64 MISC. PUBLICATION 318, U. S. DEPT. OF AGRICULTURE 
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‘ 
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. 
The information gained from surveys with reference to the cotton 
boll weevil, for example, would be important. The early spring survey 
to be made about the time cotton is chopped would indicate the number 
of weevils emerging from hibernation. When 40 or more weevils per 
acre are present on any given field, control measures are likely to be 
necessary on that field, and arrangements for applying such measures 
should be made. 
The square-infestation survey should be made on each field when 
the cotton begins to fruit, to determine when 10 percent of the squares 
are infested. If cloudy, rainy weather, which is favorable to boll 
weevil development, prevails, dusting with calcium arsenate should 
be started. 
Possibly one of the best examples of the effectiveness of surveys 
is that made for the hessian fly. Through a survey made each sum- 
mer by entomologists, the danger of hessian fly infestation in wheat 
sown in the fall is determined, and if necessary the farmers are 
varned to observe the safe seeding dates. Club members in terri- 
tory where the hessian fly is prevalent could, by familiarizing them- 
selves with the survey, do much to assist entomologists, as well as 
tc educate farmers, regarding the value of withholding planting until 
after the safe seeding date. 
7 Surveys may be given at the October and November meetings. See calendar of activities 
for third-year work. 
