66 



N. H. AGR. EXPERIMENT STATION 



[Bulletin 143 



sons. Among other methods used for securing the exact knowl- 

 edge concerning them, was that of erecting a large frame cov- 

 ered with cheese cloth 

 over a ten-year-old ap- 

 ple tree and introduc- 

 ing in it a single pair 

 of the codling moths. 

 Before doing so every 

 leaf on the tree was 

 carefully examined to 

 be sure that no eggs 

 had already been laid. 

 The leaves and fruit 

 on the tree were then 

 examined at frequent 

 intervals, every fruit 

 and leaf being ex- 

 amined and each egg 

 marked with a tag as 

 laid. This enabled us 

 to determine exactly 

 when and where the 

 eggs were laid, how far 

 they were from the nearest apples and other points, all of which 

 have a practical bearing upon combating the pest, as will be seen 

 below. Three of tlie.se large cages and numerous smaller ones 

 covering individual limbs or twigs were used. 

 It was found that practically all of the eggs were 

 laid upon the leaves, upon the upper or under 

 surface indiscriminately, and a few, less than 

 two per cent., on the apples and bark. In three 

 years 796 eggs were observed. Large numbers 

 are laid on foliage of limbs not bearing fruit 

 and often on trees with no fruit. The average 

 distance of the egg from the fruit is nine inches, 

 but there seems to be no direct relation between the distance of 

 the eggs from the fruit and the resulting amount of worminess. 

 Our observations indicate that there is a very large mortality of 

 young larvffi from the time they leave the eggs until they enter 

 apples. 



Fig. 5— Egg of codling moth on leaf— greatly en- 

 larged and natural size. 



Fig. 6. — Codling 

 moth egg on ap- 

 ple, about natu- 

 ral size. 



