. Common injurious insects of Kansas. Insect pests. 98 INJURIOUS INSECTS OF KANSAS. WALNUT MOTH. (Datana angusii G. & R.; Order, Lepidoptera.) Diagnosis.—Infesting walnut and hickory; large, blackish cat- erpillars, feeding on the leaves; often large numbers, moulting., gathered in a mass or ball on the trunk or on large limbs; when feeding, remaining close together and entirely defoliating portions of the tree, often whole trees. Description and Life-history.—The adult is a light-brown moth,. with chestnut-brown head. There are several transverse, brown lines on the fore wings; the hind w
. Common injurious insects of Kansas. Insect pests. 98 INJURIOUS INSECTS OF KANSAS. WALNUT MOTH. (Datana angusii G. & R.; Order, Lepidoptera.) Diagnosis.—Infesting walnut and hickory; large, blackish cat- erpillars, feeding on the leaves; often large numbers, moulting., gathered in a mass or ball on the trunk or on large limbs; when feeding, remaining close together and entirely defoliating portions of the tree, often whole trees. Description and Life-history.—The adult is a light-brown moth,. with chestnut-brown head. There are several transverse, brown lines on the fore wings; the hind wings pale yellowish, unmarked. Expanse of wings about two inches. The insect hibernates in the pupal stage in the ground. The moths emerge in June, and lay their eggs on the under surface of ths walnut leaves. The larvse, after hatching, keep together and. Fig. 54. Yellow-necked Apple-tree Caterpillar (Datana ministra), closely allied to, and greatly resembling, the Walnut Moth [Datana angusii): a, larva: b, moth; c, eggs; d, an egg, greatly enlarged. feed voraciously. They rapidly defoliate branches, and attract attention in this way. When ready to moult, they migrate in a body to some spot on the tree trunk, or on some large limb, and remain there in a solid, wriggling mass, until the skins have been cast. Returning to the leaves, they continue feeding. When full-grown, which they become in about five weeks, the caterpil- lar is entirely black, with scattering, long, whitish, wooly hairs over the body. When younger the color is rather wine-red. The larvse descend from the tree at about the same time, and enter the ground, where they transform into naked, brown chrysalids. The moths emerge the following May or June. Remedies. - Spraying the trees with London purple (see p. 8). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resembl
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