Colorado potato beetles detected in Savonlinna, control measures underway
Colorado potato beetles have been found in a home garden in Savonlinna, prompting immediate control efforts by authorities. The Finnish Food Authority reports that a small number of beetles, larvae, and eggs were discovered at the site, with rapid action taken to prevent the pest from establishing a permanent population in Finland (Yle; Iltalehti).
This marks the second recent detection of the beetle in Finland, following an earlier discovery in the Lahti region before Midsummer. Comprehensive control measures are currently underway in both locations (Iltalehti).
The Colorado potato beetle is classified as a harmful quarantine pest that poses a significant threat to potato crops. According to the Finnish Food Authority, the beetles are typically carried to Finland by air currents from the Baltics and Russia. The authority has urged vigilance in monitoring potato crops, both in professional cultivations and home gardens, throughout the growing season (Iltalehti).
Identification and reporting
The Finnish Food Authority has provided guidance on identifying the beetle to aid in early detection. The adult beetle is approximately one centimeter long, with a yellow back featuring ten black longitudinal stripes. Its pronotum is orange with black spots. The larvae are reddish-orange with a black head and two rows of black spots along their sides, varying in size from 1–2 millimeters to over one centimeter. The eggs are small, yellow-orange, and found in dense clusters on the undersides of leaves (Iltalehti).
Authorities have requested that any suspected sightings be reported immediately to the Finnish Food Authority, which will arrange inspections and provide further instructions. The bulletin emphasizes that independent control measures should not be taken, as they may interfere with official eradication efforts (Iltalehti).
Regional monitoring advised
The Finnish Food Authority has highlighted Southeast Finland, other parts of Eastern Finland, Uusimaa, and Southwest Finland as areas where vigilance should be particularly high. Miia Pasanen, a special expert at the authority, notes that early detection makes control significantly easier (Iltalehti).
When present in large numbers, the beetle’s larvae can cause severe damage to potato crops, potentially consuming nearly an entire harvest. Farmers and gardeners are advised to monitor for feeding damage as part of their crop management (Iltalehti).