1922 ENTOMOLOGICAL SOCIETY. 45 



plant bug L. omnivagus were found in June attacking peaches near St. Catharines. 

 Later on peaches injure'd by Lygus were observed in fourteen other orchards in 

 the section between Beamsville and St. Davids. In one planting, about 75% of 

 Elberta and St. John peaches were more or less damaged. As one would expect, 

 only orchards close to oak trees were affected. 



It is of interest to note that according to Prof. P. J. Parrott of Geneva, 

 L. quercalbae and L. caryae were taken this year feeding on peaches in New 

 York State. 



Knight* states that L. quercalbae has been found breeding only on white 

 oak (Quercus alba), and that L. omnivagus is most abundant on oaks, particularly 

 Q. alba, Q. rubra, Q. coccinea, Q. prinus and Q. velutina. Knight has also reared 

 specimens from chestnut (Castanea dentata), Cornus f lor Ida, C. circinata and 

 Virburnum acerifolium. L. caryae breeds on various kinds of hickory. 



Fruit-Tree Bark-Beetle (Eccoptogaster rugulosus). In the Niagara 

 fruit belt and in Lambton county this species was decidedly more troublesome 

 than usual on fruit trees, particularly on cherry and peach. In most of the cases 

 we investigated, wood-piles and brush-piles proved to be the source of infestation. 

 During late summer bark beetles were quite commonly found on cherry trees, 

 boring into the spurs, which bear the leaf clusters, causing in this way what some 

 growers referred to as a new "fire-blight." Similar leaf injury was observed on 

 apples and peaches. 



Orchard Aphids: Apple aphids, Aphis pomi and A. sorbi caused no ap- 

 preciable injury this year in most orchards. 



In the Fenwick district, sweet cherries were heavily infested with the black 

 cherry aphis, Myzus cerasi, but in the other fruit growing sections, this species 

 was not especially troublesome. 



Pear Blister Mite (Eriophyes pyri) . We are glad to report that this pest 

 has not increased, as we were afraid it would, to any marke'd extent. 



The Ribbed Cocoon-Maker (Bucculatrix pomifoliella) . Last winter the 

 white cocoons of this species were sufficiently abundant and conspicuous on apple 

 trees in a Simcoe orchard to seriously alarm the owner. He, of course, imagined 

 that his trees were infested with a new an ! d dangerous pest, 



Leaf Hoppers on Fruit Trees. The outbreak of rose leaf hopper, Empoa 

 rosae, referred to in our reports for 1919 and 1920, was to a very large extent 

 brought under control, no doubt by natural agencies, and this year the insect, 

 although common on apples, was of little importance. 



The apple or potato loaf-hopper, Empoasca mail, was very abundant on apple 

 and plum trees throughout the Niagara district. On apples the feeding activities 

 of the insect caused all the tender foliage on the terminal growth to become curled. 

 In the case of plums the foliage not only became curled, but a leaf -burn, similar 

 to hopper-burn on potatoes, developed, and on badly attacked trees many leaves 

 on the terminal growth fell prematurely. 



Peach Tree Borer (Sanninoidea exitiosa) . More inquiries than usual were 

 received from the Niagara district regarding the control of this borer. Observa- 

 tions made in Lambton county indicate that the borer is much more injurious 

 in that county than in other Ontario peach growing sections. 



*Bul. 391, Cornell Agr. Exp. Sta., May, 1917. 



