TABLE 1.--Comparative catches of hornworms in 3 light traps and 34 bait 
traps, Oxford, N.C., 1901 
Dake Mean number of hornworms captured per trap per da 
P. sexta P. quinquemaculata 
Bait traps 
June 1-10--------------------- TS LO oF 0 4.308 0 
11-20-------------------- 7 654 .003 5.038 2015 
21-30 esa eee eee 3 2 ° 310 ~009 .896 O41 
July 1-10--------------------- 1.600 .021 233 .012 
11-20-------------------- + 1.600 009 - 367 .012 
21-30-------------------- 4. 1.567 021 | 3.966 179 
Pe Ce = 7-000 .053 13.700 .632 
Aug. 10-18 SS SS 2.0 v6 2013 8.345 Ra leal 
Total catch-------------- : 714.000 | 43.000 | 976 .000 340.000 
Season's mean------------ = 3.306 
-016 4.519 .126 
oa 
EFFECT OF VEGETATION AND TERRAIN ON TRAP CATCH 
The low catch in bait traps was due in part to trap location, as shown by 
table 2. The catch was greatly reduced in or near woods. The moths must have 
TABLE 2.--Effect of vegetation on catch of hornworm moths in bait traps 
umber of traps Season's total number of 
Vegetation moths per trap 
Catching P. 
Woods far from open fields----- fin lily 0 O 0 
Edge of woods near open fields- 15 4 aah 40 
Edge of open fields near woods-- alik tah sel Been 
Open fields far from woods------ 22 19 lee 12.54 
either avoided the woods or they did not respond to the traps in these locations. 
The traps that caught the highest numbers were not only in open fields but also 
on or near the top of hills. There were indications that the catch increased 
when the downhill direction away from the trap led to open fields rather than to 
woods. Thus, two traps were only one-fourth mile apart and both were in the open 
near the top of hilis, but there were open fields downhill from one and woods 
downhill from the other. The first caught nine moths and the second only four. 
es 
