Abstract

ULACIO OSORIO, Dilcia; JIMENEZ TAMAYO, María; PERDOMO, Wilfredo  and  MORENO, Novis. Impact of management strategies in the basal rot, charcoal rots epidemiology and Phaseolus vulgaris L. yield. J. Selva Andina Res. Soc. [online]. 2012, vol.3, n.2, pp.14-26. ISSN 2072-9294.

The effect of chemical, physical, biologycal and cultural strategies individually or combinated were evaluated in the epidemiology of the basal rot (Sclerotium rolfsii), charcoal rot (Macrophomina phaseolina) and the Phaseolus vulgaris cv Tacarigua yield at Barinas state from Venezuela. In the experiment, Tebuconazole (Teb) was applicated at seed (1 L/Ton) and at soil, a los 30 y 60 days after of the sow (1 L/ha); Trichoderma harzianum (Tri) was applicated at seed (15 g for each 1.5 k) and to 15, 30, 45 y 60  days after of the sow (30 g/10 L of water). On the other hand, soil was solarizated (Sol) during 15 days and calcium nitrate (Ca) (60 g/10 L of water) was applicated each 15 days until 60 days of growth of cultivated plants. Basal rot was registered as far as 42 days after of the sow, showing less of 5.3% in Teb y the combination SolTeb. The hightest incidence of this disease was observed in the treatment Tri with 28.5%, being highter that control (14.5%). Last to 42 days predominated the charcoal rot in the rest of the plants for a total of 100% of incidente in everything the treatments. Nevertheless, Teb showed the hightest yield with 555 k/ha, being different estatistically at treatment TriCa, which showed the lowest yield with 31 k/ha, however, the roots not formed nodules nitrogen uptake in these replications with the fungicide and Ca. It is concluded that S. rolfsii was sensible at action of some of the treatments; but not M. phaseolina; nevertheless, the plants were capables to produce seeds health apparently in treatments in which observed less severity of charcoal rot.

Keywords : Tebuconazole; calcium nitrate; Trichoderma; solarization; Macrophomina phaseolina; Sclerotium rolfsii.

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