THE BROAD-BEAN WEEVIL. 
15 
rucluviid bug Zebus renardii Kolen. Several hymenopterous para- 
sites 1 are recorded by European writers, but have not been observed 
in this country. 
CONTROL MEASURES. 
It is obviously impossible, at least from a practical standpoint, to 
prevent infestation of the beans in the field by such methods as the 
application of poisons or deterrents. Any control- measures, there- 
fore, must be toward keeping the adults from getting into the fields, 
or, in other words, must consist of planting seed which contains no 
live weevils. 
Mr. W. B. Parker reports good success in treating infested beans 
with water heated to about 150° F. (160° and over affects germina- 
tion) for from 15 to 20 minutes. This might do for small gardens, 
but is obviously impractical for commercial plantings, 
DRY HEAT. 
A series of experiments was carried on to determine the degree 
of heat and the length of time required to kill the weevils. Pre- 
liminary experiments showed that exposing infested beans to from 
120° to 160° F. for from 5 to 40 minutes did not kill all the weevils. 
Following is the result of the final experiment. Heat was supplied 
by electricity. For each test a sack of about 2 pounds of beans 
was used in a fumigating box with a capacity of 60 cubic feet. 
Later the beans were carefully examined to find whether they con- 
tained live or dead weevils. 
Table XI. — Effect of dry lieat on the broad-bean iceevil. 
Date treated. 
Date examined. 
o F 
Time 
treated. 
"Result. 
1917. 
Nov. 15 
1918. 
Msr. 28 
160 
160 
160 
170 
170 
170 
170 
170 
170 
180 
180 
180 
180 
180 
180 
Minutes. 
30 
40 
40 
20 
20 
25 
30 
30 
40 
15 
20 
20 
30 
30 
40 
Oct. 24 
do 
Do. 
Oct. 20 
do-... 
Do. 
Nov. 15 
.....do 
Do. 
Oct. 24 
Mar. 5 
Do. 
Do 
Mar. 28 
All dead. 
Oct. 20 
do.... 
Do. 
Nov. 15 
do .. 
Oct. 20 
All dead. 
Nov. 15 
Mar. 28. . . 
Do 
Mar. 5 
Mar. 28 
Aug. 24 
Sept. 19 
do 
Do. 
Oct. 24 
Feb. 27 
All dead. 
Oct. 20 
Mar. 28. . 
Do. 
These experiments indicate that dry heat is not a satisfactory 
remedy for the broad-bean weevil, because in order to be effective 
it has to be so high that the germinating power of the beans may be 
1 Sigalphus pallipes Nees, Sigalphus thoracicus Curt., Chremylus rubiginosus Nees 
(1, P. 57). 
