Monitoring shows peaks of (potato tuber moth) PTM generations.
Studies are described to monitor potato tuber moth (PTM) [Phthorimaea operculella] populations and their relationship with potato crops and tuber damage, for the development of an integrated pest management programme. Research performed on potato crops in Matamata and Opiki, New Zealand, including the cultivars Delcora, Draga, Rua, Fianna and Agria, is presented. Data were collected using pheromone traps and crop scouting. Results showed that time of season was more important than crop age for PTM populations and the resulting infestations. The results indicate that it may be possible to predict peaks in larval infestations using pheromone traps. The greatest tuber damage and economic losses occurred during the peak of the 2nd PTM generation during February and March. Harvesting the crop as soon as possible during this period is recommended to restrict damage.