48 PARASITES OF THE COTTON BOLL WEEVIL. 
25. Bruchus exiguus Horn breeds in the seed pods of Amorpha 
fruticosa in the fall. It is a host of Cerambycobius cyaniceps and 
Catolaccus incertus. 
It is noticeable from the foregoing that Bracon mellitor attacks 
bud, flower, pod, and seed weevils; Catolaccus incertus attacks bud, 
pod, and seed weevils; Cerambycobius cyaniceps attacks bud, pod, 
and seed, but mainly stem weevils; Hurytoma tylodermatis attacks bud, 
flower, pod, and stem weevils; Microdontomerus anthonomi attacks bud, 
capsule, and stem weevils; Myiophasia xnea attacks bud, fruit, pod, 
nut, and stem weevils, and Sigalphus curculionis attacks bud, fruit, 
pod, and stem weevils. Such general habits indicate a generaliza- 
tion of habit in the species concerned and give promise of the 
possibility of more extensive adaptation to the boll weevil as a host. 
ROTATION OF HOSTS. 
The most important item in the solution of the parasite question 
is probably concerned with the treatment of the other hosts. It is 
found that the parasites which now attack the weevil are naturally 
parasitic on weevils of short season and few generations, and the 
most feasible proposition is that of forcing them to attack the boll 
weevil only. 
Two lines of action are suggested as possible and practicable. 
The first is, that such plants as the Crotons, hosts of Anthonomus 
albopilosus, might be planted in abundance in the pastures because 
they make good feed and are easily destroyed, and that thus the 
weevils and their parasites would increase in great numbers and the 
latter might perhaps attack the boll weevil. 
The counter proposal is that the timely elimination of the summer 
series of host plants would cut off the possibility of finding any host 
but the boll weevil, which would be in abundance. The cutting of 
the weeds around the fields could not result disadvantageously, as 
there are numerous pests harbored by these same weeds. At present 
the information as to the rotation of hosts is incomplete, and it is 
therefore necessary to go very fully into this question 4 as well as to 
test both methods which have been suggested. 
The known hosts of Bracon mellitor would insure it an uninter- 
rupted rotation if they ail occurred in a given locality. They do not, 
so there are still other unfound hosts of this species. The season of 
its hosts as far as known are as follows: 
Anthonomus fulvus breeds from May 3 to July 12. 
Desmoris scapalis breeds from July 25 to September 22 
Anthonomus squamosus breeds from August 11 to September 19. 
Anthonomus albopilosus breeds from August 26 to September 29. 
Anthonomus eugenit breeds from October 6 to October 31. 
