Combate biológico de la Mustia Hilachosa (Thanatephorus cucumeris) en el frijol en Panamá

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%.