1924 ENTOMOLOGICAL SOCIETY 59 



The Rose Leaf Hopper (Empoa roses). Some apple orchards, particularly 

 in the Burlington district, were again heavily infested with this species. How- 

 ever, in most parts of the Province the leaf hopper was present in smaller numbers 

 than it has been for some time past. In eastern Ontario and in the Niagara 

 peninsula, leaf hoppers parasitized by a dryinid were very commonly observed. 



Apple Plant Bugs. Apples seriously deformed by plant bugs were received 

 from several new localities. Specimens from the Fonthill district were injured 

 by Lygidea mendax, but in most cases it was impossible to determine what 

 species were responsible for the injury. 



Although the fruit in individual orchards is sometimes practically ruined 

 by plant bugs, the total yearly injury from these insects is not large in Ontario. 



Pear Psylla {Psyllia pyricola). Weather conditions must have been 

 particularly favourable for the multiplication of the psylla this year, because, 

 although the over-wintering flies were comparatively scarce in spring, the 

 insect increased at a remarkable rate, and in summer and fall, pear orchards in 

 the Niagara and Burlington districts, and as far east as Newcastle, were very 

 heavily infested. At Burlington the pears on practically all Kieffer trees which 

 did not receive a late application of nicotine, were covered with honey-dew 

 fungus, and in harvesting the crop the pickers likewise became coated with the 

 sticky, sooty material. 



Plum Curculio (Conotrachelus nenuphar). For some reason unknown to 

 us, this insect, although abundant as usual in spring, was very scarce this 

 autumn. Unsprayed apples, which ordinarily would show considerable punc- 

 turing due to the insect's feeding activities, were more or less free from this 

 injury. 



Cherry Fruit Flies (Rhagoletis cingulata and R.fausta). At Niagara-on- 

 the-Lake several orchards of Montmorency cherries were quite badly infested 

 with fruit fly maggots, but elsewhere the insects were not common. 



Plant Bugs injurious to Peaches (Lygus caryce, L. quercalbce and L. 

 omnivagus). The hickory and oak plant bugs were much more injurious to 

 peaches in the Niagara district than they were in 1922. 



In two orchards, one with hickories and the other with oaks growing near 

 by, a few damaged peaches were found as far as 200 yards from the host trees, 

 but in both cases the plant bug injury was only severe on the fruit in the immedi- 

 ate vicinity of the oaks or hickories. 



The Black Cherry Aphis {Myzus cerasi). This plant louse was very 

 abundant on sweet cherry trees throughout the Niagara peninsula. 



With reference to the control of this pest, experience has shown that, in 

 addition to spraying with nicotine sulphate, it is advisable to remove and destroy 

 aphid-infested water-sprouts in June. 



The Green Peach Aphis {Myzus persicce). In spring this species was 

 sufficiently abundant in some peach orchards near Winona to alarm the growers. 

 However, the outbreak was brought under control by natural agencies before 

 any serious damage was done. 



To anyone who has observed the myriads of returned migrants of Myzus 

 persicce which appear practically every fall in the Niagara peninsula, it is sur- 

 prising that this louse is so seldom injurious to peach trees. 



