Abstract

MIRANDA CABRERA, Ileana et al. Modeling of the interaction between Meloidogyne incognita (Kofoid and Wwhite) Chitwood and Trichoderma asperellum Samuels, Lieckfeldt & Nirenberg in chikpea (Cicer arietinum L.). Rev. Protección Veg. [online]. 2016, vol.31, n.3, pp.194-200. ISSN 1010-2752.

The objective of this work was to simulate the dynamics of the interaction Meloidogyne incognita (Kofoid and White) Chitwood -Trichoderma asperellum Samuels, Lieckfeldt & Nirenberg (strain Ta-90) to demonstrate the effect of the fungus as a biological control of the nematode in chickpea (Cicer arietinum L.). The interaction was simulated by a deterministic model proposed by Anderson and May. For the calculation of the biological parameters involved in the model, two treatments were included under semi-controlled conditions, treatment 1: control chickpea plants with 0.9 nematode infective juveniles (J₂) per soil gram, treatment 2: chickpea plants with nematodes + 50 ml of T. asperellum (10⁷ UFC.ml^-1). Five plants per treatment were used in a randomized experimental design. After 35 days, the number of eggs per female, number of J₂, CFU,  colonization of ootecas, and the parasitic activity of the fungus were evaluated.  It was shown that the nematode population tended to decrease by the action of T. asperellum and reached values below the level inoculated after 73 days. Besides, it was inferred that the population decreased in a 35% from a generation to the next one, and this population decline was achieved when the level of of T. asperellum presence was higher than 10⁴ CFU.ml^-1. A second model including the crop growth dynamics was proposed to be validated in future works to demonstrate the action of the fungus at each biological stage of the nematode life-cycle

Keywords : biological control; differential equations; mathematic models; root knot nematodes.

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