1915 ENTOMOLOGICAL SOCIETY. 23 



every apple on the check was infested with maggots. This experiment was 

 duplicated by Mr. Lawson Ciesar and me in a large orclmrd near Mountain, 

 and excellent results were obtained, about which Mr. Caesar no doubt will have 

 something to say. 



Apple Aphids. This ^spring at Yineland Station Laboratory we commenced 

 an investigation of three species of plant lice injurious to apple trees — Aphis 

 pomi, A. sorbi, A. avenon. Aphis pomi was found to be the most destructive species 

 in nurseries and young orchards, but sorhi proved to be the greatest depredator in 

 bearing orchards. The life histories of the three species were studied and the 

 important discovery was made that .4. sorhi spends the summer on the common 

 "plantain {Plantago major) and on ribgrass (P. lanceoluta). (It is very probable 

 that other species of Plantago act as summer hosts). Another interesting point 

 demonstrated was that sorhi will remain on the apple all year if overcrowding 

 of the aphids is prevented. 



As our study of remedial measures was of a preparatory nature, I shall not 

 mention this phase of the investigation except to call your attention to the 

 gratifying results obtained in the destruction of eggs by fumigation. Seven 

 young trees well stocked with healthy eggs and all taken from the same nursery 

 were used in the experiment. Three of them were fumigated with hydrocyanic 

 acid gas, 1 oz. — 100 cu. ft., 1.1.3 formula and tha^ others were used as a check. 

 None of the eggs on the fumigated trees hatched, whereas about 30 per cent, 

 hatched on the check. 



The Plum Cueculio {C onotrachelus nenuphar) was exceedingly trouble- 

 some on the Experimental Farm at Vineland. Apples, pears and stone fruits were 

 attacked. Apricots and crab apples suffered most severely from its depredations. 



The Pear Psylla {Psylla pyricoJa) was responsible for a considerable 

 amount of damage in several Queenston pear orchards and in one near Beamsville. 



The Apple Leaf-piopper (Empoasca mali) and its work — ^sickly, mottled 

 and sometimes curled foliage — were only too evident in some apple orchards in 

 the Vineland district. 



Cecropia (Samia cecropia) was quite abundant this past season. Larvae 

 taken from plum and apple trees were sent into my laboratory frequently, and 

 during June numerous adults were found fluttering against the windows of the 

 Administration Building, Experimental Farm, Vineland. 



Trumpet Leaf Miner {Tischeria malifoliella) . This autumn I have noticed 

 more work of the Trumpet Leaf Miner on apple foliage than I have seen during 

 previous years. 



Tetranychus pilosus. Some experimental work on the control of this plum 

 mite was done on a small scale at Vineland Station, and excellent results were 

 obtained from (1) flour paste (4 lbs.-40 gals.), (3)' lime sulphur (1.009 sp. gr.) 

 and flour paste (2 lbs.-40 gals.), (3) lime sulphur (1.009) and tobacco decoction 

 (1 lb.-2 gals.). The last two mixtures proved to be more reliable than the flour 

 paste. 



Cherry Fruit-fltes. T ol>served Bliagoletis cinc/ulata ait work amongst Mont- 

 morency and Engli^li Morello cherries in a Beamsville orchnrd, ami on the so-called 

 Mountain south of Vineland, I found the fruit on cherry trees growing along 

 the roadsides badly infested with maggots. 



The Grape Ft,ea-beetlf, (JTalficty chahihpn'] was present in injurious num- 

 bers in several sections of the Niagara District this spring. Numerous complaints 

 were received regarding the depredations of the adults on the buds and of the 

 larvae on the foliage of grape vines. 



