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ISHS Acta Horticulturae 347: II International Symposium on Integrated Fruit Production

AN EXPERIMENT TO COMPARE INTEGRATED AND CONVENTIONAL SPRAY PROGRAMMES IN EIGHT APPLE CULTIVARS

Authors:   J. Grauslund, H. Lindhard, J. Vittrup Christensen
DOI:   10.17660/ActaHortic.1993.347.5
Abstract:
The aim of the experiment was to show the practical possibilities in an integrated apple production system. Scab control was performed according to electronic warning equipment using mixtures of protective and curative fungicides. Pests were monitored and treatments applied according to treatment threshholds using selective pesticides as much as possible. The experiment comprised of eight apple cultivars and comparison was made with a plot which had a conventional spray programme. Observations were made in the years 1987–92. Red spider mite was not a problem in the integrated plot, where phytoseid mites were common. Rust mite control was also better in this treatment. In some years scab control was not as good as in the conventional plot. Attempts to control tortricid larvae after blossoming with biological means (Bacillus thuringiensis) were not satisfactory. Identification of these species with pheromone traps showed that the most common were fruit tree tortrix moths (Archips podana and Hedya nubiferana) and bud moth (Spilonota ocellana), while summer fruit tortrix (Adoxophyes orana) was scarce.

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