New knowledge of population ecology of currant borer (Synanthedon tipuliformis Clerck)
1994
Gottwald, R. (Lehr- und Versuchsanstalt fuer Integrierten Pflanzenbau, Gueterfelde (Germany)) | Kuenzel, K.
Long-standing investigations into the bionomy of the currant borer (Synanthedon tipuliformis Clerck), especially in the Havelland region (Brandenburg Land), revealed knew knowledge of its population ecology. Flight activity of the butterfly, which is active in the daytime, is decisively influenced by temperature. First butterflies fly at 14 degrees C, flight intensity increases from 19 degrees C on. Maximum values were observed at 29 degrees C. Daily rhythmicity shows a low maximum between 9.00 and 11.00 a.m. and the main maximum between 4.00 and 6.00 p.m. Increased catches in pheromone traps are found only after 3.00 p.m. The number of eggs per female averaged 50.1 eggs. Eggs are mainly deposited in the lower part of shrubs until 40 cm from stem branching. Main oviposition sites are lesions (30.6%), the base of branches (19.9%) and former infested sites (17.7%). Shrubs on the edge of a field are more strongly infested than those in the centre. Parasitization rate amounted to 25.4%. These results are used for recommendations on forecasting and monitoring of S. tipuliformis
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