Green elm aphid

The green elm aphid (Tinocallis platani) is a small sap-sucking insect belonging to the order Hemiptera and the family Aphididae. It is a specialized pest primarily targeting elm species (Ulmus), though it can also be found on plane trees. These aphids are widely distributed and can cause significant aesthetic and physiological damage to urban landscape trees.

The life cycle of Tinocallis platani is typical for many aphids. They overwinter in the egg stage, with eggs attached to the bark near buds or in crevices of young twigs. As spring temperatures rise, these eggs hatch into fundatrices (stem mothers), which initiate several generations of both apterous (wingless) and alate (winged) individuals that colonize new leaf growth throughout the growing season.

The primary damage is caused by the aphids feeding on the underside of leaves. This feeding depletes the tree's energy reserves, often resulting in leaf curling, chlorosis, and premature senescence. Furthermore, the aphids secrete honeydew, a sugary substance that coats the leaves and serves as a medium for the growth of sooty mold, which impairs photosynthesis and ruins the appearance of the foliage.

In high densities, the green elm aphid significantly weakens the host tree. Chronic infestation makes the trees more susceptible to secondary pests, such as bark beetles, and various opportunistic diseases. In urban environments, this decline can lead to branch dieback and, eventually, the death of the tree if left unmanaged over several years.

Effective management and control strategies include the following:

• Monitoring the canopy in early spring to detect the initial colonization by aphids.
• Application of systemic or contact insecticides when monitoring thresholds are exceeded.
• Encouraging natural biological control agents, such as lady beetles, lacewings, and hoverflies.
• Maintaining tree vigor through proper irrigation and soil nutrient management to help trees withstand infestation stress.