REPORT OF THE ENTOMOLOGIST AND BOTANIST 179 
SESSIONAL PAPER No. 16 | 
is preferable because better known in the trade for what students of insects call 
the Pea Weevil; a few have even insisted that the Pea Weevil is what is really 
the Pea Moth. The name Pea Weevil, as applied by entomologists, is undoubtedly 
the correct name for the short roundish hard beetle which is found among seed peas 
from which it has emerged, leaving a perfectly round hole in the hollowed out 
pea where it passed its preparatory stages. This insect is shown enlarged and 
of the natural size at figure 2. The name Pea Weevil is claimed by entomologists 
to be correct for this insect, because it belongs to a family of beetles the technical 
name of which is weevils, and, moreover, it has always been known for nearly a 
hundred years by this name. There is, however, no particular objection to the use of 
the trade name Pea Bug, notwithstanding its inaccuracy (the insect not being a bug, 
nor in any way resembling one), because there is no true bug which is a serious enemy 
of the pea, and therefore-no confusion arises from speaking of the Pea Weevil as the 
‘Pea Bug.’ The Pea Moth, shown at figure 3 in the perfect form, which, however, is 
very seldom seen, is a small slaty-gray moth, 
three-eighths of an inch in length, resembling 
somewhat in markings but not in colour the 
Codling Moth. ‘This insect is generally seen 
by pea growers when in the caterpillar state 
(figure 3: 1 and 2), when it is usually called 
‘the worm,’ and frequently does a large 
s amount of injury to the pea crop of Canada, 
chiefly, however, in districts lying east of 
the area infested by the Pea Weevil and in- 
a creasing in severity as the Atlantic sea-board 
Fig. 3.—The Pea Moth: caterpillar and moth— ig reached. The small white caterpillars 
RS a live inside the green pods, attacking the 
peas by gnawing ragged-edged cavities into them and filling up the pod around their 
cavities with a mass of excrement. As this insect is less known to pea growers and 
seed merchants than the Pea Weevil, and as the name Pea Weevil is also somewhat com- 
paratively new to them, it having only been brought prominently forward during the 
last twenty years, during which efforts have been made to counteract insect attacks, I 
think it probable that the confusion which has arisen in the minds of some who have 
not studied insects, and who have applied the name Pea Weevil to the Pea Moth, has 
been due to their having applied the unfamiliar name Pea Weevil to the unfamiliar 
insect which they knew was not their ‘ Pea Bug,’ with which they were well acquainted. 
The third insect which has drawn attention by the extent of its injuries and which 
like both of the above is frequently spoken of as ‘ the bug,’ is the Destructive Pea Aphis, 
which is a soft-bodied plant-louse about } of an inch in length and expanding about 3 
of an inch when the wings are opened. This is 
pale bluish green in colour with the legs dark- 
ened at the joints and with very long honey 
tubes at the end of the abdomen. The Destruc- 
tive Pea Aphis appeared suddenly for the first 
time in the summer of 1899, and practically 
ruined the pea crop over large areas in the 
United States and Canada. Since that time it 
has become less in numbers and during the past 
season was only reported in a few places upon 
late peas and upon sweet peas in gardens. Per- 
Fig. 4.—The Destructive Pea Aphis: winged haps the worst attack was upon Grass Peas 
viviparous female—enlarged 6 times. which were much belated this season and upon 
Hairy Vetch and field peas which had been sown for ploughing down as green manure. 
To recapitulate, the Pea Weevil or ‘Pea Bug’ (Fig. 2) is a small beetle, the grub 
of which lives inside the pea until fully developed, and the beetle emerges in autumn or 
the following spring through a perfectly round hole. 
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