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Integrated management approaches to control Alternaria Brown Spot (ABS) on Citrus

Author Affiliations

  • 1UR 13AGR03, Department of Biological Sciences and Plant Protection, High Institute of Agronomy of Chott Mariem, 4042 Sousse, University of Sousse, Tunisia
  • 2UR 13AGR03, Department of Biological Sciences and Plant Protection, High Institute of Agronomy of Chott Mariem, 4042 Sousse, University of Sousse, Tunisia
  • 3UR 13AGR03, Department of Biological Sciences and Plant Protection, High Institute of Agronomy of Chott Mariem, 4042 Sousse, University of Sousse, Tunisia
  • 4Centre Technique des Agrumes, 8099 Zaouiet Jedidi- Beni Khalled- B.P. N 318, Tunisie
  • 5UR 13AGR03, Department of Biological Sciences and Plant Protection, High Institute of Agronomy of Chott Mariem, 4042 Sousse, University of Sousse, Tunisia

Res. J. Agriculture & Forestry Sci., Volume 9, Issue (3), Pages 5-11, July,8 (2021)


Since the excessive use of fungicides which was a non-environmentally friendly, the use of integrated management, based on agronomic practices such as pruning, spacing and minimize fungicide spray program, seem essential. Two field experiments were conducted successively at 2013/2014 and 2014/2015 in a Citrus orchard located in Beni Khalled (Cap Bon region, Tunisia) to the management of Alternaria Brown Spot. Three experimental plots (trees ordinary pruned; spaced and pruning and only treated with fungicides). All trees were treated with iprodione (March, April, June), copper sulfate (May), and mancozeb (September, October). Wider tree spacing and pruning associated with fungicide helped to reduce disease incidence on leaves and fruits. During both the spring and autumn flushes, ABS disease severity on leaves was reduced relatively for both cultivars in spring flush; the infected leaves number was reduced in wide trees spacing on Minneola plots and ordinary pruning on Fortune during autumn flush. The plot which was ordinary pruned showed an augmentation, up to 20-36%, of affected fruits and 10-13% for both cultivars with the application of tree spacing. A lower percentage (below 20%) of infected fruits recording the scale 1 and 2, was detected on trees ordinary pruned and spaced, also, on fruits, the disease severity index was lower for Minneola (10.6%) and Fortune (7.1%). The results obtained in this study demonstrated that combination of cultural practices such as pruning + spacing and fungicide spray could be an efficient integrated management of ABS in Tunisian Citrus orchards.


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