Plum lappet

The plum lappet (Odonestis pruni) is a moth belonging to the Lasiocampidae family within the order Lepidoptera. This insect is recognized as a foliage-feeding pest that can significantly impact the health and productivity of fruit trees, particularly in managed orchards and domestic gardens.

Its host range primarily includes members of the Rosaceae family. The larvae (caterpillars) commonly feed on the leaves of plum, cherry, apple, pear, and apricot trees. Occasionally, they can be found on various hardwood trees, but fruit orchards remain their preferred environment due to the abundance of suitable food sources.

The life cycle typically spans one generation per year. The species overwinters as young larvae tucked into crevices in the bark or near the base of the tree trunk. In spring, as temperatures rise, the caterpillars emerge to feed on developing leaves, eventually pupating in dense, silken cocoons hidden among the branches or foliage.

Damage is characterized by irregular feeding patterns on the leaves, leading to severe defoliation during outbreaks. This extensive loss of leaf surface area inhibits the tree's ability to produce energy, often resulting in stunted growth, poor fruit quality, and a general decline in the tree's overall vigor and resistance.

Integrated pest management strategies for the plum lappet include:

• Removing loose bark during winter to destroy overwintering sites.
• Manual removal of egg masses and caterpillars where populations are small.
• Applying biological insecticides containing Bacillus thuringiensis in early spring.
• Using chemical control agents specifically targeted at early larval stages.
• Monitoring the orchard regularly to identify infestations before they spread across the entire canopy.