ELEVENTH ANNUAL MEETING. 



87 



destroy them. We can also kill them by placing them in a 

 tight house, tent, or box and generating some poisonous gas 

 that will suffocate them. Many other destructive insects obtain 

 their food by biting the leaves and parts of the tree. Insects 

 belonging to this latter class can be readily killed by the use of 

 the arsenical poisons, but it is of no use to poison plants as a 

 remedy against sucking insects. 



If we are asked to advise treatment against a certain insect 

 it is always necessary to find out first whether it bites or sucks 

 its food in order to know how to treat it. 



Fig. 5. — The Plum Cnrculio, Conotrachelus nenuphar Hbst. ; enlarged. 



Probably very few of you have seen the adult of the common 

 apple worm, or codlin moth, Carpocapia pomoncUa. It is a 

 very pretty brown moth. This moth lays usually its eggs upon 

 the apple and sometimes upon the leaves. The eggs are very 

 minute and it is interesting to examine them when they are 

 highly magnified. The marking or sculpture of the egg is very 

 pretty. While this moth may lay its eggs upon the apple or 

 upon the leaves, it almost always enters the apple at the calyx 

 end. The full-grown larvae is what we usually find inside the 

 apple when we try to eat it. 



The illustration shows the proper condition of the young 

 fruit for spraying. Just after the blossoms fall the calyx end 

 of the apple stands upright. If we apply the poison at this 

 time we are sure to get some of it into the end of each little 

 apple, if the work is carefully done. As I said before, the little 

 insect usually enters the apple at the calyx end, and if we are 

 able to put the poison there we are sure to kill him. A little 

 later on in the season the calyx begins to close up and if we 

 spray then the poison cannot enter the calyx end so readily. 



