Abstract

RODRIGUEZ-QUIEL, Emigdio et al. The biological control of web blight (Thanatephorus cucumeris) in common bean in  Panama. Agron. Mesoam [online]. 2012, vol.23, n.1, pp.13-20. ISSN 2215-3608.

The   objective of this work was to  evaluate the capacity of Trichoderma sp.,  Metarrhizium  anisopliae  and  endophytic  bacteria  of T. cucumeris (Frank) Donk under field  conditions, for the biological  control  of  web  blight  (T.  cucumeris)  in  beans. Applications  of  Bacillus  subtilis,  Trichoderma  sp.  (Strain 2-Villa Margarita), Trichoderma sp. (Strain 1-Colombia) and M. anisopliae (Colombia) at concentration of 2 x 107 conidia/ ml of water), B. subtilis at rates of 0.335, 0.670, 1.005 and 1.340 g ai / ml of water + 36 g ai Chlorothalonil /ha, benomyl 50 WP with doses of 250 g ai / ha and a control treatment were conducted. Results revealed high  differences (P ≤ 0.0003) between treatments; the treatment with lower severity was M. anisopliae, followed by B. subtilis with 1,340 g ai /ml of water + Chlorothalonil at 36 g ai/ha with 11.87% and B.  subtilis to 0,335 g ai /l of water + Chlorothalonil at 36 g ai/ha, with 15.0%. The treatments affected to the greatest degree were B. subtilis with 0,670 g ai/l of water + Chlorothalonil with 36 g ai/ha, Trichoderma sp.  (Strain 2-Villa Margarita) and the control treatment with 26.2%, 22.25% and 21.85% of severity, respectively. The regression equation for the experiment Y = 2502.91-13.021* Sev, was significant and indicated  losses of 13.02 kg for each percent increase of the  disease. The marginal analysis revealed that the treatment with highest gain was M. anisopliae, recording a net profit of 28.34%.

Keywords : Trichoderma; Metarrhizium; Bacillus subtilis.

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