The larva grows and overwinters in the twig. The adult beetles are accidental invaders; that is, they wander into the house by mistake. The elm seed bug overwinters as an adult in and around structures, wood piles and in the landscape. The beetle can defoliate a tree in a week. They feed on and skeletonise the Elm leaves. By David Goldney. Life Cycle and Habits. Life Cycle of an Elm Leaf Beetle (Xanthogaleruca luteola) By David Goldney. Larvae hatch, feed, and then pupate in crevices in the tree toward the end of summer. Larvae hatch after 10-14 days and feed for about 3 … The beetles mate and lay their eggs on the Elm leaves which then start hatching after 7 days. Females lay masses of bright yellow eggs that are attached to lower leaf surfaces. In late spring, beetles emerge and move to elm trees to mate and lay eggs. However, feeding damage is much less evident on varieties such as cedar elm, lacebark elm, American elm and winged elm. Egg laying begins when elm trees begin to flower with eggs deposited on the elm flower cups. Life cycle elm leaf beetles . As elm trees come into leaf with the arrival of spring the adult beetle emerges from its winter hibernation. In this girdled area, the female beetle digs out a slightly deeper hole and places an egg inside. The Elm Leaf Beetle (Pyrrhalta luteola) is about 4-6mm long, green and brown colour with two stripes. In the spring adults will move from their overwintering habitats out into the landscape. It is also a common indoor, household nuisance in the fall, winter and spring. Life Cycle & Reproduction. In Victoria. The most damaging stage of the elm leaf beetle’s life cycle is the larval stage, which develops through three instars. The elm leaf beetle, Xanthogaleruca luteola (Muller), was accidentally introduced into the eastern United States early in the nineteenth century. Life Cycle of an Elm Leaf Beetle (Xanthogaleruca luteola) Tue, 25/04/2017 - 7:55pm — Admin. The elm leaf beetle is a common insect on elm trees in Iowa. Elm leaf beetle females can produce up to 800 eggs in her life. In Victoria. December From late November the larvae (grubs) hatch from the eggs, growing from about 1mm to 10mm. To manage Elm Beetle infestation it helps to understand a little about the Elm Leaf Beetle life cycle. A native of Europe, the elm leaf beetle was first found in Australia in 1989, along the Mornington Peninsula. Life Cycle: The yellow-green adult beetle overwinters in protected areas, including nearby buildings. In some areas of the country, two or three generations occur during the summer. The Elm Beetles spend the cooler months in sheltered places such as wood piles, house eaves, cars & under bark. A native of Europe, the elm leaf beetle was first found in Australia in 1989, along the Mornington Peninsula. It feeds on all varieties of elm trees, especially Siberian and European elms. 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