238 EXPERIMEXTAL FARMS. 



64 VICTORIA, A. 1901 



SOME INSECTS OF SPECIAL INTEEEST EEPORTED TO THE DIVISION 



OF ENTOMOLOGY DURING 1900. 



(Detailed Treatment of which in the Present Report is Precluded by Want of Space.) 



FODDER CROPS. 



The Clover Eoot-borer (Hylastinus ohscurus, Ma.rsh.,=Hylesinus trifolii, Muel- 

 ler). — Reported at a few places in Ontario. The worst occurrences in old clover fields at 

 London, Picton and in a small patch at Ottawa. Remedies : A short rotation and 

 the ploughing down of infested fields as soon as there is a pretty good growth after 

 the hay has been cut. 



The Large Clover Weevil (Phytonomus punctatus, Fab.). — Larvae found at 

 Picton, Ont., on May 24, in large numbers, but so severely attacked by the parasitic 

 fungus Entomophthora phytonomi, Arthur, that little injury was done. 



The Greex Clover Weevil (Phytonomus nigrirostris, Fab.). — Occurring with the 

 last named at Picton and also abundant in clover fields at Ottawa. Remedy : Early 

 cutting. The larvae feed chiefly in the sheathing bases of the leaves and in the flower 

 heads. 



ROOTS AND VEGETABLES. 



Cabbage Worms (Pieris rapae, L.). — This common enemy of the market gardener 

 was particularly abundant in all parts of Canada this year. Reported as abundant 

 and destructive at Kaslo, B.C., by Mr. J. W. Cockle, who observed it first in British 

 Columbia last year. For the first time this year it appeared on Vancouver Island, and 

 did much harm to cabbages and mignonette in gardens (J.R.Anderson, R. M. Palmer 

 and G. A. Knight). In Ontario it was destructively numerous in the counties north 

 of Lake Ontario, injuring the turnip crop seriously ; also reported as one of the worst 

 pests in Nova Scotia (Harvie Gray) and parts of Quebec. 



Remedy : Dusting with Pyrethrum and lime (or some other dry diluent), and 

 spraying with arsenical poisons in turnip fields. 



Root Maggots (Anthomyia) of Cabbages, Cauliflowers, Radishes and Onions. — 

 Many experiments were tried with more or less success. On cauliflowers and cabbages 

 the best results were secured by using the Gough tar-paper discs which have been 

 reported upon previously. For the other crops, carbolized mixtures seem to be of 

 greatest promise. 



These insects are reported to have been unusually scarce at Nappan, in Nova 

 Scotia, this season, and as a consequence good cabbages and cauliflowers were grown 

 (W. S. Blair). At other points in Nova Scotia (K. Mcintosh), New Brunswick and 

 Prince Edward Island (Father Burke), they were as destructive as usual. 



Cabbage Pionea (Pionea rimosalis, Gn.). — Destructive in turnip fields in Prince 

 Edward Island (S. A. Stewart and G. F. McKinnon). 



Turnip Aphis (Aphis hrassicae, L.). — A considerable amount of harm has been 

 done by the Turnip Aphis in a few localities, but the complaints this season have been 

 far less numerous than has usually been the case. The worst attacks have been in the 

 counties of Huron and Bruce, where in some sections as much as half the crop of 

 turnips was destroyed (H. Deacon). 



Remedies : Spraying with kerosene emulsion or whale-oil soap solution, 1 pound 

 in 6 gallons of water, at the time colonies first appear in August ; also ploughing down 

 deeply the tops as soon as cut from the roots, as the eggs were found to be laid upon 

 these in large quantities at Belgrave, Ont. 



Diamond-back Moth (Plutella cruciferarum, Zell.) — Very destructive in parts of 

 Vancouver Island (G. A. Knight) and Saskatchewan (Percy B. Gregson). 



