44 



THE EEPOET OF THE 



No. 36 



Approximately one-half of the crop in an apple orchard near Trenton was dam- 

 aged by the leaf-roller this year. According to the owner, this particular orchard 

 was badly infested about eight years ago, then it became nearly free from the insect. 

 The Plum Spider Mite (Paratetranychus pilosus). There was another 

 severe outbreak of the Plum Spider Mite in the Niagara district, and more plum 

 orchards were injured by it than in any other previous season. To some extent 



Plum trees injured by leaf hoppers. Note the 

 defoliation of the terminal growth. 



at least> this was undoubtedly due to the fact that, because of the very light 

 crop of plums., many orchards did not receive the regular applications of lime 

 sulphur. The life-history, habits, economic status and control of this pest are dis- 

 cussed elsewhere in this report. 



The Peae Psylla (Psyllia pyricola). This destructive pest was again very 

 abundant and injurious in pear orchards a,t Burlington and Queenston and in 

 other parts of the Niagara fruit belt. 



Oak Plant Bugs (Lygus quercalbae and L. omnivagus). In last year's 

 report we mentioned that in a peach orchard at St. Davids the fruit was quite 

 seriously injured by Lygus quercalbae. This year the same species and another 



