Monitoring of Colorado beetles important in storm-affected areas


<p>Strong air currents may have carried Colorado beetles to almost anywhere in Finland, including the most important potato farming areas on the west coast and the entire region of Ostrobothnia. So far only one observation of Colorado beetles has been reported, on 2 August in Parikkala.</p>

Evira asks all professional and small-scale potato farmers to monitor their potato crops, particularly in and near storm-affected areas. The monitoring of the potato crops as part of the routine field activities is of utmost importance in the most significant potato farming areas.

Colorado beetles may have been carried to Finland in the storms and strong air currents experienced in the recent weeks from e.g. Poland, Baltic countries or Russia, where they are a common occurrence. Any beetles that have ended up in Finland will be preparing for the winter by feeding on the potato crop. It is also possible that a new generation of beetles will develop at the end of the summer and beginning of autumn. Colorado beetles spend the winter in the ground as adults; the other development stages of the beetle do not survive the winter.

Both adult beetles and larvae can be found on the potato plants. If they occur in colonies, Colorado beetles and particularly the larvae will eat the potato leaves almost completely, making them easy to detect.

Any observations or suspicions of Colorado beetles are to be reported immediately to Evira’s telephone service +358 (0) 40 801 4407 (between 9 am. and 8 pm., also during weekends).

For more information (in Finnish) about the Colorado beetle and how to identify it, please visit Evira's web site at: > Kasvintuotanto ja rehut > Kasvintarkastus > Karanteenituhoojat > Perunantuotanto > Koloradonkuoriainen

For more information, please contact:
Atro Virtanen, Senior Officer, Evira, tel. +358 (0) 2077 25047
Olli Elfving, Head of Section, Evira, tel. +358 (0) 2077 25150


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