ISHS Acta Horticulturae 71: Symposium on Carnations
CONTROL OF COLLAR ROT OF CARNATION CAUSED BY PHYTOPHTHORA NICOTIANAE VAR. PARASITICA (°) |
| Authors: | G. Pergola, A. Garibaldi |
| Abstract:
In this paper the results of a series of trials carried out during the period 1973–1976 on Riviera Ligure on control of collar rot caused by Phytophthora nicotianae var. parasitica are reported. The best results were obtained by transplanting the rooted cuttings on a layer, 8 cm thick, of peat. Among fungicides, Dexon, Ethazol, and Prothiocarb used weekly as soil drenching at 2 g/m2 a.i., and Captafol applied once a month at the rate of 10 g/m2 gave fairly good results. Collar rot, caused by Phytophthora nicotianae var. parasitica (Dastur) Waterh., is a serious disease of carnation in the mediterranean regions (Tramier and Andreoli, 1969; Garibaldi and Rapetti, 1975). The severity of the disease in some holdings would largely justify the cost of applying fungicides or other control measures. No commercial variety has been found to be resistant to Phytophthora parasitica and collar rot is not well controlled by soil fumigation. Previous studies have been carried out with fungicides (Tramier and Antonini, 1975) in France. This report summarizes the results of several trials made during the last four years on the control of this disease in Italy. | |
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