July, 1914.] THE APPLE MAGGOT. 93 



to feed or drink at spots where poison has persisted may be killed. 

 The conclusion offered is that the adults are not materially 

 attracted to the bait, and that such sprays, or any others so far 

 devised, are without any adequate avail as definite and sufficient 

 protection of the fruit, in the absence of other treatment. 



For the purpose of setting forth data on which the above con- 

 clusions are based, records will be quoted below of various lots 

 of sprayed trees, choosing for the most part only typical lots in 

 which surrounding conditions were accurately known. It is 

 deemed unnecessary to quote all of the many lots sprayed in the 

 course of the three years' work. The detailed records of egg 

 punctures will be found in Table 26. 



RECORDS OF EXPERIMENTS WITH POISON BAIT SPRAYS. 



Season of 1910. 1. Variety, Winter Sweet. Tree located in 

 pasture eighteen yards from Tree 5, below. Fruit infested for a 

 number of years. Bore the previous year, and drops lay in 

 grass. Formula, arsenate of lead 1^ pounds, molasses 3 gallons, 

 water 15 gallons. Three applications: July 13, 28, August 6. 

 Applied with bucket pump, 2^ gallons to each application. 

 Results: total apples examined, 2,499; total punctures, 7,205. 

 Proportion free from punctures, 14 per cent. 



2. Check tree of same variety as the above, and located at 

 another part of pasture. No spray applied. Total apples exam- 

 ined, 1,538; total punctures," 10,523; proportion free from punc- 

 tures, .5 per cent. 



3. Variety, President. Tree located in corner of very wide 

 stone wall and adjacent to other trees, principally Gravenstein, 

 Baldwin and Spy, Fruit badly infested in 1909, and many 

 drops always lodged in stones of wall. Formula, arsenate of lead 

 1 pound, molasses 2 gallons, water 15 gallons. Four applications, 

 made by owner of premises, July 8, 21, 27, August 13, In the 

 words of the owner, the tree was kept well coated with the 

 material. Results: drops examined, 429; total punctures, 1,525, 

 proportion free from punctures, per cent; picked examined, 488; 

 total punctures, 1,520; proportion free from punctures 8,1 per 

 cent. 



