94 Farmers’ Bulletin 1275. 
house from 58° F. to a minimum of 70° F. and a maximum of 78° F. 
At 58° F. adult weevils were too cold to migrate, but at 70° to 78° F. 
they were very active and were spreading from heating sacks to sur- 
rounding sacks and laying eggs upon previously uninfested seeds. 
This effect of heating, due to infestation upon spread of injury 
from sack to sack, to say nothing of increase in infestation within 
the individual sacks during cold. weather, should be understood by 
those holding beans and peas, else a genuine loss will come upon them 
unawares. Fumigation with hydrocyanic-acid gas (p. 29) kills the 
insects, reduces the temperature to normal, and stops spread. Fumi- 
gation with carbon disulphid or carbon tetrachlorid will doubtless 
do the same. 
REMEDIES. 
No group of seed pests can be more easily controlled in storage 
than pea and bean weevils. Once seeds are dried and housed they 
can be protected from destruction. Owners should watch their crop 
and apply treatment at the first sign of infestation. Any remedy 
that lessens the number of weevils present in the field has a direct 
effect upon the number of weevils to be fought in storage, and vice 
versa. 
DO NOT PLANT INFESTED SEEDS. 
If seeds are planted that contain weevils, the adults emerge from 
the seed after it has been planted and live in the field until the 
pods are sufficiently developed to receive the weevil eggs. They add 
their numbers to those in the field that have migrated from the place 
of seed storage. To plant peas, beans, and cowpeas containing living 
weevils only invites a “ buggy ” crop. Since the pea and broad-bean 
weevils can not breed in dried seeds, peas intended for planting may 
be held over for one year in tight paper bags so that the weevils that 
emerge can not live but will die before the second spring. Beans and 
cowpeas affected by other weevils should be treated. 
PRACTICE CLEAN CULTURE. 
In gathering the crop leave as little of it as possible in the field. 
Seeds scattered on the ground or left in scattered pods on the dried 
vines can carry the pest over winter and furnish a supply of weevils 
the following summer to offset the trouble taken to kill the weevils 
in storage and in seeds for planting. 
HARVEST, THRASH OR SHELL, AND SACK AS SOON AS POSSIBLE. 
Because some adult weevils emerge in the late summer and fall, 
according to the latitude, leguminous crops subject to weevil attack 
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