Articles
DISTRIBUTION OF APPLE PROLIFERATION DISEASE IN ORCHARDS WITH INTEGRATED AND CONVENTIONAL PESTICIDE PROGRAMS
Article number
309_36
Pages
253 – 260
Language
Abstract
In the south of Germany (Pfalz) an increased number of trees with early red fall coloration was observed in autumn 1989, a disease symptom that may be caused by the apple proliferation agent.
In order to determine the percentage of infected trees, samples of all suspected trees in a number of orchards with integrated and conventional pesticide programs were examined with the DAPI-test.
The investigation yielded the following results:
- There was an overall incidence of apple proliferation at about 3% (range of 0 to 12%), irrespective of the insecticide program applied.
- There is no strong correlation between early red fall coloration and disease incidence.
Trees with red leaf symptom showed AP-infection from 0 to 100 %. - There is indication that infestation level depends on the variety.
Authors
G. Krczal, K. Bliefernicht
Keywords
Apple proliferation/spread/insecticide programs
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