Rough strawberry root weevil

Systematic position: Otiorhynchus rugosostriatus belongs to the order Coleoptera and the family Curculionidae (true weevils). This species is widely recognized as a significant polyphagous pest, affecting a broad range of plant species in nurseries, gardens, and commercial agricultural fields.

Affected crops: The pest is known for its wide host range, including strawberries, raspberries, and other berry bushes. It also frequently attacks ornamental plants such as rhododendrons, roses, primulas, and various woody plants, causing stress to both container-grown and field-planted vegetation.

Biology and life cycle: The insect undergoes complete metamorphosis: egg, larva, pupa, and adult. Adults are nocturnal, typically hiding in soil or under organic debris during daylight hours. Eggs are laid in the soil near the root zone, where larvae hatch and feed on roots, often remaining in the soil for several months throughout their development.

Nature of damage and impact: Adult weevils feed on leaves, creating distinct notches along the margins. However, the larval stage is far more destructive, as they consume the fine roots and damage the root system structure. This feeding leads to stunted growth, nutrient deficiency symptoms, chlorosis, and potential plant collapse, especially in young or sensitive nursery stock.

Control measures: Managing this pest requires an integrated approach. Cultural controls like deep soil cultivation help disturb larvae. Biological control using entomopathogenic nematodes (such as Heterorhabditis or Steinernema species) has proven highly effective against soil-dwelling larvae. Chemical insecticides targeting adults during their nocturnal activity may also be used in compliance with local agricultural regulations.