Development and evaluation of a model for management of brown rot in organic apple orchards

Imre J. Holb, Barbara Balla, Ferenc Abonyi, Mónika Fazekas, Péter Lakatos, József M. Gáll

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Temporal development of brown rot (Monilinia fructigena) on fruits was analysed in two organic apple orchards on three apple cultivars in Eastern Hungary from 2002 to 2006. The three-parameter logistic function gave the best fit to brown rot over four non-linear growth functions in all cultivars, years and orchards. Depending on location, year and cultivar, disease increased continuously from 6 to 8 weeks before harvest up to harvest, reaching 19-37% of disease incidence. Disease variables of Yf, the final disease incidence; β, relative rate of disease progress; AUDPCS, standardized area under disease progress curve; T1.5, the time when disease incidence reaches 1.5% (day), and M, the inflection point were derived from the three-parameter logistic function. The disease variables of Yf, β, and AUDPCS were used in a computer simulation for predicting temporal brown rot development, and the disease variables of T1.5, M, and Yf were used to determine threshold values for epidemic intensity. Afterwards these were used to construct a fundamental model for developing a brown rot forecasting and management strategy (BRFMS). The fundamental model contained four parts: i) data insertion and analyses by computer simulation of pathogen submodels, ii) calculation of yield loss threshold levels based on disease incidence, iii) determination of epidemic intensity levels and iv) a decision module with suggestions for disease management practices for each epidemic intensity level. The fundamental model was supplemented with the prediction of occurrence of the first fruit rot symptoms and with the insect injury prediction related to brown rot development in order to complete a BRFMS for organic apple orchards. In a 3-year field evaluation from 2006 to 2008, season-long application of BRFMS treatments reduced the number of sprays against brown rot by 22-33% compared with the treatments of general spray schedules against brown rot.

Original languageEnglish
Pages (from-to)469-483
Number of pages15
JournalEuropean Journal of Plant Pathology
Volume129
Issue number3
DOIs
Publication statusPublished - Mar 1 2011

Keywords

  • Disease management strategy
  • Disease variables
  • Epidemiology
  • Forecasting
  • Fruit rot
  • Monilinia fructigena
  • Organic apple
  • Spray omission

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science
  • Horticulture

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