Tripoxylon figulus

Tripoxylon figulus, commonly known as a type of mud dauber or potter wasp, belongs to the family Crabronidae. Although these insects are predators that feed on small spiders, their presence in gardens often leads to structural damage to plants and timber, making them a concern for gardeners and orchard owners.

This species primarily damages the hollow stems of plants, wood, and various garden structures. The wasps utilize pre-existing cavities, such as tunnels bored by other wood-boring insects or the hollow canes of raspberries and blackberries, to construct their nests, which often results in the wilting or death of the affected plant stems.

The biology of the species involves a complex development cycle where the female paralyzes spiders as a food source for her offspring. Eggs are laid within individual cells partitioned by clay walls. The larva develops inside the nest, after which the insect pupates and overwinters either as an adult or a prepupa.

The damage is characterized by clay-plugged entrances in stems or small holes in wooden surfaces. While the wasp does not consume the foliage, its nesting activity compromises the integrity of the plant tissues, creating entry points for fungal infections and other pathogens, which significantly reduces the overall health of the plant.

Protective measures include the sanitary pruning of dead or hollow stems where wasps might nest and sealing holes in wooden garden structures. Using protective netting on susceptible plants can help limit the spread of the pest. In severe cases, targeted insecticide applications may be used if the wasp population becomes overly intrusive.