Experiment 3 
Experiment 3 was a comparison of oviposition and larval 
counts in an untrapped field and in a trapped field where the 
traps were placed in concentric circles within the field. 
Design 
Seventeen traps arranged in two concentric circles of eight 
traps and one trap in the center were located in a 122-acre 
cotton field (fig. 6). The arrangement formed eight spokes with 
traps spaced at intervals of 550 feet along the spokes. In 
addition, four timed-interval traps were located on each corner 
of the field, at least 550 feet from any other trap. Each flag 
in figure 6 represents the site where oviposition counts were 
taken from 10 plants on alternate days. Forty flags arranged in 
a similar design were used to mark sites where oviposition counts 
were also made in an adjoining unlighted field on alternate days. 
e =O 
NW eo=" oF rp Cs p ha Ne 
pea P P N 
“ap p co p ae 
= g F SS 
Vi, ie \ 
WN p cs P P \ 
nwr / =e — \\NeqZ 
/ id P Ka fi So Pr id Ny 
/ 
ag Re Te eee iy al Ae Paty ts iy 
i 4 Va P R R * P \\ 
i - / » > \ ld \ 
' La 
| f P al ere rap 3 a \ ig P ‘ 
r r ; 
+ Sk oer) —_—~4 
: { r P P eve 
Pr R rp R | P > | 
\ i r ‘ P Pay, ait 
\ r \ id R R P [fee “ i 
\ ‘S oa P if i / 
SW MII \ row& nN tals wr P lsey 
ME <Si, xa / 
\ Pr P p eee a P Pp a 
ak P > Pr Pr > Se 
“ : / 
Ne > > > > * 
DS es 
Sell? Rae 
sw See cee 
@ - GARDNER TRAPS O — WEATHER STATION 
@ - TIMED-INTERVAL TRAPS P — OVIPOSITION COUNT LOCATION 
R -RELEASE AREA C - CIRCLE NUMBER 
Figure 6,.--Diagram showing concentric arrange- 
ment of traps and location of ovipositional 
check plants in a 122-acre cotton field. 
12 
