22 THE EEPOET OF THE No. 36 



Apple Aphids. The three species, Aphis sorb I, Apliis pomi. and Aj?Jiis 

 avence, were again abundant. Some young apple orchards were very heavily in- 

 fested with A. pomi, but in bearing orchards A. sorhi was, as usual, the chief 

 depredator. 



In connection with the summer hosts of A. sorhi it was found that the migrant 

 forms readily colonized three species of Plantago — P. lanceolata, P. major and P. 

 rugelii, and that as many as eleven generations of the aphid may develop on these 

 weeds. Both in the insectary and in the fields P. lanceolata, common rib grass, 

 appeared to be the favorite host. 



The Pear Psylla {Psylla pyricola). At the Vineland Experimental Farm 

 gratifying results in the control of this insect were obtained. In one experiment 

 infested trees were sprayed, after the cluster buds had burst, with lime sulphur 

 wash, testing 1,030 specific gravity. In a second experiment, of course with 

 different trees, lime sulphur diluted to summer strength in tobacco water (1 lb. 

 tobacco refuse in 2 gallons of water) was used and the application was made just 

 after the blossoms had fallen. The results given by these two treatments can best 

 be stated by quoting from notes made on May 22nd : " Exp. No. 1. Results good — 

 very few nymphs are present on the trees. Exp. No. 2. Eesults practically 100 

 per cent, effective — only one living nymph found. Check. Psyllas are numerous 

 on unsprayed trees." 



Lesser Peach Tree Borer {Aegeria pictipes). Early in the season many 

 complaints were received from fruit growers regarding a " worm " which bored into 

 the trunk and large branches of peach trees and produced gumming. On looking 

 into this matteo* it was found that in practically all cases the gumming was 

 primarily caused not by the " worm " but by the peach tree canker fungus. The 

 " worm," the lesser peach borer, was, however, very much in evidence in the 

 cankered areas and by its work aggravated and greatly increased the wounds. I 

 should mention here that I found the borer in all old cankers which I examined, 

 and that I took as many as six larvae from one injured area. 



The adults of the lesser peach borer commenced to emerge towards the end of 

 May and the maximum emergence appeared to take place during mid-July, judging 

 by the large number of empty pupal skins found protruding from the trees at 

 that time. 



Cherry Aphis (Myzus cerasi). Last spring there was a serious outbreak of 

 this plant louse on sweet cherries in different parts of the Niagara district. In a 

 Vineland orchard, which I had under observation, the young shoots were injured 

 so severely that by the latter part of July most of the tender foliage was dead. The 

 fruit in this same orchard was small, ripened irregularly and much of it was 

 covered with honey dew and honey dew fungus. In fact so much damage was 

 done to the fruit that most of the crop was left on the trees. 



Mr. Howard Curran, my assistant, sprayed two infested trees with whale oil 

 soap, 1 lb. to 4 gallons of water, and destroyed in the neighborhood of 99 per cent. 

 of the aphids. 



The Easpberry Byturus {Byturus unicolor). This insect is rarely trouble- 

 some in Ontario. However, during May it was present in a large raspberry planta- 

 tion near Jordan in sufficiently large numbers to give a great deal of anxiety to tlie 

 grower. The beetle destroyed many of the flower buds by eating into them. It 

 also fed on and skeletonized the tender foliage, especially the. foliage near the 

 flower buds. 



The owner of the raspberry bushes sprayed them with arsenate of lead and 



