ISHS Acta Horticulturae 177: IV International Symposium on Flower Bulbs
CONTROL OF SOIL-BORNE DISEASES, NEMATODES AND WEEDS IN ORNAMENTAL BULB CULTIVATION BY MEANS OF FLOODING |
| Authors: | A. van Zaayen, C.J. Asjes, D. Bregman, A.Th.J. Koster, P.J. Muller, G.G.M. van der Valk, I. Vos |
| Abstract:
In the summer of 1984, about 170 acres of soil were flooded for six weeks by flower bulb growers in the northern part of the province Noord-Holland. Two years earlier, flooding had been applied for the first time by a bulb grower on a small area. In the Bulb Research Centre a preliminary investigation was then started on the effect of flooding on the survival of some soil-borne fungi, pathogenic to bulbs. Early in 1984 a research group was formed; members of the group are research workers in the field of fungal and bacterial diseases of bulbs, of stem nematodes, virus-transmitting nematodes, weeds and soil hydrology, and also extension officers. Results of small-scale experiments will be compared with those of trials in the experimental garden and in practice. Some fungal diseases and weeds could be controlled completely by flooding during six weeks, for example black slime caused by Sclerotinia bulborum, grey bulb rot caused by Rhizoctonia tuliparum, and the perennial weeds way thistle (Cirsium arvense), coltsfoot (Tussilago farfara) and couch grass (Agropyron repens). Several species of nematodes, e.g. Ditylenchus dipsaci and Trichodorus sp., were markedly reduced and sclerotia of Stromatinia gladioli showed a 50% decrease in germination. Some other diseases and annual weeds were not controlled. Flooding for six weeks prevented the development of most ground keepers; for instance cormels of gladiolus, however, survived in part. | |
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