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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
the field, as the cotyledons are dried up and gone before larvae could 
mature, and the older stages of weevils do not appear to be able to 
survive the change through which the bean goes. Adults may emerge 
from the planted bean before it has undergone much change, but the 
writer’s observations on the length of life of the adult weevil indicate 
that the weevil does not live more than 2 months in the summer. These 
observations on the length of life of the adult weevils are born out by 
those of Slingerland 7 and others. 
If weevils which were planted in the seed beans were able to survive 
the above-named hazards and get into the field alive, they would have to 
live more than two months before the crop would be in a condition in 
which it could be infested. 
OviPOSITION IN THE FlELD 
In the field the common bean weevil, Bruchus obtectus Say, lays its 
eggs in the pod after the beans are well matured, and preferably after 
they are ripe. It has never been observed to lay eggs on the leaves, 
vines or blossoms. The four-spotted cowpea weevil, B. quadrimaculatus 
Fab., lays its eggs on the pod or on the seeds after the pod has split 
open. With both of these weevils the great majority of the eggs are 
laid during the early part of their life, and the eggs laid late in the life of 
the female usually do not hatch. 8 
Does the Planting of Weevily Beans Invite a “Buggy Crop?” 
In order to determine if possible whether or not weevils coming from 
late planted beans could infest crops having been planted earlier, 
plantings of beans other than those enumerated in Table 2 were made as 
follows : 
April 11th, 2 rows of Black spotted cowpeas, two rows of Blackeyed 
cowpeas, one row each of Mexican Red, Pinto and Dutch Caseknife. 
Of these only the last-named variety was free from weevils. The others 
were badly infested with living weevils, some with B. obtectus and others 
with B. quadrimaculatus. 
On April 12th were planted one row each of the following: Lazy 
Wife, Burpee’s Stringless Green Pod, Extra Early Refugee, Refugee 
Wax, Early Mohawk, Improved Golden Wax and Brown Kentucky 
Wonder. Of these none were infested with weevils. The above rows 
were 120 feet long. 
A plot about 8 by 20 feet contained volunteer Lady Washington beans 
which were up by April 1st. The cotyledons of these had not been 
