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Proceedings of the International Plant Propagator's Society

Vol. 50

Evaluation of Novel Fungicides and Irrigation Methods for Grey Mould Control on Calluna vulgaris

Mark P. McQuilken

pp: 137-141

Grey mould, caused by Botrytis cinerea, is a common and damaging disease affecting many ornamental plants, including Calluna vulgaris (calluna). Trials were conducted to investigate the efficacy and crop safety of novel fungicides, and the effect of different irrigation regimes on disease development on calluna unrooted cuttings and potted plants. New anilinopyrimidine and strobilurin fungicides were compared with a grower-standard treatment of iprodione as two-and three-spray programmes. Protectant spray programmes of azoxystrobin, cyprodinil, and tolylfluanid were most effective, while iprodione gave no control. Calluna cuttings were sensitive to fungicide treatment. Although rooting of cuttings was unaffected, foliar sprays of azoxystrobin, pyrimethanil, and tebuconazole reduced the size of some cultivars. Watering cuttings during propagation by sub-irrigation (sandbed) significantly reduced disease compared with overhead hand watering. On potted plants, grey mould was significantly reduced when plants were watered by sub-irrigation compared with overhead or drip line irrigation. The importance of these findings for the integrated control of grey mould on calluna is discussed.

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