Egg laying begins when elm trees begin to flower with eggs deposited on the elm flower cups. The Elm Beetles spend the cooler months in sheltered places such as wood piles, house eaves, cars & under bark. Larvae hatch after 10-14 days and feed for about 3 ⦠Life Cycle: The yellow-green adult beetle overwinters in protected areas, including nearby buildings. By David Goldney. The Elm Leaf Beetle (Pyrrhalta luteola) is about 4-6mm long, green and brown colour with two stripes. As elm trees come into leaf with the arrival of spring the adult beetle emerges from its winter hibernation. It feeds on all varieties of elm trees, especially Siberian and European elms. A native of Europe, the elm leaf beetle was first found in Australia in 1989, along the Mornington Peninsula. Elm leaf beetle females can produce up to 800 eggs in her life. Life cycle elm leaf beetles . However, feeding damage is much less evident on varieties such as cedar elm, lacebark elm, American elm and winged elm. In this girdled area, the female beetle digs out a slightly deeper hole and places an egg inside. Life Cycle and Habits. The most damaging stage of the elm leaf beetleâs life cycle is the larval stage, which develops through three instars. The egg hatches out in the wood of the twig, regardless of whether or not it has fallen to the ground. The elm leaf beetle, Xanthogaleruca luteola (Muller), was accidentally introduced into the eastern United States early in the nineteenth century. It is also a common indoor, household nuisance in the fall, winter and spring. In late spring, beetles emerge and move to elm trees to mate and lay eggs. The adult beetles are accidental invaders; that is, they wander into the house by mistake. These eggs usually appear underneath the leaves of the selected plant. Larvae hatch, feed, and then pupate in crevices in the tree toward the end of summer. Life Cycle & Reproduction. In a few days, the twig falls to the ground. In Victoria. The beetles mate and lay their eggs on the Elm leaves which then start hatching after 7 days. In some areas of the country, two or three generations occur during the summer. The larva grows and overwinters in the twig. In the spring adults will move from their overwintering habitats out into the landscape. December From late November the larvae (grubs) hatch from the eggs, growing from about 1mm to 10mm. They feed on and skeletonise the Elm leaves. To manage Elm Beetle infestation it helps to understand a little about the Elm Leaf Beetle life cycle. The elm seed bug overwinters as an adult in and around structures, wood piles and in the landscape. Life Cycle of an Elm Leaf Beetle (Xanthogaleruca luteola) Tue, 25/04/2017 - 7:55pm â Admin. Females lay masses of bright yellow eggs that are attached to lower leaf surfaces. Elm Leaf Beetle Life Cycle. The beetle can defoliate a tree in a week. 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