picked 

 fruit showing Fruit Worm injury. Observations during June 

 showed that 72.48 per cent, of the young fruits injured by Fruit 

 Worms drop to the ground before maturity. So the number of 

 apples which fell in the checks was 32.75 per cent, of the total set 

 on 67.28 apples were grown where 100 would have grown if no 

 Fruit Worms had been present. Spray 2 and 3 reduced this injury 

 by 65.19 per cent, and so increased the set from 67.28 apples to 

 88.61 apples or an increase in set of 31.7 per cent. 



TABLE SHOWING INCREASE IN SET DUE TO BUD-MOTH AND 

 FRUIT WORM CONTROL. 



Due to 



Fruit Worm . . . 

 Bud-moth , 



Per cent, drop 

 due to insect 

 injury. 



32.72 

 45. 



Per cent, set in 

 unsprayed plots 



67.28 

 55. 



Per cent, benefit 

 by spraying in 

 controlling in- 

 sects. 



65.10 

 60.75 



[Per cent, in- 

 Per cent, set crease in set 

 wiien sprayed, [due to insect 

 control. 



88.61 



82. 



Total increase in set . 



31.7 

 49.09 



80.79% 



Or where in the treated plots we grew 100 apples in the untreated 

 plots we grew 55 apples. 



Bud-moth Injury to the Picked Fruit 



In estimating Bud-moth injury to the picked fruit, the counts 

 in the various plots varied greatly, depending on the crop, size of 

 the leaves, etc., so that no accurate idea of control .beyond the 

 general benefit in reducing Bud-moth could be gathered. The 

 whole twelve plots averaged 44.7 per cent. Bud-moth infestation 

 in the buds, while 9.5 per cent of the total crop of apples had 

 leaves tied up to them, the surface showing injury by the young 

 larvae. A total injury of about one apple to every five buds 

 injured in the spring. All apples injured by Bud-moths under the 

 present interpretation of the Fruit Marks Act are packed as No. 3's 

 or "culls," the injury being properly classed as "causing material 

 waste." 



Fruit Worm Injury to the Picked Fruit 



In the check plots the total Fruit W^orm injury was 12.44 per 

 cent, of the picked fruit. Of these 39.5 per cent., or 4.97 per cent, 

 of the total, were so damaged as to be fit only for No. 3's or culls. 



