Insect parasitism  the alder woodwasp and its enemies /  [motion picture] : 
producers: G. H. Thompson, E. R. Skinner 
 - 1 film reel (18 min.) :  sd., col. ;  16 mm. 
 - Biology series .
<br/><br/> Also issued in b&w  Contrasts the life cycle of the alder woodwasp with the life cycles of its four parasites.  Shows how the woodwasp larva is eaten & killed by enemy parasites.  Points out how each of these parasites gains access to the woodwasp tunnel. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Parasitism,