Pink spotted bollworm

Overview:

Pectinophora scutigera, commonly known as the Grape Berry Moth, is a moth species belonging to the family Tortricidae. As its name suggests, this insect is a significant pest of grapevines, causing damage to grape berries. The larvae of the Grape Berry Moth feed on grape clusters, potentially leading to reduced fruit quality and yield.

Detailed Appearance:

• Adult Moth:

  • The adult moth has a wingspan of about 10 to 12 millimeters.
  • The forewings are mottled with brown, gray, and lighter patterns.
  • The hindwings are pale gray.

• Larva (Caterpillar):

  • The larva is typically pinkish or greenish with a brown head.
  • As it matures, it may change color, becoming darker.

Life Cycle:

• The life cycle includes egg, larva, pupa, and adult stages.
• Female moths lay eggs on grape clusters.
• Larvae hatch and feed on grape berries.
• Mature larvae drop to the ground to pupate.
• The pupa overwinters in the soil.
• Adults emerge in the spring, and the cycle repeats.

Identification of Crop Infestation:

• Presence of larvae feeding on grape berries.
• Damaged berries may have entry holes and visible feeding damage.
• Webbing or silk threads may be present on the grape clusters.

Management Strategies:

• Cultural Controls:

  • Prune grapevines to improve air circulation and reduce larval hiding places.
  • Remove and destroy infested fruit clusters during the growing season.

• Biological Controls:

  • Encourage natural enemies such as parasitoid wasps and predatory beetles.
  • Conservation of natural predators helps regulate Grape Berry Moth populations.

• Pheromone Traps:

  • Use pheromone traps to monitor adult moth activity.
  • Traps provide early warning and help with timing control measures.

• Chemical Controls:

  • Apply insecticides labeled for Grape Berry Moth control when populations exceed economic thresholds.
  • Focus on the timing of insecticide applications during vulnerable stages.

• Netting:

  • Use netting or other physical barriers to protect grape clusters from egg-laying moths.
  • This can prevent adult moths from accessing grape clusters.

• Timing of Control Measures:

  • Coordinate insecticide applications with the emergence of adult moths and egg-laying activity.
  • Regular monitoring helps determine the optimal timing for control.

Effective management of the Grape Berry Moth involves an integrated approach that combines cultural, biological, and chemical control methods. Regular monitoring, early intervention, and a well-balanced strategy contribute to successful pest management in grapevines.