The Raspberry-Canr Maggot. 



59 



After thus checking the growth in May, the maggot proceeds 

 to burrow its way downward in the pith and finally reaches the 

 base of the shoot at or near the surface of the ground. This point 

 is usually reached sometime in June. 



Pupation. — By July ist, many of the maggots had undergone 

 a transformation in the lower end of their burrow. Their skin 

 had hardened, turned dark brown in color, and inside Wns, pupa- 

 rium, the insect was passing through the pupa stage, preparatory 

 to becoming an adult. 



Although the puparium 

 is found in June and July, 

 the adult insect — the fly — 

 does not emerge until the 

 next April. The winter is 

 thus passed as a pupa inside 

 the dead base of the shoot. 

 There is but one brood of 

 the maggots each year. 



Natural Enemies. 

 Like most of our injuri- 

 ous insects, this raspberry- 

 cane maggot has its enemies 

 among its own kind — the 

 insects. Instead of the 

 adult insect — the Anthomy- 

 iian fly — emerging from 

 some of our puparia, a 

 little four-winged hymen- 



OpterOUS parasite appeared. 21.— infested raspberry shoots. Natural size. 



The indications are that many of the maggots fell a prey to this 

 little enemy in 1895 and 1896. It has been determined as Idiasta 

 incompleta Prov. We hope its good work may continue in our 

 raspberry fields. 



How TO Combat It. 



With a little watchfulness this new raspberry pest may be easily 

 checked. Its presence may be quickly detected in May, as its 

 work is then very conspicuous ; and this is the only month in 



