Plants as Affected by Animal Parasites. 163 
begin almost as soon as the petals (143) fall, and will need 
to be continued every cool, still morning as long as any 
beetles are found. The work must be done in the early 
morning. Any light wood frame, covered with cloth may 
be used as a substitute for the more convenient device 
shown in the figure. Where the substitute is used, the 
beetles must be looked for on the sheet and destroyed as 
found. 
315. The Prompt Destruction of Infested Fruits 
materially aids in keeping the fruit-burrowing insects in 
subjection. Hogs and sheep in the orchard are most valu- 
able assistants in this work. The apple-maggot* is more 
effectually controlled in this manner than by any other 
known method. 
316. Sucking Insects include many species. They 
feed on the juices of the plant which they infest, and do 
not directly devour its 
tissues, as do the eat- 
ing insects; but they 
slowly exhaust its 
vitality by their con- 
tinual drain upon the 
the branches of the tree, when the latter are struck reserve food. The so- 
with a light, cloth-covered mallet, which jars the ealled scale insects be- 
beetles upon the sheet-covered frame, from which : 
they roll into the box beneath. For small trees the long to this class. 
trunk slips in through the slot at the left. These are especially 
difficult to destroy, since they are dormant the greater part 
of the year, and in this condition are protected by their 
comparatively resistant scales. 
Sucking insects are not susceptible to poisonous insect- 
icides, hence we must resort to materials that clog their 
* Trypeta pomonella. 
