Spotted maize beetle

The spotted maize beetle (Astylus atromaculatus) belongs to the family Melyridae within the order Coleoptera. This insect is recognized as a significant agricultural pest, particularly known for its impact on grain production in various regions across the globe.

The pest targets a wide array of crops, with maize, sorghum, sunflowers, and legumes being the primary hosts. Adult beetles are particularly attracted to the reproductive parts of plants, posing a serious threat during the critical stages of flowering and grain set.

Regarding its biology, the insect undergoes a complete life cycle. The larvae are soil-dwelling, feeding primarily on organic detritus and decaying matter, while the adults are highly mobile and feed extensively on pollen, silks, and floral tissues of host crops.

The damage caused is primarily aesthetic and yield-related. By consuming corn silks, the beetles prevent proper pollination of the cob, leading to poorly filled ears and significant reductions in grain quantity and quality during the harvest season.

• Crop rotation to disrupt the habitat of soil-dwelling larvae.
• Monitoring pest populations using yellow sticky traps during silking.
• Application of systemic or contact insecticides when economic thresholds are exceeded.
• Field sanitation to reduce sources of larval food supply.

Integrated Pest Management (IPM) practices are essential to keep the populations of Astylus atromaculatus under control, emphasizing the timing of insecticide applications to align with the peak activity of adult beetles.