164 MAINE AGRICULTURAL EXPERIMENT STATION. 1916. 



of the Bells Early tree the insecticide was applied to the trunk, 

 large limbs and foliage of the lower branches. 



The orchards containing 47 and 38 trees were within 100 

 feet of other untreated orchards and apple trees in dooryards, 

 and the higher infestation is seemingly due to the invasion of 

 the apple fruit flies. A Tolman Sweet tree in each orchard 

 (Map, T4 and T5) showed that 32 per cent and 34 per cent 

 of the apples were infested compared with 100 per cent mag- 

 goty fruit on the control or check trees. A Wealthy (Map, W) 

 showed that 57 per cent O'f the apples were infested and this 

 represents the highest infestation under orchard conditions in 

 the season of 191 5. 



RESULTS IN RESIDENTIAL DISTRICT. 



Lounsbury* of South Africa, demonstrated that the Mediter- 

 ranean fruit fly can be controlled with the poisoned bait spray 

 under town conditions even where summer rainfall is heavy. 

 We, therefore, decided to test the value of the poisoned sweet 

 as a means of combating the apple fruit fly in the residential 

 section of Orono, Maine. The residential district in the 

 experimental area contained 274 apple trees scattered in vacant 

 lots and dooryards. 



Some of the occupants informed us that certain varieties of 

 apples had been seriously infested by the apple maggot for ten 

 years. In some yards all of the infested fruit was allowed to 

 decay on the ground, and in others, some or all of the drops had 

 been gathered during previous years. Poultry was fenced off 

 in some of the back yards below the apple trees and in others, 

 the fowls were allowed to run at large. 



The following table shows the results of two seasons' spray- 

 ing in the residential district: 



