Rough strawberry root weevil

Systematic position: The rough strawberry root weevil belongs to the order Coleoptera and the family Curculionidae. This species is a well-known member of the Otiorhynchus genus, recognized globally as a group of destructive pests affecting various horticultural and agricultural plants.

Host plants: This pest is polyphagous, meaning it feeds on a wide range of plants. It commonly impacts berry crops such as strawberries, raspberries, and blackberries. Additionally, it causes significant damage to grapevines, various ornamental shrubs, and young fruit tree nurseries.

Biology and life cycle: Adult weevils are nocturnal, seeking shelter in soil or under leaf litter during the day. Their life cycle includes both a larval stage residing in the soil and an adult stage feeding on foliage. The larvae are particularly damaging as they develop underground, directly consuming plant roots over an extended period.

Nature of damage: Adults produce jagged, notched edges on leaves by feeding along the margins. While adult feeding can be aesthetically damaging or stress the plant, the primary concern is the larval stage. Larvae gnaw on roots and root crowns, severely restricting the plant's ability to absorb water and nutrients, often causing total plant collapse.

Control measures: Management strategies focus on both cultural and chemical interventions. Tilling the soil in autumn helps expose and kill overwintering larvae. For active adult populations, nocturnal insecticide applications are most effective. Biological control methods, such as using entomopathogenic nematodes in the soil, have also shown promise in reducing larval populations.