Population Densities of Tylenchulus semipenetrans Related to Physicochemical Properties of Soil and Yield of Clementine Mandarin in Spain

Author:

Sorribas Francisco Javier1,Verdejo-Lucas Soledad2,Pastor Joaquín3,Ornat Cesar4,Pons Joan5,Valero Jordi6

Affiliation:

1. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya, Campus Baix Llobregat, Edifici ESAB, Av. Canal Olímpic s/n, 08860 Barcelona, Spain

2. IRTA, Protecció Vegetal, Crta. De Cabrils km2, 08348, Cabrils, Barcelona, Spain

3. IRTA, Estació Experimental de l'Ebre, Apartat de Correus 203, 43870 Amposta, Tarragona, Spain

4. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya, Barcelona, Spain

5. IRTA, Estació Experimental de l'Ebre, Tarragona, Spain

6. Departament de Matemàtica Aplicada III, Universitat Politècnica de Catalunya, Barcelona, Spain

Abstract

A survey was conducted from April to June 2002 in 62 orchards of clementine mandarin grafted on Troyer or Carrizo citrange rootstock in Catalonia (northeastern Spain) to determine the relationship between physicochemical soil properties and Tylenchulus semipenetrans population densities. Soil was analyzed to determine texture, pH, electric conductivity, organic matter content, N, P, K, Mg, calcium carbonate, and calcium oxide. Also, trials were conducted in 2003 and 2004 in three drip-irrigated orchards of clementine mandarin cv. Clemenules (El Pla and Mariclaire) or cv. Hernandina (Martorella) to determine the relationship between citrus nematode densities and yield of mandarin. T. semipenetrans was detected in 77% of the surveyed orchards. The number of second-stage juveniles + males in soil was related to N and K soil content (3.57953 – 0.001305 N + 0.00113 K, R2 = 0.1620, P < 0.0157). The relationship between relative yield of clementine mandarin cv. Clemenules and densities of females per gram of root in spring was described by the Seinhorst damage function model (0.035 + 0.965 (0.9995)(Pi – 287), R2 = 0.4782, P < 0.0001).

Publisher

Scientific Societies

Subject

Plant Science,Agronomy and Crop Science

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