Resumo

REYES DUQUE, Yusimy; INFANTE MARTINEZ, Danay  e  MARTINEZ COCA, Benedicto. Efficacy of Trichoderma asperellum Samuels, Lieckfeldt & Nirenberg in controlling Rhizoctonia solani Kühn under field conditions. Rev. Protección Veg. [online]. 2016, vol.31, n.2, pp. 107-113. ISSN 2224-4697.

The objective of the present work was to establish the application time and dose of Trichoderma asperellum Samuels to control Rhizoctonia solani Kühn under production conditions. Three strains (T.17, T.75, T.78) of the antagonist were evaluated in four application times (seedbed, transplanting, first water stress and maximum tillering), where the applications were to the soil in the first three times and to the foliage in the last one. Subsequently, the resulting best combinations were evaluated at three doses (3.5 x 10¹¹ (1), 3.5 x 10¹² (2) and 3.5 x 10¹³ (3) conidia.ha^-1), under the same conditions. A split plot design was used in the first test and a split split plot design in the second. The results showed that all the evaluated variants could be used as application alternatives in a management program of the crop, but the strains T.17 and T.78 applied to the seedlings or in the first water stress stood out with the highest values of technical efficacy (TE). The strain T.78 at the minimum dose (10¹¹ conidia.ha^-1) showed a TE superior to 70%, which remained at the higher doses evaluated The dose of 10¹¹ conidia.ha^-1 of T. asperellum strains T.78 applied to the seedlings in the transplanting or to the soil in the first water stress was effective to control R. solani.

Palavras-chave : biological control; Cuba; Rhizoctonia; rice; Trichoderma.

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