202 BULLETIN NO. 62. 



near where the larva had been feeding, and on carefully opening it 

 found the larva feeding as a miner, it having already excavated a 

 tunnel about 15mm. long. I then examined the other leaf, in which 

 1 found the larva that had disappeared three days before likewise 

 feeding in the interior of the midrib. The larvae were again 

 transferred to fresh leaves, and by the following morning each had 

 again disappeared within a midrib. Both larvae continued to feed 

 within the midrib until June 16, when one of them, on being trans- 

 ferred to a fresh leaf, refused to eat and soon died. The other, 

 with occasional changes to new pastures, continued to thrive until 

 June 25th, when it was plump and active and apparently in the 

 best of health and spirits. Unfortunately I was then absent from 

 the laboratories for some days, and when I returned the larva was 

 dead. I believe that with careful attention it could have been 

 brought to maturity on a diet of leaves alone. When one considers 

 that it lived and grew for more than three weeks upon leaves that 

 had been severed from the trees sometimes for several days, and that 

 it was apparently more thrifty between June 16 and 25 than in the 

 earlier days of its existence, one must acknowledge that, while the 

 proof is by no means positive, the indications are that codling moth 

 larvae may fully develope on a diet of perfectly fresh apple leaves 

 without ever having tasted fruit." 



From the foregoing it seems very probable that in a state of 

 nature which is usually more favorable for insect life than uwder 

 artificial conditions, however well adjusted, the larvae could come 

 to maturity on a diet of leaves alone. 



REMEDIAL AND PREVENTIVE TREATMENT FOR THE CODLING MOTH. 



MAINTAINING A WHOLESOME PUBLIC SENTIMENT. 



Lack of appreciation of the importance of the production of 

 apples reasonably free from the Codling moth is responsible in a 

 large measure for the enormous losses suffered from this insect in 

 some parts of the United States. The producers of fruit are not 

 alone the ones affected by lack of sentiment in this respect for the 

 general public inevitably receives a poorer quality of fruit for its 

 money if pests are not controlled. It is to the interest of both 

 the producer and the consumer that such a public spirited sentiment 



