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634 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 17 
sack of cowpeas in search of new material upon which to oviposit, and 
not necessarily the actual date of emergence in the sack. 
Daily examination indicated that the original 25 pairs of weevils 
showed little inclination to search for a new supply of food in which to 
breed. Only 5 specimens, 3 males and 2 females, were found on the 
walls of the cage. The last living adult was noted on July 27th. 
Adults of the first brood were noted first on August 9th, when one 
weevil was found on the walls of the cage. The peak of emergence of 
this brood occurred between August 20 and 25th. During this time 
approximately 1,600 weevils were caught about the cage. Practically 
all of these weevils remained inside of the cage because most of them 
were too large to go through the interstices of the 16 mesh screen. 
Apparently a large proportion of the females of the first brood laid eggs 
before leaving the infested bag of seeds in search for new material. 
The daily catch of weevils became smaller and smaller until only 15 
were taken on September 5th. After that date the numbers again 
began to increase indicating that a second brood was emerging. 
The flight peak of the second brood was reached between September 
18 and October 2. During this period 54,138 weevils were recorded, 
1,528 of which were caught on the outside of the cage. Eggs distributed 
on ripening pods in the garden nearby, indicated that a large number of 
weevils had escaped. 
Larson and Simmons 1 pointed out the fact that a heavy infestation of 
weevil may raise the temperature of the cowpeas within a bag 35°F. 
above the surrounding room temperature. During the period of heavy 
emergence, between September 18 to October 2, the temperature of the 
cowpeas remained near 100°F. both day and night. This high tempera¬ 
ture appeared to cause the emerging weevils to leave the bag, soon after 
emerging. This was especially noticeable during warm mornings and 
continued until the atmosphere began to cool. As night approached 
with its marked and rapid lowering of temperature all weevils about the 
cage sought the warm shelter of the bag of cowpeas. This became more 
marked as winter advanced with its warm or hot days and its cool or 
cold nights. 
The third brood of weevils appeared to reach its maximum during the 
latter part of October. The weevils of this brood were noticeably 
smaller than those of the earlier broods, consequently a larger percentage 
of them escaped through the screen wire of the cage. 
Tnsecticidal Effect of Cold Storage on Bean Weevils, Journal of Agricultural Re¬ 
search. Vol. XXVII. No. 2, January 12, 1924. 
