Standard method for measurement of leaf wetness duration
Among the recommendations of the Joint WMO/EPPO/NAPPO Symposium on Practical Application of Agrometeorology in Plant Protection (held in Firenze, IT, 1990-12-04/07) was that WMO should, given the importance of leaf wetness duration on the development of plant pests, formulate the specification for a standard method for the measurement of the leaf wetness duration.
Mr. R.R. Getz (US) has now prepared this for the Commission for Instruments and Methods of Observation of WMO, in the form of a 10-page 'Report on the Measurement of Leaf Wetness'. This is available from the EPPO Secretariat on request(*).
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* Please note that this document is no longer available (EPPO Secretariat, 2019-04).
Sources
World Meteorological Organization, Geneva (1992-02).