Cherry fruit sawfly

The cherry fruit sawfly (Hoplocampa cookei) belongs to the order Hymenoptera and the family Tenthredinidae. This insect is a significant specialist pest that primarily targets stone fruit trees, causing substantial losses in both commercial orchards and home gardens.

The primary hosts for this pest include species within the Prunus genus, most notably cherries and sweet cherries. The larvae are particularly dangerous because they develop inside the young fruit, where they remain sheltered from many external environmental factors and some pesticides.

The lifecycle of the cherry fruit sawfly is highly synchronized with the flowering period of host trees. Adults emerge in early spring, precisely when the buds begin to swell. The female deposits eggs into the sepals of the blossoms, and the emerging larvae immediately burrow into the developing ovaries to feed on the embryonic seeds.

The damage caused by this pest is characterized by the premature drop of young fruitlets. As the larvae feed, they often move between fruits, causing multiple fruits on a single tree to wither and fall. Under conditions of high infestation, the pest can decimate the majority of the crop, significantly impacting economic yields.

Integrated pest management strategies to control Hoplocampa cookei include:

• Monitoring adult population levels using yellow sticky traps during the pre-bloom phase.
• Application of selective insecticides targeting the adult stage before pollination occurs.
• Cultural practices such as autumn soil cultivation to disrupt the overwintering pupal stages in the soil.
• Sanitation, including the collection and disposal of infested fruitlets that fall prematurely, to prevent larvae from entering the soil.