Pear gall aphid

Anuraphis catonii is a small insect pest belonging to the order Hemiptera and the family Aphididae. It is specifically recognized for causing significant damage to pear trees by inducing the formation of galls on the foliage, which impairs the health and productivity of the trees.

The host plant range of this species is limited primarily to the genus Pyrus (pear). By feeding on the phloem sap of young leaves and shoots, the aphids disrupt the plant's nutrient distribution and cause the leaf tissues to curl and develop swellings that are typical for this specific pest interaction.

The life cycle of Anuraphis catonii starts with eggs overwintering in the crevices of the bark or around the buds. As spring temperatures rise, the nymphs emerge and begin colonizing the newly opened leaves. Throughout the summer, the population grows rapidly through several generations, exploiting the fresh growth of the host tree.

The primary damage is observed as leaf deformation and discoloration. These galls often turn from green to red and eventually become necrotic or brown. Severe infestations can lead to premature leaf drop, stunted shoot growth, and reduced fruit size, which negatively impacts the overall harvest quantity and quality.

Effective management strategies require an integrated approach. Important steps include:

• Applying dormant season oil sprays to target overwintering eggs.
• Monitoring buds in early spring for signs of colonization.
• Using contact or systemic insecticides during the peak activity period of the pest.
• Encouraging natural predators such as lady beetles, hoverflies, and lacewings.
• Proper orchard hygiene, including pruning and destruction of heavily infested plant parts.