SOLUBLE POISONS IN THE POISONED BAIT SPRAY. 163 



It is evident from this table that in the orchard which con- 

 tained 84 trees (Map, 84) 'the results show practically no infes- 

 tation in the season of 1914. From time to time during this 

 season, the drops of different varieties of apples were gathered, 

 'but among the windfalls, only one infested Tolman Sweet 

 apple was found. The Tolman Sweets in this orchard had 

 'been badly infested for a number of years. In 1913 no Tol- 

 man Sweets escaped infestation. In 1914 and in 191 5 the 

 apples were practically free from the railroad worm. In view 

 of the fact that the pest was almost completely controlled in 

 the season of 1914, we are hardly justified in drawing conclu- 

 sions from similar results obtained in 191 5; because since 

 maggots were not present the fall of 1914 we should not ex- 

 pect to have flies the next summer. 



No definite conclusions can be drawn from the results ob- 

 tained in the two orchards containing 31 and 40 apple trees 

 (Map, 31' and 40), due to the fact that no check or control 

 trees of the same variety as the treated trees could be obtained. 

 In 1914, 14 per cent of the iRolfe (Map, R) were infested; 

 whereas, in the season of 191 5, the infestation on this same tree 

 was reduced to 1 per cent. In the season of 19 14. there was a 

 heavy crop of apples, while in the following season there was an 

 exceedingly short crop and one would naturally expect a heavier 

 infestation. 



Definite conclusions, however, can be drawn from the results 

 obtained in the orchard containing 57 trees (Map, 57). A. 

 Tolman Sweet tree (Map, T3) showed an infestation of 40 per 

 cent after the first season's baiting and 3 per cent after the 

 second season's treatment, while the check tree showed 100 per 

 cent maggoty fruit. A Bells Early (Map, B) showed an infes- 

 tation of 55 per cent and 20 per cent during the two> seasons. 

 The Tolman Sweet and Bells Early trees were by no means 

 stripped of their fruit' in the season of 1914, since only 100 

 apples were picked of each variety for examination in each 

 year. It must be noted, however, that the Tolman Sweet tree 

 was sprayed by forcing the poisoned bait into the air so that 

 the minute drops fell over and into the tree, while in the case 



