Scarce swallowtail

The Scarce swallowtail (Iphiclides podalirius) is a butterfly species belonging to the family Papilionidae (swallowtails). While known for its striking appearance and role as a pollinator, its larval stage (caterpillar) acts as a foliage feeder on several fruit-bearing tree species.

This pest mainly targets trees within the Rosaceae family. Primary hosts include apple, pear, plum, peach, cherry, and almond trees. In some landscapes, the larvae may also be found on hawthorn or sloe bushes located near orchards.

The life cycle typically involves one or two generations per year depending on the climate. The species overwinters as a chrysalis attached to the host tree's twigs. Adult butterflies emerge in the spring, mating and laying eggs individually on the leaves of the target trees.

The damage is primarily caused by the feeding larvae. Early-stage caterpillars create small holes in the leaf blades, while larger instars consume significant amounts of leaf tissue, often leaving only the midrib. Severe defoliation can weaken trees, particularly young saplings, and affect overall tree vigor.

• Manual removal of eggs and larvae in small-scale gardens.
• Conservation of natural predators, such as parasitic wasps and birds.
• Application of biological insecticides like Bt (Bacillus thuringiensis).
• Targeted chemical treatments only during outbreaks in commercial orchards.

Because the Scarce swallowtail is protected in several regions, management should focus on non-chemical methods wherever possible. Monitoring the orchard during the spring and summer allows growers to assess population density and intervene only when the damage threshold is exceeded.