130 



THE REPORT OF THE 



No. 19 



withstand the dangers of winter. A useful method is to sow a strip of wheat 

 two or three weeks before the regular crop and thus provide the flies with a 

 suitable place in which to deposit their eggs ; later on this should be ploughed 

 under and the insects destroyed, thus leaving the main crop free from, injury. 





Fig. 33. Cabbage aphis : winged male, wingless female. Small figures are the natural size. 



Fig. 34. Wire-worms : beetles and grubs 



Fig. 35. White grubs ; beetles, larva and pupa. 



Fig. 36. Wheat 'joint- worm ; affected joints ; fly greatly magnified. 



The Wheat Joint-worm (Isosoma tritici, Fitch), Fig. 36, is not of com- 

 mon occurrence in Ontario. Three years ago Dr. Fletcher reported a some- 

 what severe outbreak at Millbrook and complaints were made of it in some 

 of the south-western counties. This year specimens of its work have been 



