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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 424450
Title Test of fungicides against Stemphylium vesicarium on pear with or without a warning system
Author(s) Wenneker, M.; Heijne, B.
Source In: ISHS Proceedings of the IXth pear symposium, Stellenbosch, South Africa, 2-5 February 2004. - - p. 615 - 620.
Event IX International Pear Symposium, Stellenbosch, South Africa, 2004-02-02/2004-02-05
Department(s) Applied Plant Research, Fruit Research Unit
Publication type Contribution in proceedings
Publication year 2004
Abstract Stemphylium vesicarium causes brown spot of pear. The fungus especially causes severe damage in southern Europe. In recent years the disease is also found in the Netherlands and to a lesser extent in Belgium. Conference is the cultivar most commonly grown in the Netherlands. This cultivar is one of the most susceptible cultivars. A two years experiment was started to test the most promising fungicides against S.vesicarium on Conference. Some of these fungicides were tested together with a warning system in order to reduce the number of sprays. The fungicides that were tested were: thiram, tolylfluanide, difenoconazole, tebuconazole, fludioxonil and trifloxystrobin. Fungicides in a preventive schedule were sprayed weekly from end of bloom until harvest. The fungicides applied according to the warning system were sprayed after an infection moment. Symptoms on leaves and on fruit were counted. The symptoms with S. vesicarium were reduced in the case of the best fungicide by 83% on leaves and 49% on fruit in 2002. The best fungicide reduced the incidence by 100% and 89% on leaves and fruit respectively, the following year. The number of fungicide treatments was reduced by 44% in 2002 and 67% in 2003 when the fungicides were sprayed according to the warning system. In 2002, there was no significant difference in disease incidence between the treatment sprayed weekly and sprayed according to the warning system on leaves and fruit. In 2003, fruit sprayed with fungicides after an infection were significantly more infected than fruit sprayed weekly but less infected than the untreated plots. This might be due to a change in the action threshold from 1000 points in 2002 to 1500 points in 2003.
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