III. THE RASPBERRY SAW-FLY. 



Monoplmdnus (Monophadnoides Ashm.) ?*ubi Hair. 

 Order Hymbnoptera; family Tentheedinxd^;. 



V. H. Lowe. 



SUMMARY. 



During the past two years the raspberry saw-fly has done serious 

 injury in certain localities in the State. The adult insects appear 

 at about the time the leaves begin to expand. The eggs are placed 

 just beneath the under cuticle of the leaf by means of the saw-like 

 ovipositor with which the female is provided. The leaf tissue 

 above the eggs becomes lighter in color, so that a leaf in which 

 several eggs have been deposited has a spotted appearance. The 

 larvae are green in color and are covered with spine-bearing tuber- 

 cles. They feed voraciously upon the leaves and may occasion- 

 ally attack the tender bark of the new growth, the flower buds 

 and the young fruit. Pupation takes place under ground, the 

 larvae forming oblong cocoons of a few coarse strands of silk 

 together with a glue-like secretion mixed with particles of earth. 

 The larvae remain all summer and until the following spring in 

 the cocoons, slowly changing to the pupa state. There is but one 

 brood annually. 



Experiments showed that the larvae can be successfully checked 

 either by brushing them off from the bushes to the loose soil be- 

 tween the rows or by spraying with hellebore, 1 ounce to the 

 gallon of water. The latter method was found to be most prac- 

 tical especially in large fields. 



* Reprint from Bulletin No. 150. 



