190 MANUAL OF VEGETABLE-GARDEN INSECTS 



Fig. 115. — The celery leaf-tyer, pupa ( X 5). 



and burdock. The caterpillars have been occasionally found 

 feeding on celery and beet in August and September. 



The full-grown 

 caterpillar (Fig. 

 114) is f inch 

 in length, trans- 

 lucent greenish 

 white with a pair 

 of black spots on 

 the cervical shield. The body is marked with a dark green 

 median stripe bordered by a much wider greenish white one. 

 When disturbed the caterpillar has the habit of wriggling 

 actively back and forth. The larva generally 

 feeds openly on the under surface of the 

 leaves, but sometimes it forms a retreat by 

 webbing together several leaves loosely with 

 silk. Under greenhouse conditions, the cater- 

 pillars mature in about three weeks. Pupa- 

 tion takes place within thin white, silken 

 cocoons spun within folded leaves. The 

 pupa (Fig. 115) is a little less than ^ inch in 

 length and dark brown or black. The pupal "^^th (x i|). 

 period varies from twelve to twenty days. In one instance 

 emerge until a year after the pupa was 

 formed. The moth (Fig. 116) has an 

 expanse of about | inch and is rusty 

 brown with somewhat obscure blackish 

 markings on the front wings. The 

 flight of the moths is short and jerky and 

 on alighting they quickly hide on the 

 underside of the object. The small, flat, 

 elliptical, translucent eggs (Fig. 117), 

 Fig. 117. — Eggs of the ^^out ^ inch in diameter, are deposited 

 celery leaf-tyer (X 22). on the Underside of the leaves in small 



Fig. 116.— The cel- 

 ery leaf-tyer 



the moth did not 



