. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE HORSE-RADISH WEBWORM. 73 Their most noticeable injury is caused by checking the first growth of the pls^nts early in the spring and destroying the blossom buds. The pupse (fig. 27) are pale yellow marked with brown and are inclosed in cocoons. The cocoons (fig. 28) are placed on leaf petioles or among dead leaves and are exquisitely beautiful, silver-gray, lace- like, cigar-shaped objects. LIFE HISTORY. There are four generations each year and activity is continuous from the last days of March until well into
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE HORSE-RADISH WEBWORM. 73 Their most noticeable injury is caused by checking the first growth of the pls^nts early in the spring and destroying the blossom buds. The pupse (fig. 27) are pale yellow marked with brown and are inclosed in cocoons. The cocoons (fig. 28) are placed on leaf petioles or among dead leaves and are exquisitely beautiful, silver-gray, lace- like, cigar-shaped objects. LIFE HISTORY. There are four generations each year and activity is continuous from the last days of March until well into October. A few of the larvae of the fourth generation mature and produce moths in late September or October, but the majority live through the winter among dead leaves or in cracks in the soil and develop into moths the following April. The hibernating larvae may vary from very small to nearly mature specimens. The moths are remarkably long lived and egg-laying extends over a considerable period. The genera-. 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 resemble the original United States. Bureau of Entomology. Washington : G. P. O.
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