Manejo Biologico de Phytophthora capsici Leo., Fusarium oxysporum Schlechtend.:Fr. y Rhizoctonia solani Kuhn en Jitomate {Lycopersicon esculentum Mili.)
Fernandez-Herrera. E Acosta-Ramos. M Ponce-Gonzalez. F Manuel-Pinto. V
Revista Mexicana de Fitopatologi ; 2007 [Vol.25] Pages:35-42
Abstract
The influence of four commercial biological products on incidence of the phytopathogenic root fungi Phytophthora capsici, Rhizoctonia solani, and Fusarium oxysporum was evaluated, as well as their influence on growth
of tomato plants cv. Rio Grande. P. capsici (5 x 104 zoospores
mL-1), R. solani (2% infected grain, v:v; grain:soil), F.
oxysporum (5 x 10-1 conidia mL-1), and a mixture ofthe three fungi at the same concentration were used as inocula. Disease incidence was evaluated 50 days after inoculation, and seedling height and total dry biomass were quantified when they were 35 days old in the gennination trays. A completely randomized design with three replications per treatment was used. The experimental unit consisted of five seedling per replication. The products evaluated did not protect tomato seedlings from infection by P. capsici, F. oxysporum, and tlie mixture ofthe three phytopathogens. However, infection by R. solani was reduced efficiently with these products: T22 (Trichoderma harzianum) which gave a 100% protection, while Bio, End, and 343 gave 73.3%. Plant height increased 162.7, 149.4, and 47% with Bio, Bio + End, and End + 343, respectively, while total dry biomass increased 320.7,314.6, and 57.3%, respectively, in relation to the control.
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