SOLUBLE POISONS IN THE POISONED BAIT SPRAY. 165 



Results of Two Season's Spraying in Residential District. 



Vabieties op Apples . 



Map. 



Picked, 

 1914. 



Picked, 

 1915. 



Apples infested 

 on sprayed tree. 



Apples infested • 

 on check tree. 





1914. 



1915. 



1914. 



1915. 



Munson Sweetf 



D3 



C 



Ul 



A 



Kl 



D4 



X 



T6 



T7 



T8 



T9 



U2 



K2 



Sept. 17 

 Sept. 8 



Sept. 14 



Sept. 14 



Sept. 14 

 Sept. 14 

 Sept. 14 

 Sept. 14 

 Sept. ' 14 

 Sept. 17 



Sept. 24 



Sept. 17 

 Sept. 2 

 Sept. 22 

 Sept. 17 

 Sept. 24 

 Sept. 27 

 Sept. 27 

 Sept. 27 

 Sept. 27 

 Sept. 27 

 Sept. 2 

 Sept. 9 



% 



34 

 96 



14 



99 



84 

 54 

 11 

 13 

 13 

 73 



% 

 49 

 4 

 91 

 64 

 97 

 16 

 41 

 24 

 50 

 46 

 88 

 98 

 80 



/o 



% 

 



99 



100 



4 



Mcintosh Red 



100 

 



Tolman Sweet 



Munson Sweetf 





95 

 95 

 95 

 95 

 100 

 100 































































*Agr. Jour. Union of South Africa, No. 25, pp. 1-7. 



t Indicates that the apples were picked from the same sprayed tree during 1914 and 

 1915, while the varieties not so marked were picked from different trees during the two 

 seasons. 



It is evident from the results recorded in this table that the 

 control of the apple fruit fly with the use of the poisoned bait 

 has been a complete failure in the residential district.. Two 

 Munson Sweet trees (Map, Ui and U2) showed an infestation 

 of 96 per cent and 99 per cent of the fruit after the first sea- 

 son's spraying compared with 91 per cent and 98 per cent 

 after the second season's treatment. In the case of a Coles 

 Quince (Map, C), however, there was a decided improvement 

 of the fruit, 34 iper cent being attacked in 1914, and 4 per cent 

 in 19 1 5. A comparison of the infestation of a treated Mcin- 

 tosh Red and Alexander (Map, D3 and A) with the check 

 trees shows a higher per cent of mlaggoty fruit on the sprayed 

 trees. On the other hand, four Tolman Sweet trees (Map, T6, 

 Ty, T8, and T9) showed an infestation of 24, 46, 50 and 80 per 

 cent compared with 95 per cent on the check trees. 



Attention must be called to the severe infestation of fruit en 

 treated trees situated in dooryards in close proximity to Pro- 

 fessor Woods' orchard (Map, 84) in which there was prac- 

 tically no infestation during the past two seasons. Situated 

 within 450 feet of this orchard were the following varieties of 

 apple trees showing a high per cent of infested fruit: • Tolman 



