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Hemlock defoliating moth

Hemlock defoliating moth

Agonopterix alstromeriana

BIOLOGY: Mature larvae are small, green caterpillars with three dark stripes running the length of the body. The caterpillars are about 10 mm (approximately 3/8 inch) long and will wriggle vigorously when probed or otherwise stimulated. Adults are small (17mm or 2/3 inch), brownish moths. Overwintering adults lay eggs on the plants in early spring. Larvae emerge in early May, feed through July, pupate and emerge as adults in late summer.

DESTRUCTIVE STAGE: Larvae (leaf feeding)

IMPACT TO HOST: Larvae attack poison hemlock by rolling leaves and feeding on foliage, flowers, and buds.

REDISTRIBUTION: Larvae can be collected in late June and early July using picking leaf rolls off of plants. A typical release is 250 adults.

  • SCIENTIFIC NAME: Agonopterix alstromeriana
  • COMMON NAME: Hemlock defoliating moth
  • TYPE OF AGENT: Insect: Beetle (Coleoptera: Curculionidae)
  • GENERATIONS PER YEAR: One
  • OVERWINTERING STAGE: Adult (in soil)

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Utah Biological Control

Amber Mendenhall

phone: 435 830 4146

email: utahsbuggirl@gmail.com

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