EXERCISE 142 



Various insects are charged with destroying things and material of value to human beings. Find 

 some object or material that shows the injurious action of insects. Find out what insect caused the mis- 

 chief. Find out all you can about the life history of the insect. Make drawings of the various stages, 

 and of the injured material. Indicate the sources of your information. 



Questions. 1. During what stage of life does the insect carry on injurious activities? 



2. What is the relation of these activities to the insect's life ? 



3. At what stage in its life history is the insect most easily combated ? 



4. What methods may be used to fight this insect ? 



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