INSECTS INJURIOUS TO CELERY, PARSNIPS, ETC. 



i8] 



This moth resembles that of the garden webworm (page 6l). 

 The larva is green or greenish yellow, somewhat translucent, 

 with whitish head, marked with purplish dots (fig. Ii6, e, d, f). 



This is an introduced species, and obviously of tropical origin. 

 Owing to its adaptability to indoor habits -it is likely to be 

 found anywhere. 



The leaf-tyers work usually on the under surfaces of leaves, 

 or on such as are shaded by other leaves. When young they 

 eat out small holes on the under surfaces, leaving the upper 



Fig. 11 6-— Celery leaf-tyer. a. Moth; b, same in natural position at rest; c, egg mass; 

 d, larva from above; e, same from side; /, head of same; g, pupa case; h, chrysalis. 

 a, b, d, e. g, h, One-half larger than natural size; c, twice natural size; /, more enlarged 

 (original). 



epidermis untouched; but as they increase in growth the 

 leaves are skeletonized and sometimes entirely devoured. Larvae 

 work chiefly at night and rest by day in the same locations. 

 They prepare for transformation to pupae by spinning up be- 

 tween two leaves, or by rolling up a case at the edge of a leaf. 

 (See fig. ii6, g). Owing to the somewhat secluded manner 

 of life of the larva, attack is not noticeable until considerable 

 injury is done; but its presence can be readily ascertained by 

 striking the plants lightly, when the moths start up, fly a short 

 distance, then alight, and disappear under a leaf. In mid- 

 summer the entire life cycle, according to the writer's observa- 



