1923 ENTOMOLOGICAL SOCIETY. 35 



Plum Mite (Paratetranychus pilosus). This mite was not so abundant 

 as last year. Heavy washing rains apparently did much to hold it in check. 



Pear Psylla {Psylla pyricola). There were fewer of these insects this 

 year than last and consequently control was easier. 



Rose Chafer {Macrodactylus subspinosus). These beetles were very com- 

 mon and destructive in many localities. 



San Jose Scale (Aspidiotus perniciosus). An examination of infested 

 fruit and twigs indicates that parasites of this insect are becoming more numerous. 

 This may help to explain the slow increase of this scale since the severe winter 

 of 1917-18. 



The Pear and Cherry Slug {Eriocampoides limacina). A young pear 

 orchard at Vineland was partially defoliated by this pest, but generally speaking, 

 the slug was exceedingly scarce. On account of the rarity of the male fly, it 

 is worth mentioning that one was captured at Vineland by Mr. Garlick. 



The White-Marked Tussock-moth {Hemerocampa leucostigma) . This 

 pest was present in several Niagara orchards in sufficient numbers to be noticed, 

 but in no case, which came under our observation, did it cause any serious injury. 



The Plum Curculio {Conotrachelus nenuphar). This Curculio was not 

 particularly troublesome. 



Pear Blister Mite {Eriophyes pyri). In the 1919 report we expressed 

 the opinion that this species was coming back into prominence as an orchard 

 pest, but what we looked for at that time has failed to happen. The mite is 

 still of very minor importance. 



Insects Affecting Grapes and Small Fruits 



Grape Leaf-Hoppers; Discussed elsewhere in this report. 



Rose Chafer {Macrodactylus subspinosus). Discussed elsewhere. 



Blackberry Leaf Miner {Metallus bethunei). This insect was decidedly 

 less abundant and injurious than last year. Parasites were more prevalent than 

 in 1921, but they were hardly sufficiently numerous to account for the very 

 marked decrease in the number of miners. 



Blotched mines containing larvae very similar to the blackberry leaf- 

 miner were noticed in many raspberry patches at Vineland. In no case was 

 the injury serious, but it was conspicuous enough to attract attention. Some 

 larvae were collected by Mr. Garlick of the Dominion Entomological Laboratory, 

 and adults which could not be distinguished from M. bethunei were reared. 

 These flies readily laid eggs on blackberry leaves. 



The blackberry leaf miner apparently occurs wherever blackberries are 

 grown in the province. It has been found as far north as Collingwood, and 

 this year it was fairly troublesome at Brighton. 



Gooseberry Saw-Fly {Diphadnus appendiculatus) . This rather uncommon 

 insect was found defoliating red currants and gooseberries in the Vineland dis- 

 trict. According to Mr. Garlick this insect when present does more damage 

 than the common currant worm. 



Raspberry Saw-Fly (Monophadnus rubi). This saw-fly was present in 

 many raspberry patches, but, generally speaking, did not cause much injury. 

 However, in one large patch at Vineland, the canes were almost completely 

 defoliated by it before the owner noticed the injury. 



The saw-fly is very easily controlled by spraying with arsenate of lead 

 1^2 lbs. powder, 5 lbs. hydra ted lime, 40 gallons of water. 



Raspberry Byturus {Byturus unicolor). This small pale-brown beetle 



