Prediction of field occurrence of the cabbage moth, Mamestra brassicae (Lepidoptera: Noctuidae): Pheromone traps and degree-day model
1996
Johansen, N.S. (Planteforsk - Norsk Inst. for Planteforskning, Plantevernet, Aas (Norway). Avd. Skadedyr)
Pheromone traps for monitoring flight of the cabbage moth, Mamestra brassicae (L.), were tested in commercial cabbage and cauliflower fields in different localities in south-eastern Norway during 1989-91. Trap catches were very low in all localities and years, and the traps could therefore not be recommended for practical monitoring. A degree-day model for prediction of occurrence of adults, eggs and small larvae in the field was developed and validated. Agreement between predicted and observed occurrence was good. An automatic voice board response system for prognosis and advice for the growers was developed and implemented. The growers get information on present status of M. brassicae in the field, prognosis for development for the nearest days, when to record eggs for assessment of the need for control, and favourable spraying time. Advice on insecticide use is also given. The system has been evaluated.
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