Abstract

FLORES-CAMACHO, Rosalinda; MANZANILLA-LOPEZ, Rosa Helena; CID DEL PRADO-VERA, Ignacio  and  MARTINEZ-GARZA, Ángel. Control of Nacobbus aberrans (Thorne) Thorne and Allen with Pochonia chamydosporia (Goddard) Gams and Zare. Rev. mex. fitopatol [online]. 2007, vol.25, n.1, pp.26-34. ISSN 2007-8080.

Five mexican isolates and a brazilian one of the fungus Pochonia chlamydosporia were evaluated as biological control agents of three mexican populations of Nacobbus aberrans. Two of the nematode populations, Montecillo (Estado de Mexico) and Tecamachalco (Puebla), were evaluated on tomato (Lycopersicon esculentum), and another population from Zacatecas (Zacatecas) on bean (Phaseolus vulgaris). The experiments were carried out in a growth chamber under controlled conditions of temperature (26°C), relative humidity (80%) and photoperiod (14 h light/ 10 h dark). All fungal isolates demonstrated high percentages of parasitism on eggs masses and eggs of N. aberrans per gram of root, thus reducing the number of second-stage juveniles of the nematode available as inoculum in the soil. The number of galls per root system was significantly reduced with the Tecamachalco population of the nematode. Treatments with the brazilian isolate VC10 had the least number of galls. The most efficient mexican isolates for control of N. aberrans were SMB3 and SC1. Proliferation of the fungus on the substrate (peat moss-quartz sand 3:1, v:v) was considerably greater than previously reported by other researchers.

Keywords : Biological control; false root-knot nematode; Verticillium chlamydosporium.

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