26 THE EEPOET OF THE Xo. 36 



The Pear Psylla (Psijlla pyricola). The cold, wet weather of spring was 

 so fatal to the eggs and newly hatched nymphs of this species that our spraying 

 tests in a Vineland orchard were completely nullified. The check pear trees proved 

 to be as clean as the sprayed trees. 



The Imported Spider Mite (Tetranychus pilosus). This acarid was again 

 common on plums and apples. Our experiments with the mite prove that lime 

 sulphur wash (summer strength) will readily control it. 



Beneficial Orchard Insects, 



One of the most important enemies of the green and rosy aphides of the apple 

 in the Niagara district is a small reddish cecidomyiid maggot. I have observed 

 this creature at work during the past three seasons but did not have it identified 

 until this year. The species is Apliidoletes meridionalis, Felt. 



The feeding habits of this cecidomyiid are interesting. In attacking its 

 victim the maggot, as a general rule, attaches its mouth parts to a leg joint and 

 then proceeds to gorge itself on the body juices. The favorite point of attack is 

 the articulation of the femur and tibia. (In one instance a maggot was observed 

 with its mouth parts attached to the base of an antenna.) 



The ladybirds Ilippodamia convergens and CoccineUa novemnotata were ex- 

 ceptionally common. During the summer both species were found feeding freely 

 on the green apple aphis. 



Pests of Small Fruits. 



The Blackberry Leaf Miner {Metallus rubri). A large blackberry planta- 

 tion near Vineland was seriously infested by this sawfly. 



So far as I am aware no satisfactory method of combating the miner has yet 

 been discovered. 



The Easpberry Sawfly (Monophadnus ruhi). This species was again very 

 injurious. 



The Imported Currant Borer (Aegeria iipidiformis) . Complaints about 

 the work of the borer were received from Burlington. 



Shade Tree Insects. 



Black Walnut Caterpillar (Datana integerrirna) . It was no uncommon 

 sight this past season to see Black Walnut trees which had been wholly or partially 

 defoliated by this caterpillar. 



Fall Web-Wor]M {liyphantria cunca). The ugly nests of this insect were 

 unusually abundant on shade and fruit trees. In several instances all the foliage 

 on young trees was destroyed. 



Linden Insects. 



The Basswood Leaf-miner (Chalepus rubra), and an undetermined specie? 

 of lace-bug were very common on Linden in the Horticultural Experiment Station 

 wood-lot. 



Miscellaneous Pests. 



Onion Thrips (Tlirip.^ tahaci). What might have been a serious outbreak of 

 onion thrips in the Horticultural Experiment Station vegeta1)le gardens was kept 

 within Iwunds by the effective work of a predaceous flower bug, Triplileps trisU- 

 color. B. Wh. 



