Abstract
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 °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 ºC and 10.8 ºC 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 cm3 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).
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Acknowledgments
This work was funded by INIA project RTA2010-00017-C02 and FEDER support from European Union. Authors are thankful to Juan José Pertíñez and Maria Rubio for technical assistance in the field and laboratory. Manuel López-Gómez received support from INIA through a pre-doctoral grant.
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Vela, M.D., Giné, A., López-Gómez, M. et al. Thermal time requirements of root-knot nematodes on zucchini-squash and population dynamics with associated yield losses on spring and autumn cropping cycles. Eur J Plant Pathol 140, 481–490 (2014). https://doi.org/10.1007/s10658-014-0482-x
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DOI: https://doi.org/10.1007/s10658-014-0482-x