42 THE EEPOET OF THE No. 36 



This spray was applied two or three times a week for a period of five weeks. 



The Eose Midge (Dasyneura rhodophaga) . Discussed elsewhere. 



The Cyclamen Mite (Tarsonemus pallidus). In a St. Catharines green- 

 house, somewhere in the neighbourhood of three thousand cyclamens were so 

 badly damaged by this species that they had to be discarded. The florist estimated 

 that the mite had caused a loss of approximately $2,000.00. 



The Curled Eose Slug (Emphytus cinctipes). This fall there was a minor 

 outbreak of this slug in greenhouses at Grimsby. 



The Tarnished Plant Bug (Lygus pratensis). This notorious pest was 

 apparently not so abundant as usual; however in some districts it caused a 

 considerable amount of damage, especially to asters. Miss Olfield of Grimsby, 

 reports that hydrated lime, which we advised her to try, when dusted on asters 

 was quite effective as a repellant. 



The Greenhouse Leaf Tyer (Phlyctaenia ferrugalis). Judging by the 

 number of complaints received from florists, this pest was more injurious than 

 usual to chrysanthemums, cinerarias and other plants. 



Insects Injurious to Domestic Animals. 



The Warble Fly (Hypoderma bovis). Complaints of "gadding" of cattle 

 caused by this fly were received from Lambton, Oxford, Lincoln, Norfolk, Perth, 

 Huron and Peel counties. "Gadding" was reported as early as June 12th and 

 15th. 



Insects Injurious to Forest and Shade Trees and Shrubs. 



Birch Leaf Skeletonizer (Bucculatrix canadensisella) . In September 

 birch trees along the C.P.E. from Ottawa to Napanee looked as if their foliage 

 had been blighted, so severely had the leaves been attacked by the tiny larvae 

 of this species. 



White Oak Caterpillars. Almost every oak with the white oak type of 

 leaf along the C.P.E. from a few miles east of Napanee to a few miles west of 

 Belleville had its foliage destroyed by some caterpillar. The injury was first 

 noticed in August, and the leaves were off early in September. Oaks, like red 

 oak, with sharp pointed leaves were apparently not attacked. The writer did not 

 see the caterpillars, but received about a score of pupae collected from under- 

 neath one of the trees, and hopes to rear the adults from them next year. 



Tetranychus Bicolor. Ornamental oak trees in different parts of the 

 Niagara district were heavily infested by this mite. 



Snow-ball Aphids {Aphis viburnicola and Aphis rumicis). These insects 

 as usual were abundant and caused typical curling of the foliage and the defective 

 development of the bloom. Tests made in 1919 and 1920 demonstrated that 

 they can be controlled easily by spraying with Black-leaf-40 and soap just as 

 the buds are commencing to burst. Heavy and thorough spraying is necessary. 

 The difference between the bloom and foliage on sprayed and unsprayed bushes 

 is very striking. 



WEDNESDAY EVENING. 



In the evening a meeting, in the form of a smoker, was held in the men's 



sitting-room of the College Eesidence, at which Prof. Lochhead acted as chairman. 



Dr. E. P. Felt, State Entomologist of New York, read a paper entitled "Sortie 



of the Broader Aspects of Insect Control," in which much interest was shown 



