Articles
BOWAS: A WEATHER-BASED WARNING SYSTEM FOR THE CONTROL OF BOTRYTIS BLIGHT IN LILY
Article number
519_22
Pages
215 – 220
Language
Abstract
Fire, or Botrytis leaf blight caused by Botrytis elliptica is the most important foliar disease of ornamental lilies (Lilium sp.) in the Netherlands.
The potentially high rate of increase of an epidemic in combination with lack of curative control options, have induced risk-adverse control practices among dutch lily bulb growers.
Our aim was to develop a warning system for the control of Botrytis leaf blight in lily (BoWaS) in order to optimize the present control strategy and to reduce the amount of fungicides used in lily bulb growing.
Infection of lilies by B. elliptica was studied under different temperature and humidity conditions.
BoWaS uses data from these studies and the regional forecast of the weather variables ‘leaf wetness duration’ and ‘leaf temperature’ to predict critical periods for Botrytis infection in lily for a five day period ahead.
Critical periods and hence action thresholds depend on cultivar susceptibility.
Between 1994 and 1997 the warning system was tested in several lily cultivars grown at different locations.
Results showed that a 30–80% reduction of input of active ingredients could be achieved depending on the cultivar susceptibility and year.
In this paper we evaluate the results of the on farm trials with respect to disease severity, final yield, fungicide input and practibility for the lily grower.
In 1998 BoWas will be available for the commercial lily growers.
The potentially high rate of increase of an epidemic in combination with lack of curative control options, have induced risk-adverse control practices among dutch lily bulb growers.
Our aim was to develop a warning system for the control of Botrytis leaf blight in lily (BoWaS) in order to optimize the present control strategy and to reduce the amount of fungicides used in lily bulb growing.
Infection of lilies by B. elliptica was studied under different temperature and humidity conditions.
BoWaS uses data from these studies and the regional forecast of the weather variables ‘leaf wetness duration’ and ‘leaf temperature’ to predict critical periods for Botrytis infection in lily for a five day period ahead.
Critical periods and hence action thresholds depend on cultivar susceptibility.
Between 1994 and 1997 the warning system was tested in several lily cultivars grown at different locations.
Results showed that a 30–80% reduction of input of active ingredients could be achieved depending on the cultivar susceptibility and year.
In this paper we evaluate the results of the on farm trials with respect to disease severity, final yield, fungicide input and practibility for the lily grower.
In 1998 BoWas will be available for the commercial lily growers.
Authors
J.E. van den Ende, M.G. Pennock-Vos, C. Bastiaansen, A.T.H.J. Koster, L.J. van der Meer
Keywords
Botrytis elliptica, Botrytis gladiolorum, Botrytis tulipae, dss, epidemiology, infection
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