Pteronidea

Pteronidea is a genus of insects belonging to the order Hymenoptera and the family Tenthredinidae, commonly known as sawflies. These insects are recognized as significant pests in horticulture, particularly affecting soft fruit bushes and various deciduous trees.

The primary host plants for Pteronidea species include currants and gooseberries (Ribes spp.). The larvae, often referred to as false caterpillars, are highly destructive and feed aggressively on the foliage of their host plants, often occurring in large groups that can devastate a plant's health in a short timeframe.

The life cycle of Pteronidea typically involves overwintering in the soil as pupae within cocoons. Adults emerge in spring to coincide with the budding of their host plants. Females insert eggs into the leaf tissue, and upon hatching, the larvae go through several developmental stages (instars) before returning to the soil to pupate.

Damage caused by this pest is characterized by circular holes or entire sections of leaves being consumed, often leaving only the main veins. High infestations lead to complete defoliation, which severely stresses the plant, reduces fruit yield, and can cause plant death if left untreated over several seasons.

• Monitor bushes regularly during early spring for signs of larvae.
• Hand-pick larvae from smaller garden bushes.
• Use biological controls such as Bacillus thuringiensis where appropriate.
• Apply approved systemic or contact insecticides during the early larval stages if necessary.
• Maintain soil hygiene by cultivating the ground beneath shrubs in autumn and spring.