i62 DISEASES OF THE SWEET PEA 



FIG. 35. GREEN LACE FLY (Chrysopha oculata) an enemy 



OF THE SWEET PEA APHIS, O EGGS, b FULL GROWN 

 LARVA. C FOOT OF SAME, d LARVA DEVOURING AN 

 INSECT, e COCOON, f ADULT INSECT, g HEAD OF SAME. 

 h ADULT NATURAL SIZE. (AFTER MARLATT.) 



are then released and others caught and 

 destroyed in a similar way (fig. 35 atoh). 

 ApHiDUis. Of still greater importance in 

 the natural control of the sweet pea aphis, 

 is the parasite known as Aphiduis testa- 

 ceipes (fig. 36) . The adult female of this 

 fly possesses a long sharp pointed ovipos- 

 itor which pierces the body wall of the 



