Gypsy Moth

Lymantria dispar, Gypsy Moth.

Lymantria dispar, Gypsy moth is one of the most destructive pests of shade, fruit, and ornamental trees throughout the northern hemisphere. It is also a major pest of hardwood forests. Synonyms of Gypsy moth is Porthetria dispar. The common names are: Asian gypsy moth (English), erdei gyapjaslepke (Hungarian), gubar (Romanian),, lagarta peluda (Spanish), limantria (Italian), lƒ¸Vstraesnonne (Danish), maimai-ga (Japanese), mniska vel’kohlava (Slovak), Schwammspinner (German), spongieuse (French).Gypsy moth is native to southern Europe, northern Africa, central and southern Asia, and Japan (Martin 2000). It also present in United States and Canada and is now present in most of northeastern N. America but its range is expanding to the south and west (Global Invasive Species Database)

Russell IPM manufactures and supplies pheromone lure, traps and complete monitoring systems for Lymantria dispar, Gypsy Moth. It is also know as onion moth. Pheromone trap data give early warning of the infestation and also exhibit the density of the insect population.


Adult females are white with black, wavy markings ; they have robust abdomens and do not fly, and their wingspan can reach 5 cm. Egg masses are light, and the eggs inside are black and pellet like. Each mass may contain 400-600 eggs. The caterpillar is hairy, and a mature larva is 50-65 mm long with a yellow and black head. Behind the head on the thorax and abdomen are five pairs of blue spots (tubercles) followed by six pairs of brick red spots. The pupal stage is dark reddish-brown and is held in place to some object by small strands of silk. Male moths are dark buff and fly readily during the day. Eggs deposited by females during July overwinter on trees, stones, and other substrates. Eggs hatch from late April through early May with most eggs hatching by mid-May. Small first instar larvae do not feed right after they hatch and can be dispersed by wind. Young larvae feed on foliage and remain on host plants night and day. In late May when about half-grown, larvae change their behaviour and usually feed in the trees at night, and move down to seek shelter in bark crevices or other protected sites during the day. Larvae reach maturity from mid-June to early July. Migrating caterpillars are often a nuisance during the last two weeks of June. Pupation takes place during late June and early July. The pupal cases may be observed attached to tree bark, stones, buildings, and other similar sites. Adults start emerging in late June with peak emergence in mid-July. This pest produces one generation a year in Pennsylvania (PennState Dept. Ent.).

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Trap application guidelines

Do not re-use the trap to monitor different insects as this may lead to mixed catches. One trap for every two hectares of large scale fields of homogenous lands.

Find out more about the Delta trap


Lures for pest monitoring


Lures can be changed every 4-6 weeks to get the most accurate results.

Lures handling

Pheromone lures are a very sensitive tool. They can be affected by exposure to elevated heat and direct sunshine. Direct touching by hand may cause cross contamination leading to mixed catches in the trap. Some contaminants such as Nicotine May have repellent effect reducing trap catch.

Lure Storage

Store in a cool dry place.

Shelf life can vary from 3-36 months depending on the storage temperature.

See Technical Data Sheet for further details.

Find out about the Qure

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