48 THE BEPORT OF THE No. 36 



Blackberry Leaf Miner (Metallus bethunei). This miner was abundant 

 in most of the blackberry patches in the Niagara and Burlington districts. We 

 regret to report that all our efforts to discover a satisfactory method of controlling 

 this pest have so fax met with failure. 



Vegetable Insects 



Cabbage Maggot (Phorbia brassicae) . There was about the usual amount 

 of cabbage maggot injury in the early part of the season. The very hot weather 

 in the first part of July apparently had the effect of reducing the insect to 

 insignificant numbers, because from that time to about the first of October 

 scarcely a fly could be found. 



Cabbage Worms (Pieris rapae and Autographa brassicae). The cabbage 

 worm was apparently not more injurious than it is in the average season, but the 

 cabbage looper was unusually abundant, at least in the Niagara district on 

 cabbage, cauliflower and turnips. In a turnip field at Jordan Harbor, the looper 

 practically stripped off all the leaves. 



-•,.%•» - , ',^> v 



Turnips nearly defoliated by cabbage looper. 



The Cabbage Aphis (Aphis brassicae). This plant louse was quite abun- 

 dant and injurious in the Niagara and Burlington districts. 



Onion Thrips (Thrips tabaci). The thrips was again injurious in the 

 onion growing sections of southern Ontario. 



The Corn Ear Worm (Heliothis obsoleta). There was a remarkable out- 

 break of the corn ear worm in Ontario, undoubtedly the worst outbreak of this 

 insect that has ever occurred in the province. From almost every part of the 

 province, even from Port Arthur and Northern Muskoka, the same story came that 

 practically every ear of the late corn was infested with caterpillars. In certain 

 districts, canning factories were closed down because there was not sufficient 

 uninjured corn to keep them going. At Port Dover, Simcoe and Vineland, the 

 ear worm was found on greenhouse tomatoes, boring into the fruit, and in this 

 way making it absolutely unfit for consumption. 



The Striped Cucumber Beetle (Diabrolica vittata). This species was 

 abundant and injurious in the Niagara district. 



