38 



THE REPORT OF THE 



No. 36 



(A) Dwarfed plums from trees infested 1 with plum spider mites. 



(B) Normal fruit from uninfested trees. 



Life siize. 



The Mealy Plum Louse (Hyalopterus wrundinis). In early summer many 

 plum trees in the Niagara district became heavily infested with this species and 

 in several orchards spraying had to he resorted to. 



Qrape and Small Fruit Insects. 



Blackberry Leaf-miner (Metallus bethunei). This miner was again injuri- 

 ous to blackberries in the Collingwood, Oakville, Burlington and Niagara districts. 

 In a number of fields almost every leaf was badly mined. 



The great abundance of an Ichneumon parasite this fall will probably result 

 in lessened injury next year. Egg parasites were also present. 



The life historv of the miner has been worked out and a promising method 

 of control discovered. Further experiments, however, are necessary" to discover 

 whether there are any unforeseen difficulties in applying the remedy. 



Strawberry Weevil (Anthonomus sic/natus). This weevil was again in- 

 jurious in some strawberry patches in the Niagara district. 



The Red-headed Flea-beetle (Systena frontalis). This large, black flea- 

 beetle was found attacking the foliage of black currants, raspberries, apples and 

 several kinds of weeds at Mountain in September. 



The Strawberry Root-worm (Typophorus canellus). Here and there in 

 strawberry patches in the Niagara and Burlington districts, leaves- riddled by 

 this flea-beetle were very conspicuous. The flea-beetle was most abundant in old 

 patches, but even in them caused no serious damage. 



Currant Stem-gtrdler (Janus integer). The work of this saw-fly was 

 conspicuous in a number of currant patches in the Niagara district. 



Raspberry Saw-ply (Monopliadnus. rubi). The spiny, green larvse of this 

 saw-fly were present in greater or less numbers in practically all raspberry patches 

 throughout the Niagara district. 



Grate Leae-horter (TypJildcyba comes). This hopper was present in 

 injurious numbers in several Niagara vineyards. 



