Efficacy of fungicides for control of a difficult fungus Erysiphe cichoracearum powdery mildew on gerbera daisy Gerbera jamesonii

Robert T. McMillan, Wagner A. Vendrame

Abstract


Powdery mildew, caused by the fungus Erysiphe cichoracearum is a serious disease of Gerbera Daisy, Gerbera jamesonii. In 2005-06, five products, including conventional and a reduced risk biological fungicide, were trialed for efficacy against Erysiphe cichoracearum and Sphaerotheca fusca in a polyhouse at Kerry's Bromeliad Nursery. Six susceptible cultivars of Gerbera plants started from tissue cultured-liners were potted in 20.0 cm (8 inch) plastic pots. Natural infection was allowed to take place prior to the first application of the chemicals. Fungicides were applied on a 14 day schedule and replicated four times per treatment. Compass (trifloxystrobin) at 85 g (3 oz) per 380 L (100 gallon) of water, Heritage (azoxystrobin) at 85 g (3 oz) per 380 L (100 gallon) of water and Systhane (myclobutanil) at 142 g (5 oz) per 380 L (100 gallon) of water were significantly more effective in the control of powdery mildew than whole milk 480 ml (16 fl oz) per 380 L (100 gallon) of water.

Keywords


daisy disease; fungicide efficacy

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283