Small, thick-set moths (Fig. 105), with smaller palps than the snout
moths. Fore wings broad at the root, with straight or somewhat curved
outer margins. Hind wings as broad, or even broader, than the fore
wings. When at rest the fore wings lie in a roof-like way. They usually
possess many characteristic markings. Hind wings greyish, without
markings. Antennæ thread-like. Caterpillars hairless, or only slightly
hairy; 16-legged: many kinds live in leaves, which they roll up; others
in twigs, buds, and fruits, which they hollow out.
The =Fawn-coloured Pea Moth= (_Grapholitha nebritana_ = _G. pisana_).
_Moth_ (Fig. 105): Length ⅜ inch; span of wings about ⅖ inch. Fore wings
fawn-coloured, with metallic sheen; alternating short, white, and dark
lines on the front margin. Hind wings black, with bronze sheen and white
fringe. _Caterpillar_: ⅓ inch long; 16-legged; pale green, with brown or
black head, neck-shield, and last body segment. The thoracic legs are
black. Dark warts on each segment. _Habits_: Compare the succeeding
species.
[Illustration:
FIG. 105.—The Fawn-coloured Pea Moth (_Grapholitha nebritana_).
]
The =Crescent Pea Moth= (_Grapholitha dorsana_).
_Moth_: Somewhat larger than the preceding species. Fore wings olive
brown, with many small short white lines on the front margin. A
yellowish white crescent on the middle of the hinder margin. Hind wings
brownish. _Caterpillar_: Nearly ⅖ inch long, 16-legged, orange yellow,
with brown or black head, neck-shield, last body segment, and thoracic
feet. Covered with brownish-yellow warts. _Habits_: The moths fly about
in large numbers round the pea blossoms, always a short time after
sunset. The female lays one, two, or at most three eggs, on a very young
pod, or on an ovary. In fourteen days the caterpillar is hatched, bores
into the pod, and attacks the peas. The opening made in the margin of
the pod closes up again. The pod generally ripens early. When it opens,
the full-grown caterpillars creep out, and become pupæ in the soil,
within a web, where the pupa lives through the winter. The peas attacked
are always covered, while in the pod, with the coarse-grained excrement
of the caterpillars, and are often united two or three together by web
fibres. _Remedy_: Deep digging of the soil before the winter, or, still
better, deep hoeing as soon as the pea crop is gathered in. In this way
many of the caterpillars or pupæ hidden in the soil will be destroyed.
Family: =Tineidæ= (_Leaf-miners_).
[Illustration:
FIG. 106.—The Larch Moth (_Coleophora laricella_).
]
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