SHUCK PROTECTION FOR EAR CORN. - 5 
that could be definitely attributed to them. As there was abundant 
evidence of damage due to the weevils, it was concluded that so far 
as these two classes of insects were concerned the weevils, though 
greatly outnumbered by the beetles, had undoubtedly done most 
of the actual damage to the grain. 
STORAGE INVESTIGATIONS. 
Representative ears in their shucks were taken from the plat in 
which the field investigations were made and stored in a tight 
galvanized-iron bin. In August, 1916, or about 10 months after the 
corn was first stored, the ears were classified in accordance with the 
kind of shuck covering found and then carefully examined for insect. 
infestation. 
Table IT shows the relation of the shuck covering to the percentage 
of ears infested with weevils and beetles. 
TABLE IT. —Relation of the shuck covering of corn to insect infestation oie 10 months 
in storage. 
Percentage of ears—, 
Kind of shuck covering. Infested with— 
: Not 
infested. 
Weevils. | Beetles. 
EOS VE guia ina == Seen akon ip ie ep ea nie ne Ae RCS 97 LOO S| Saas 
Goodawithawormholess-<2 2355 = =o. < tee Fak ee en ee pli Hae SIS By) 100); |peeescee 4 
CGOOCWIGROUiSWORTIN OES: ere sie an Ee eo a cee eee oe ae 77 | 23 
RO ils eee es Meee poeta Se Oe ke oot. sg Pa ee ee 66 | 95 | 5 
A total of 206 ears was examined. Of the ears in poor shucks, 97 
per cent were infested with weevils (Pl. I) and 100 per cent with 
beetles, none being free from infestation. Of the ears in good shucks 
with wormholes, 55 per cent were infested with weevils and 100 per 
cent with beetles, while none was free from infestation. Of the ears 
in good shucks without wormholes, 4 per cent were infested with 
weevils and 77 per cent with beetles, 23 per cent being free from all 
infestation (Pl. II). 
A comparison of the classes with different shuck coverings showed 
93 per cent more weevil infestation and 23 per cent more beetle 
infestation in poor shucks than in good shucks without wormholes. 
The wormholes through what was otherwise good shuck coverings 
permitted increased infestation amounting to 51 per cent for odie 
and 23 per cent for beetles. 
In this, as in the field investigations, it was found that beetles 
infested many more ears than the weevils. If they were a factor in 
damaging ear corn of adapted varieties, the shuck covering would be 
