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EXAMINATION & EXERCISES #2

Introduction to Entomology

(Contact)

[For answers please also refer to: Borror, DJ. C.A. Triplehom, and N.F. Johnson. 1989. An Introduction to the Study of Insects (6th ed.). Holt, Rinehart and Winston, Inc., Orlando, Florida, U.S.A

&

Metcalf, R. L. 1986. The ecology of pesticides and the chemical control of insects, p. 251-97. In: M. Kogan (ed.), Ecological Theory and Integrated Pest Management Practice. John Wiley & Sons, New York. 362 p.p..]

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1. Answer the following concerning the order Hemiptera:

a. Type of metamorphosis: ____________________________________________________________

b. Kind of mouthparts:_______________________________________________________________

c. Describe the forewing:______________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

d. Food habits found in the order: _______________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

e. Names of three plant feeding families (give scientific name):__________________________________

_______________________________________________________________________________

f. Location of beak (rostrum) on head: ____________________________________________________

g. What is one of the most important families in this order as far as agriculture is concerned: ___________

______________________________________________________________________________

2. Answer the following concerning the order Homoptera:

a. The location of the beak or rostrum on the head: __________________________________________
_______________________________________________________________________________

b. Name three important families by scientific names: _________________________________________

_______________________________________________________________________________

c. What are the food habits: ___________________________________________________________

_______________________________________________________________________________

d. Overall importance of this order: ______________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

e. Describe the wings of insects in this order: _______________________________________________

________________________________________________________________________________

________________________________________________________________________________

f. What is the basic reason why so many of the Homoptera are of such economic importance: ___________

________________________________________________________________________________

________________________________________________________________________________

3. Discuss the following questions briefly and to the point:

a. Damage done by Lygus Bugs.

b. Importance of Lice on Cattle.

c. Groups of insects that carry virus diseases of plants, giving their relative importance.

d. Groups of insects pollinating plants, giving their relative importance.

e. Type of injury caused by Cockroaches.

5. Fill in the following chart:

	Order	Mouthparts Type	Economic Importance	Food Habits	Control if Needed
Earwig
Bedbugs
Silverfish
Termites
Dragonflies

6. True or False: State why false answers are considered to be false:

a. Virus disease symptoms are difficult to distinguish from genetic features.

b. Most tree viruses are carried by aphids.

c. Insects are so harmful that they should be eliminated.

d. Cultural control methods should be used in preference to chemicals if practical.

e. Hemiptera are all injurious.

f. Homoptera are all injurious to plants.

g. Phthiraptera (Anoplura) are all injurious.

h. The honeybee is an efficient pollinator of alfalfa.

i. Chemical control of vectors is the best method of controlling plant viruses.

j. Orthoptera are all injurious.

7. Answer the following questions as they apply to grasshoppers:

a. What is their order?

b. How do they overwinter (e.g., in what stage)?

c. Name two chemicals used at the present time for their control.

d. Name an injurious species found in North America? _____________, in Africa ___________________.

e. Discuss in two or three sentences the worldwide importance of Schistocerca gregaria.

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Bibliography #1 Bibliography #2 Citations