REPORT OF THE ENTOMOLOGIST AND BOTANIST 177 



SESSIONAL PAPER No. 16 



solved in water. This is placed m a half harrel aud drawn on a cart to the edge of 

 an infested field or one likely to be infested. The mixture is then scattered broadcast 

 along the edge of the crop by means of a trowel or wooden paddle. The locusts are 

 attracted to it from long distances and are killed in large numbers by eating the 

 poison. 



FIELD CROPS. 



The Clover Seed-midge (Ceciclomyia leguminicola, Lintner) has been the cause 

 of very serious loss to seed growers in all parts of Ontario where clover seed is pro- 

 duced. Probably one-half of the crop was destroyed by this insect. In some districts 

 the whole crop was completely ruined. The remedy of feeding off or mowing the first 

 crop of clover before June 20 has been found satisfactory by all who have tried it. 

 The reason of this is that the maggots of the first brood come to maturity towards the 

 end of June, and then leave the clover heads to enter the ground, where they complete 

 their changes; and if the clover is cut or fed off before that date, the immature larvte 

 are destroyed. If the clover is left standing later than June 20, the maggots will have 

 time to complete their growth and leave the clover heads. From these larvJB the second 

 brood which attacks the seed of the second crop is produced. Just about the time the 

 seed is ripe, the larvae of the second brood fall to the ground and burrow beneath the 

 surface, where they pass the winter, the flies emerging in June of the following year 

 and laying their eggs in the flower heads soon after these form. 



The Hop Aphis (Pliorodon liumuli, Schrank). — It is many years since serious com- 

 plaint has been received at the Division of excessive injury by the Hop Aphis. In the 

 extensive hop fields of British Columbia there is an occasional outbreak, but the excel- 

 lent crops of the last few years and the high price which has been secured for British 

 Columbian hops, shows that this crop has been produced to great perfection and with- 

 out serious injury from insects. In some of the plantations in the valley of the Fraser 

 it has required constant attention on the part of growers to keep the ' Bed Spider ' 

 under control; but this has been done to a reasonaljle extent. The sovereign remedy 

 for all mites, of which the so-called Bed Spider is one, is sulphur in some form, either 

 as flowers of sulphur mixed in the ordinary quassia and tobacco wash, which is pretty 

 generally used as a remedy or a preventive of Hop Aphis, or distributed as powder 

 through the plants. A new pest which has appeared in sufficient numbers this ye:ir 

 to be noticed in British Columbia is Psylliodes punctulata, Mels., a small flea-beetle 

 which was sent in by ]\Ir. H. Ilulbert, of Sardis, B.C., under the name of the Hop Flea - 

 beetle. This has been referred to briefly as a hop pest in Bulletin No. 4, old series, of 

 the United States. Division of Entomology. 



Some years ago hops were grown to a large extent in Prince Edward County, On- 

 tario ; but of late years the industry has been to some measure given up for the cul- 

 tivation of other crops. Some growers, however, have continued to grow hops, and 

 quite recently others were resuming the practice. During the summer of 1903, which, 

 as has been stated already, was particularly characterized by the abundance of many 

 kinds of plant-lice, the hop yards of Ontario have suffered from a serious visitation of 

 the old-time enemy, the Hop Aphis. Through the kindness of Mr. John D. Evans, of 

 Trenton, I have received a great deal of information concerning this outbreak, and he 

 has been good enough to visit and interview several of the growers wdio were most in- 

 terested in this subject. I have also received from Mr. W. B. Cooper, of Blwmficld. 

 Ont., who has been for many years an extensive grower of hops, a detailed account of 

 tliis outbreak. Mr. Evans writes: 



' Trenton, Nov. 23. — Mr. H. S. Miller, of Picton, whj is a large dealer in hops, 

 end who visited many of the hop yards at different times during the past season, states 

 that the total hop crop in the district this year yielded only 46 tons; last year, wifh 



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