ISHS Acta Horticulturae 734: VIII International Symposium on Plum and Prune Genetics, Breeding and Pomology
PEST MANAGEMENT IN ORGANIC PLUM PRODUCTION IN NORWAY |
| Authors: | G. Jaastad, D. Rĝen, E. Bjotveit, S. Mogan |
| Keywords: | plum rust mite, European red mite, predaceous mite, plum sawfly, quassia |
| Abstract:
About 2,5% of the total plum production area in Norway was organic in 2003. Both arthropods and fungi cause damage and reduce quality in Norwegian plum production. The main insect and mite pests in organic plum production are plum rust mite (Aculus fockeui), European red mite (Panonychus ulmi), different species of aphids (Brachycaudus helichrysi, Brachycaudus cardui, Phorodon humuli) and various lepidopterous larvae. In some regions, plum sawfly (Hoplocampa minuta) and plum fruit moth (Grapholita funebrana) are serious pests. Various fungi reduce yield and quality by causing fruit decay. In this study, registrations over two years in three different organic plum orchards with five different cultivars were performed. Results show that cultivar, orchard and number of predaceous mites explain variation in population size of rust mite and Europen red mite. The population size of predaceous mites was higher in 2002 than in 2001. In 2002, plum rust mite explained most of the variation in predaceous mites. Two trials with quassia (Quassan) against plum sawfly was conducted in 2004. The results show that quassia had similar effects as pesticides used for commercial plum production. The potential for increasing organic plum production in Norway is discussed. | |
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