Читать книгу A Guide for the Study of Animals - Worrallo Whitney - Страница 46

1 Describe the size, appearance, and colors of the plant lice in your collection and their relation to the host plant.

2 Are the lice active or sluggish? (Compare with a house fly, for instance.) What proportion of them have wings? What is the usual method of locomotion?

3 Examining a single winged specimen, how many wings do you find? How do they fold? What is the character of the wings?

4 What is the food of the plant lice? How is the food obtained? (With a hand lens identify the piercing organ.) On what parts of the plants are they found? Does the plant show any indication of being harmed by the lice? If so, how?

5 Make a count of the plant lice upon a portion of a plant and estimate the whole number upon a plant. Why are plant lice a very serious pest?

6 If any plant lice have ants associated with them, study the behavior of the ants in this curious relationship. What advantages result from this relationship of ant and aphis to either or both insects?