ISHS Acta Horticulturae 422: International Conference on Integrated Fruit Production
FIRST NOTE ON PLUM SAWFLIES IN EMILIA ROMAGNA (NORTHERN ITALY) |
| Authors: | F. Molinari, G. Carli, P. Pari |
| Abstract:
Research was carried out in Emilia Romagna in order to assess the economic importance of plum sawflies. The study started in 1989 and involved 67 plum orchards; 2–8 white sticky traps per orchard, model Rebell® were placed before flowering, and checked until fruit setting. In addition to the assessment of the species present, a study to define an economic threshold, based on adult catches, was performed in 1991–93. The sex-ratio of trapped adults and the level of infestation in terms of number of eggs on flowers were taken into consideration. Hoplocampa flava L. was the most widespread species in the region, and an interesting relationship between adults trapped and percentage of flowers with eggs was pointed out; no such a relationship was noticed for the other species. A tentative threshold can be 80 adults per trap per season but, as the percentage of damaged fruits depends on the number of fruits set, other observations could be necessary. Chromatotropic traps can make, however, a substantial contribution to the forecasting of hazardous situations. | |
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