30 THE REPOET OF TPIE - No. 36 



quite small and causing from one to ten ugly scars on each fruit where they punc- 

 tured it when feeding. So far as we could see all the damage was done by the 

 nymphs. We hope to do some work on this subject next year, as it is one of great 

 interest and no small economic importance. 



Peae Psylla (Psylla pyricola). We planned out and applied a series of ex- 

 periments this spring to test the value of lime-sulphur in the control of this tiny 

 but very destructive insect. To our surprise it almost completely disappeared from 

 some unknown cause, so that our experiments were useless. There seems to be no 

 doubt, however, that a very thorough spraying with lime-sulphur just before the 

 blossoms open will hold the insect under thorough control. Professor Parrot, of 

 Geneva, N.Y., has had excellent results from this late application of lime-sulphur. 



American Tent-Caterpillar {Malacosoma americana). In the eastern 

 counties of Ontario this insect has been rapidly increasing in numbers for the last 

 two years. This year it has done much damage in some unsprayed orchards. At 

 Guelph, too, it is becoming much more numerous than it has been for years, but 



Fig. 19. Tarnished 

 Plant Bug — much 

 enlarged. 



it is not nearly so common yet as farther east. The probabilities are that we may 

 look for a bad outbreak next year east of Kingston and a great increase in num- 

 'bers over a large part of the province. 



Peach-tree Borer (Sanninoidea exitiosa). Most of our peach orchards are 

 fairly free from this borer, but here and there during the course of the season, 

 while examining orchards for Little Peach and Yellows, I oame across one where 

 the borer was very destructive, especially to young trees. 



Tarnished Plant Bug (Lygus pratensis). Some of our nurserymen have 

 complained about an insect that kills the buds of peach trees in the nursery. Ex- 

 amination of the injury seems to indicate that the Tarnished Plant Bug is the 

 offender. There is need, however, of some further investigation on this subject. 

 Another complaint made against this insect this year was that it punctured the 

 tender growing tip of Asparagus plants. I saw these injuries near St. Oatharines 

 in August, and think the grower is probably quite correct in his claim that the 

 Tarnished Plant Bug is the offender. 



