Fullers rose weevil

Asynonychus cervinus

Overview:

Asynonychus cervinus, commonly known as the Strawberry Sap Beetle or the Sap Beetle, is a small insect that can be a nuisance in strawberry fields and other fruit crops. This beetle primarily feeds on overripe or damaged fruit, causing aesthetic and economic damage to crops.

Detailed Appearance:

  • Adult Strawberry Sap Beetles are small, measuring about 3 to 4 mm (0.1 to 0.16 inches) in length.
  • They have an oval-shaped body with a dark brown to black coloration.
  • The elytra (wing covers) often have distinct grooves or lines.

Life Cycle:

  • The life cycle includes egg, larva, pupa, and adult stages.
  • Eggs are laid on the surface of ripe or damaged fruit.
  • Larvae feed on decaying or overripe fruit, while adults may also feed on healthy fruit.
  • Pupation occurs in the soil, and the new generation of adult beetles emerges.

Identification of Crop Infestation:

  • Presence of adult beetles on the surface of ripe or damaged fruit.
  • Feeding damage, characterized by small holes and tunnels in fruit.
  • Accumulation of frass (insect excrement) near feeding sites.

Management Strategies:

  • Harvest Timing:

    • Harvest strawberries promptly when they are fully ripe to reduce attractiveness to Sap Beetles.
    • Remove and discard overripe or damaged fruit to minimize feeding sites.

  • Cultural Controls:

    • Practice good sanitation by removing crop residues and fallen fruit.
    • Keep the area around the crop clean to reduce potential breeding sites.

  • Biological Controls:

    • Encourage natural enemies, such as predatory beetles and parasitoid wasps, to help control Sap Beetle populations.
    • Maintain a diverse and balanced ecosystem in the crop area.

  • Chemical Controls:

    • Use insecticides labeled for Sap Beetle control, especially during periods of fruit ripening.
    • Apply insecticides according to recommended rates and timing.

  • Row Covers:

    • Use row covers to physically exclude adult Sap Beetles from reaching strawberry plants.
    • Ensure covers are securely anchored to prevent beetles from finding entry points.

Implementing a combination of these management strategies is crucial for effectively controlling Strawberry Sap Beetle infestations and minimizing damage to fruit crops. Regular monitoring, proper sanitation, and timely intervention are essential components of successful pest management in strawberry fields and similar environments.