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Biological control of Phytophthora nicotianae and organic media standardization in citrus nurseries.

SALEM, Assem (2005) Biological control of Phytophthora nicotianae and organic media standardization in citrus nurseries. [La lutte biologique contre Phytophthora nicotianae et la standardisation des substrats biologiques dans les pépinières d’agrumes.] Thesis, IAMB Mediterranean Agronomic Institute of Bari , Organic Farming. Collection Master of Science IAMB-CIHEAM (International Centre for advanced Mediterranean agronomic studies), no. 401. . [Unpublished]

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Investigations were carried out for the biological control of Phytophthora nicotianae (citrus root rot) on two citrus rootstocks (Sour orange and Troyer citrange) transplanted in organic and conventional substrates, treated with the semi-commercial product Clonotri (Trichoderma harzianum and Clonostachys rosea) and Metalaxyl-M as a chemical control. Clonotri was more efficient than the chemical treatment increasing plant high and weight. Organic products (Chitosan, Quillaia, Equiseto and Clonotri) were evaluated for seed treatments as alternative to copper, for the control of P. nicotianae and Rhizoctonia solani during seed storage and germination. Clonotri (10, 20 ml/l), Chitosan (10 g/l) and Equiseto (20g/l) showed the best results. A standardization of the organic substrate based on Guanito fertilizer (poultry manure) was carried out on Sour orange and Troyer citrange seedlings and its use was also extended to Volkameriana lemon seedlings. The organic substrate with 1.5% (v/v) of Guanito was the best for the both rootstocks.

Summary translation

Des enquêtes ont été menées pour la lutte biologique contre Phytophthora nicotianae (agent de la pourriture racinaire des agrumes), en testant deux porte-greffes d’agrumes (bigaradier et citrange Troyer), transplantés dans des substrats biologiques et conventionnels, traités avec le produit semi-commercial Clonotri (Trichoderma harzianum et Clonostachys rosea) et le Metalaxyl-M comme témoin chimique. Le Clonotri s’est révélé plus efficace que le témoin chimique en induisant une augmentation de la hauteur et de poids des plantes. Les produits bio (Chitosan, Quillaia, Equiseto et Clonotri) ont été évalués pour les traitements des graines comme alternative au cuivre. Concernant la lutte contre P. nicotianae et Rhizoctonia solani pendant la conservation des graines et la germination, le Clonotri (10, 20 ml/l), le Chitosan (10 g/l%) et l’ Equiseto (20g/l) ont donné les meilleurs résultats. Le substrat biologique à base de Guanito (fiente de volaille) a été standardisé et utilisé avec les semis de bigaradier et citrange Troyer et successivement, aussi avec les semis de citronnier Volkameriana. Le substrat biologique à base de Guanito à 1.5% (v/v) s’est avéré être le meilleur pour les deux porte-greffes.

EPrint Type:Thesis
Thesis Type:Master thesis
Keywords:Citrus rootstock, Phytophthora nicotianae, Trichoderma harzianum, Clonostachys rosea, Chitosan, Equisetum arvense, organic fertilizer
Subjects: Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Fruit and berries
Crop husbandry > Composting and manuring
Research affiliation: Italy > IAMB Mediterranean Agronomic Institute Bari
Deposited By: Dr. Driouech, Noureddin Ph.D
ID Code:7006
Deposited On:30 Jan 2006
Last Modified:12 Apr 2010 07:32
Document Language:English
Refereed:Not peer-reviewed

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