Sweet potato flea beetle

Systematic position of this pest belongs to the order Coleoptera, family Chrysomelidae, subfamily Alticinae. These insects are well-known for their jumping ability when disturbed, which is why they are commonly referred to as flea beetles.

Crops damaged: While the name suggests a preference for sweet potatoes, Chaetocnema confinis is a significant pest of common potatoes (Solanum tuberosum). It also attacks other solanaceous crops like tomatoes and eggplants, as well as various weed species within the nightshade family.

Biology and life cycle: Adult beetles overwinter in sheltered areas, such as leaf litter or soil near the fields. They emerge in the spring to feed on foliage. The female beetle lays eggs in the soil near the host plant, and the larvae emerge to feed on the root system before pupating in the ground and emerging as adults.

Damage and economic impact: The adult beetles create characteristic small, circular "shot-holes" in the leaves, which reduces the photosynthetic area. In severe cases of infestation, the damage can lead to stunted growth, reduced tuber production, and even the total loss of young seedlings during the early stages of plant development.

Control measures: Integrated pest management (IPM) is crucial for controlling this beetle. Key strategies include practicing crop rotation to disrupt the life cycle, maintaining weed-free field margins to reduce alternative food sources, and using row covers for smaller plots. Chemical control through the application of approved insecticides should be used as a last resort based on economic threshold levels.