Narrow-necked flea beetle

Taxonomic position: Psylliodes angusticollis belongs to the order Coleoptera and the family Chrysomelidae, specifically the subfamily Alticinae, commonly known as flea beetles. These insects are recognized as significant pests that specifically target plants within the Brassicaceae family.

Target crops: The pest primarily impacts agricultural crops such as oilseed rape, mustard, cabbage, and radishes. The most severe damage occurs during the seedling stage when the plants lack the vigor to withstand heavy defoliation by the beetles.

Biology and life cycle: Adults overwinter in the soil or beneath crop debris. As temperatures rise in spring, they emerge to feed on wild brassicas before migrating to commercial fields. The life cycle involves oviposition in the soil or on leaf undersides, with larvae developing through several stages before pupating.

Nature of damage and economic impact: Adult beetles create small, distinct holes or pits in leaves, a characteristic damage pattern known as "shot-holing."

• High density populations can lead to seedling death.
• Reduced leaf surface area inhibits plant development.
• Increased vulnerability to secondary infections.

Control measures: Integrated pest management strategies are crucial for mitigation. Key practices include: early planting to bypass the peak activity of the beetles, maintaining optimal soil moisture to encourage vigorous growth, and rigorous weed control. Chemical control using pyrethroid or neonicotinoid-based insecticides remains the primary approach during periods of heavy infestation.