52 MISC. PUBLICATION 318, U. S. DEPT. OF AGRICULTURE 



4. Pinning insects. 



5. Making a spreading board. 



6. Spreading butterflies. 



7. Mounting butterflies for ornamental use. 



EXHIBITS 7 



The primary object of an exhibit is to create interest. Tt is often 

 difficult to tell an entire story with an exhibit. Quite frequently 

 when people go where exhibits are shown, they do not take time 

 to make a complete study of the whole exhibit. For these reasons, 

 exhibits must be simple and so built that they will suggest the story 

 without the use of too many legends. 



Exhibits should create enough interest to influence the observer, 

 when he sees an article or bulletin on the subject, to want to read 

 it and know more details of that particular subject. If one of the 

 purposes of the exhibit is to show insect damage to a plant or animal, 

 living specimens should be used whenever possible, and arranged 

 in their natural position and surroundings. 



In displaying control measures, the major steps in procedure may 

 be shown. For instance, in peach borer control, use three trees or 

 stumps. Around one have the ground leveled off and free of stones 

 and trash. Around another show the position of the chemical, and 

 arrange the third to show the job completed with the soil mounded 

 up around the tree. 



Whenever possible, have the life stages of the insect and the mate- 

 rial to be used in control in conspicuous places, where persons who 

 wish to examine them more closely may do so. 



SURVEYS 8 



Through surveys it is possible to locate areas of heavy insect popu- 

 lation and arrange to apply control measures before damage occurs. 

 Where certain control measures are to start with given populations 

 of the insect, surveys are very important. Entomologists make sur- 

 veys every year, but conditions do not permit them to cover every 

 farm or even every county. Reports by local people often will help 

 the entomologist to locate threatening numbers of insects that might 

 otherwise be overlooked until after damage occurs. Information on 

 the abundance of many insect pests not mentioned in this manual 

 would be valuable. How to survey for only a few insects can be ex- 

 plained here, however. 



Large quantities of grasshoppers in a given area during late sum- 

 mer and early fall might indicate that numerous eggs were being 

 laid there. County agents or entomologists could be notified to this 

 effect, and an egg-bed count could be made. These areas could be 

 watched closely the following spring, and if young "hoppers" ap- 

 peared in dangerous quantities, poisoned bait could be applied to 

 these areas. If this were done, the hoppers would be killed before 

 they spread over the fields and necessitated the placing of poison in 

 larger areas at a much greater cost. 



7 Exhibits may be given at the August and September meetings. See calendar of 

 activities for third-year work, p. 58. 



8 Surveys may be given at the October and November meetings. See calendar ot activities 

 for third-year work. 



