Identification and in vitro antibiosis of Trichoderma spp., against foliar phytopathogenic fungi.

Abstract

Samples of indeterminate tomatoes, rose and guava

that had necrotic spots were collected.The

Postulates of Koch (Agrios, 2005) were carried out

to verify the pathogenicity of each isolate, for this

test, healthy and ripe fruits of tomato and guava

were used in addition to healthy roses. The causal

agent was identified by morphological

characteristics, and in vitro antibiosis of native and

commercial strains of Trichoderma spp. Was tested

against the isolated pathogens of tomato, rose and

guava. From tomato stems, Alternaria sp. Was

isolated and identified, it was found to be

pathogenic when inoculated on healthy fruits;

pathogenicity in tomato fruits; in rosal

Colletotrichum sp. was identified, which turned out

to be pathogenic when inoculated in healthy beans,

finally in guava we identified Pestalotiopsis sp. as a

pathogen of guava. Under in vitro conditions all the

native and commercial strains of Trichoderma spp.

recorded fungistatic activity on Alternaria sp.,

Colletotrichum sp. and Pestalotiopsis sp.;

Trichoerma asperellum native to Cocula and chilapa

obtained the highest inhibition of Alternaria sp.,

Trichoderma sp. native strain of San Marcos

showed the best control of Pestalotiopsis sp., finally

Trichoderma sp. native strain of Tixtla, Gro.He

presented the greatest inhibition of Colletotrichum

sp. Isolated of rose.