110 THE REPORT OF THE [19 



Plum Aphis at Dresden, the Pear-leaf Blister Mite at several places, the New York Plum 

 Scale at four different points, the Pistol Casebearer of the apple at Cobourg and Valentia, 

 Pear-tree Psylla at Winona, and an interesting injury to young plums while green by 

 the caterpillars of the Streaked Hair-streak butterfly reported by Mr. W. M. Orr from 

 Winona. 



Of rather greater importance and wider extent than the above were injuries by the 

 Ourrant Aphis, the Imported Gooseberry Saw-fly, the Pear Slug and the Eye-spotted Bud 

 Moth. Mr. J. Van Horn sent specimens of the Fruit Bark Beetle (Scolytus rugulosus 

 Ratz) from Chatham. This was first recorded as occurring in Canadian orchards last year. 



Greenhouse Pests. 



TJnder this head two new enemies have to be reported. Both were found in the 

 extensive houses of Mr- J. H. Dunlop in Toronto. The Black Violet Aphis {Drepanosi- 

 phum viohe Pergande), which has been referred to from time to time in United States 

 publications, was found in some abundance. As an aphis this is a beautiful species, 

 although destructive where it occurs in numbers. It has been treated of in a special 

 bulletin (Circular No. 37, Second Series) issued by the U. S. Division of Entomology, 

 where the value of fumigating with hydrocyanic acid gas in greenhouses and cold frames 

 is shown. While testifying to the effectiveness of the common remedy of fumigating 

 with tobacco, it is pointed out that it requires repeated use at short intervals, and that it 

 may even "cause serious injury to plants. In the case of violets, it has been found to be 

 only of slight value against plant lice working in the bud, and, while it may destroy the 

 so-called green aphis "when exposed, it is not effective in killing the black aphis. More- 

 over, tobacco may prove injurious to the foliage and flowers, bringing on epidemics of 

 'spot.' Tobacco is also useless against scale insects in general and mealy bugs." The 

 bulletin quoted from, is of very great value to horticulturists and others who grow plants 

 under glass, but particularly to violet-growers. Violets are an expensive crop to grow, and 

 this bulletin is the record of experiments which were specially undertaken to overcome 

 the difficulties of treating violets under glass. Full particulars are given as to the methods 

 of applying the remedy and the strength of gas to be used for various crops. The fol- 

 lowing quotation will illustrate the value of this pamphlet : 



<c Double English Violets — ' Marie Louise,' ' Lady Campbell ' and others. For 

 plant lice and general fumigation fifteen-hundredths of a gram of 98 per cent, cyanide of 

 potash for each cubic foot of space is required. The exposure, if made according to 

 directions, will not hurt the plants in any stage of growth. The gas has been used on a 

 large scale in fumigating violets for the past three years with the greatest success, only a 

 few treatments during the season being required. Leaf-eating larvse, slugs, millipedes, 

 cut-worms, etc., when exposed are killed as well as plant lice. R<ed spiders, however, 

 are not entirely eradicated by the treament. The foliage of single violets like California 

 and Princess of Wales are sometimes slightly injured by the stronger dose of gas. A 

 weaker dose (one-tenth of a gram potassium cyanide per cubic foot) should be used when 

 they are to be treated. 



" Other Plants. — Other plants on which the gas has been tried on a small scale 

 indicate that it may probably have quite a wide range of usefulness." 



The other new pest is the caterpillar of a small moth, Phlyctcenia ferrugalis, Hbn. 

 This is a very slender leaf-eating caterpillar when full grown, atout three-quarters of an 

 inch in length. It is of a semi- translucent green in colour, with a double white band on 

 each side of the dorsal vessel and two distinct black spots on the S( cond segment. The 

 head is white clouded on the cheeks with brown When at rest the caterpillar has the 

 habit of curling the head and the first two or three segments round at the side of the 

 body. These caterpillars have done a good deal of harm in Mr, Dunlop's rose houses, and 

 he complains of their working all through the season. The injury seems to be done 

 chiefly by eating the parenchyma from the lower sides of the leaves. The specimens bred 

 from Mr. Dunlop's material were kindly identified by Prof. C. H. Fernald, who also 

 referred me to the article in the Michigan Experiment Station Bulletin, No. 102, by Mr. G. C 



