72 THE REPORT OF THE . No. 33 



Vegetable Insects 



t 



Cutworms have been very active in all vegetable-growing sections. Apart 

 from the customary victims (cabbage, tobacco, tomato), they have destroyed 

 entire fields of onions around Quebec city (May 27-June 20). 



Onion Maggot (Phorbia ceparum). A remarkable outbreak of this pest 

 was recorded and great damages registered (June 15-30). Sodium arsenite (half- 

 ounce per gallon) gave very satisfactory results in our ten experimental fields. 



Cabbage Worm (Pieris rapes) kept steadily at work from June 20th until 

 the very end of the season, cabbages and cauliflowers suffering equally. 



Cabbage Maggot (Phorbia brassicce). Very active during the last part of 

 June. Fields treated with corrosive sublimate, even when found in bad condi- 

 tion, came back wonderfully well. An unprotected field around Three Rivers 

 suffered a total loss of 1,500 plants. Radishes were also among the chief victims. 



Potato Beetles (Leptinotarsa decemlineata) were abundant in most parts 

 of the province and were aided in their work of destruction, in many scattered 

 localities, by the blister beetle (Macrobasis unicolor). Beans were also affected 

 by the last-named pest, which is certainly on the increase in Quebec. 



Flea-beetle (Epitrix cucumeris) showed a decrease over last year and was 

 not seen so early in the fields (June 3-10). 



Cucumber Beetle (Diabrotica vittata), scarcely noticeable in 1922, did 

 important damage to cucumbers in Montreal, Three Rivers, Quebec and Ri- 

 mouski districts. (June 20-July 25.) 



Field Crop Insects 



Grasshoppers (Melanoplus atlanis and M. femur-rubrum). Last year the 

 Saint Maurice river valley had been seriously infested with swarms of grass- 

 hoppers but the control work, started in due time, gave very good results and 

 this year that district had no trouble from that source. The counties of Charle- 

 voix and Pontiac had, last summer, some sections badly affected with the plague. 

 These sections of poor sandy soil, on account of a continuous drought, had only 

 a very light crop of grain. Grasshoppers had an easy task to destroy these few 

 signs of vegetation. 



White Grubs (Lachnosterna sp.) are becoming a serious menace to old 

 pasture lands. Reports from some localities in Eastern Townships and south 

 of Montreal show that entire fields are ruined by white grubs. Around Drum- 

 mondville counts give an average of six grubs to the square foot. Once more 

 farmers should see the dangers of a "long range" rotation. 



Orchard Insects 



Apple Maggots (Rhagoletis pomonella) have spread considerably this! 

 season and caused serious damage to apples. A change in spraying operations 

 will have to be made to control this pest. 



Plum Curculio (Conotrachelus nenuphar) was, in importance, second on the 

 list in the whole province. 



