Abstract

ZARATE-ESCOBEDO, Johana et al. Concentrations and application intervals of the essential oil of Tagetes lucida Cav. against Nacobbus aberrans. Rev. Mex. Cienc. Agríc [online]. 2018, vol.9, n.3, pp.589-600. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v9i3.1218.

The scarce information on the effects of the essential oil of T. lucida against nematodes and the richness of native plant populations of this species in some localities at State of Mexico are favorable conditions to derive innocuous natural inputs that make it possible to face problems of galling by N. aberrans in the production of tomato. The objective of this study was to evaluate in greenhouse conditions the application of T. lucida oil from a natural population of Ixtapan of the Sal, State of Mexico in the formation of galls by N. aberrans in tomato seedlings. The essential oil was extracted by hydrodistillation at pilot level with dry weight yield of 0.4% (mL 100 g-1) and analyzed by GC/EM identifying the following major compounds: geranyl acetate (40.8%), β-ocimene (15.1%), nerolidol (8.1%), β-cubebeno (5.1%) and caryophyllene (5.2%). Tomato seedlings in pot were inoculated with N. aberrans (10 mL kg-1 of substrate) and were dosed with oil concentrations from 0.01 to 10 mg mL-1, as preventive and control treatments, in oil application intervals. 1, 2 and 3 weeks. Inhibition of root galling was consistent in the control (TC) treatment than in the preventive one. On TC, oil concentrations of 0.35 and 1 mg mL-1 produced 63 to 80% galling inhibition, and CL50 values of 0.06 mg mL-1 were obtained for intervals 1 and 2, and 0.13 mg mL-1 for the interval 3.

Keywords : Tagetes lucida Cav.; Nacobbus aberrans; gill inhibition; oil concentration.

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