Evaluación de aislados de Trichoderma spp., sobre Alternaria sp., en el cultivo de pitahaya (Selenicereus sp)., en condiciones de invernadero.

Abstract

The objective of this study was to evaluate isolates of Trichoderma spp., on Alternaria sp., to determine isolates with capacity to control Alternaria sp., through tests in greenhouse conditions. The evaluation 4 isolates of the genus Trichoderma were carried out. Trichoderma, the genus spores’ number Alternaria sp. and Trichoderma spp. was counted, to apply in the pitahaya sprouts (Selva spp. spores of the genus Alternaria sp. and Trichoderma spp. were counted. A completely randomized design with three replicates design with three replicates per treatment was used. In the trials, the competition variables and the biocontrol the biocontrol capacity of Trichoderma spp. isolates were evaluated. The statistical analysis was performed using general linear and mixed models. Based on the results obtained, the Treatment six (consortium) presented greater distance between isolates of the genus Trichoderma of 0.199 mm, which differs from the other treatments. In the antagonistic level of the isolates of Trichoderma spp. on Alternaria sp. the treatments one and two presented a level 41 and 35; the amount of Alternaria spp. scab on pitahaya shoots, Treatment four (isolate 26) presented a lower incidence of Alternaria spp. scab on pitahaya shoots. 26) presented less incidence of scab with a quantity of 1; concluding that at least two isolates of the genus Trichoderma spp. isolates of the genus Trichoderma do present antagonistic capacity on Alternaria sp. in greenhouse conditions. under greenhouse conditions. It is recommended to carry out the biocontrol tests in field conditions. field conditions.