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Thermal time requirements of root-knot nematodes on zucchini-squash and population dynamics with associated yield losses on spring and autumn cropping cycles
Vela Delgado, María Dolores; Giné Blasco, Ariadna; López Gómez, Manuel; Sorribas Royo, Francisco Javier; Ornat Longarón, Cèsar; Verdejo Lucas, Soledad; Talavera Rubia, Miguel Francisco
Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia; Universitat Politècnica de Catalunya. PV - Patologia Vegetal
The present research was undertaken to evaluate the effects of soil temperature on the life cycle of root-knot nematodes (RKN) on zucchini-squash in growth chambers and to assess the relationship between Meloidogyne incognita soil population densities at planting (Pi), its multiplication rate, and crop losses of zucchini in field conditions. Thermal requirements for M. incognita and M. javanica were determined by cultivating zucchini plants in pots inoculated with 200 second stage juveniles (J2) of each Meloidogyne species at constant temperatures of 17, 21, 25, and 28 A degrees C. Number of days from nematode inoculation until appearance of egg laying females and until egg hatching were separately recorded. For life cycle completion, base temperatures (Tb) of 12 A(0)C and 10.8 A(0)C and accumulated degree-days above Tb (S) of 456 and 526, were estimated for M. incognita and M. javanica, respectively. The relationship between fruit weight and M. incognita Pi fits the Seinhorst damage function, but differed accordingly to the cropping season, spring or autumn. Tolerance limits for M. incognita on zucchini were 8.1 J2 per 250 cm(3) of soil in spring and 1.5 in autumn cropping cycles, and the minimum relative yields were 0.61 in spring and 0.69 in autumn. Zucchini-squash was a poorer host for M. incognita in spring than in autumn, since maximum multiplication rates (a) and equilibrium densities (E) were lower in spring (a = 16-96; E = 274-484) than in autumn (a = 270-2307; E = 787-1227).
Àrees temàtiques de la UPC::Enginyeria agroalimentària::Agricultura::Fitopatologia
Javanese root-knot nematode
Cucurbita pepo
Damage functions
Meloidogyne incognita
M. javanica
Tolerance
CUCUMIS-MELO L.
MELOIDOGYNE-INCOGNITA
ORIENTAL MELON
TEMPERATURE
DAMAGE
REPRODUCTION
RESISTANCE
ARENARIA
JAVANICA
DENSITY
Nematodes fitoparàsits
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
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Giné Blasco, Ariadna; López Gómez, Manuel; Vela Delgado, María Dolores; Ornat Longarón, Cèsar; Talavera Rubia, Miguel Francisco; Sorribas Royo, Francisco Javier; Verdejo Lucas, Soledad
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López Gómez, Manuel; Sorribas Royo, Francisco Javier; Talavera Rubia, Miguel Francisco; Verdejo Lucas, Soledad
 

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