THE APPLE LEAF-SEWEB. 



9 



These moths were supplied with honey and water. Several moths 

 were given no food or water and several were given water alone. 

 The former lived only a few days after emergence and the latter lived 

 a shorter period than those supplied with both water and honey. 



The moths fed upon water and honey lived from 5 to 18 days, the 

 average of 11 observations being 10.3 days. No data were obtained 

 upon the relative longevity of the sexes. 



HABITS OF MOTHS. 



The moths are active during the day, especially in the morning, at 

 which time they appear to deposit most of the eggs. In the rearing 

 cages they are rather inactive, spending most of the time resting on 

 the underside of the leaves, with their wings tightly folded (fig. 6, &). 

 In the orchard they are active, making short, quick, erratic flights 

 from one portion of the tree to another. The moths are so small and 

 so adept at hiding that they are seldom observed in the orchard. 



INCUBATION OF EGGS. 



The shortest incubation period observed was 7 days, the longest 13 

 days, and the average for 16 lots of eggs 8.8 days. As a rule, the 

 incubation period for the individual eggs of a given lot varied only 

 a few hours, and in recording observations for any lot of eggs incuba- 

 tion was considered over when the first egg hatched. Table IV shows 

 the incubation period of the eggs. 



Table IV. — Incubation period of eggs of apple leaf-sewer, Winchester, Va., 1915. 



Numljer of eggs 

 observed. 



25 



Jime 2 

 June 5 

 June (J 

 June 7 

 June 8 

 Juno i) 

 Juno 11 

 Juno 12 

 Juno 1:5 

 Juno 14 

 Juno IT) 

 Juno Ki 

 Juno 17 

 Juno IH 

 JiMio !!) 

 June 21 



6 



13 



24 



63 



52 



.39 



02 



41 



48 



23 



17 



28 



21 



6 



6 



Average. 



Date — 



Depos- 

 ited. 



Hatched. 



June 15 

 June 14 

 June 15 

 June 16 

 Juno 17 

 ...do.. .. 

 June IS 

 Juno 19 

 Juno 20 

 June 22 

 June 23 

 Juno 25 

 June 2ti 

 Juno 25 

 Jiuie M) 

 July 2 



Period 

 of incu- 

 bation. 



Days. 

 13 



