Mordellina

The Mordellina (genus Mordellina) belongs to the tumbling flower beetle family (Mordellidae). These beetles are easily identified by their humpbacked appearance and the sharp, pointed tip of the abdomen, which they use to catapult themselves into the air when disturbed, hence their common name.

Adult beetles are typically found on flowers, feeding on pollen and nectar. While their direct impact as adults is relatively minor, the lifecycle of these insects involves a larval stage that can be destructive to plant tissues. The larvae are often xylophagous or inhabit the pith of various herbaceous plants.

The primary concern for agriculture is the larval activity within the stems and flower stalks of certain crops, including sunflowers and legumes. The larvae burrow into the plant stem, consuming internal tissues. This feeding behavior disrupts the vascular system, preventing proper nutrient and water flow to the upper parts of the plant.

Damage symptoms include premature wilting, stem brittleness, and stunted growth of the affected parts. In severe cases, the structural integrity of the stem is compromised, leading to breakage during wind or harvest. This direct damage leads to significant yield losses in field crops.

Integrated pest management strategies are essential to minimize the damage caused by Mordellina. Key tactics include:

• Eliminating host weeds in and around fields that provide food and breeding sites.
• Practicing crop rotation to disrupt the insect's life cycle.
• Implementing post-harvest tillage to destroy overwintering larvae in crop residues.
• Applying systemic insecticides only if economic threshold levels are exceeded during the peak activity period of the adult beetles.