Evaluation of Streptomyces spp. for the biological control of corky root of tomato and Verticillium wilt of eggplan

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Abstract

The effects of Streptomyces spp. isolates in the biological control of corky root of tomato and Verticilliumwilt of eggplant was determined in in vitro, greenhouse and field trials. Twenty-six Streptomyces spp.isolates were obtained from the rhizospheres of different vegetable crops in southern Italy. In in vitrodual culture tests, mycelial radial growth of Pyrenochaeta lycopersici and Verticillium dahliae was reducedup to 18.6% and 30.1%, respectively. Radial growth of seven other fungal pathogens was variably reducedas well. The isolates StB-3, StB-6, StB-11 and StB-12 showed a good antagonistic effect against bothP. lycopersici and V. dahliae, while the rest of isolates eventually showed antagonism against only onepathogen.In pot-experiments in the greenhouse three of the four above-mentioned Streptomyces spp. isolatessignificantly reduced corky root up to 64.9% (StB-11), and all four isolates reduced foliar symptoms ofVerticillium wilt (AUDPC) up to 48.3%, but none of them reduced the severity of vascular browning. Innaturally infested field trials, StB-11 significantly reduced corky root severity in tomato by 48.2%, StB-12 by 35% and StB-6 by 32.6%, but none of the isolates were effective in controlling Verticillium wiltof eggplant. The effectiveness of the streptomycete AtB-42, successfully used in previous researches,was here confirmed as it reduced corky root of tomato in the field by 33.6%. In conclusion, our researchdemonstrates that under field conditions corky root of tomato, but not Verticillium wilt of eggplant, canbe effectively controlled by the Streptomyces spp. isolates used in this study.

Autore Pugliese

Tutti gli autori

  • Bubici G.; Marsico Antonio D.; D'Amico M.; Amenduni M.; Cirulli M.

Titolo volume/Rivista

Applied soil ecology

Anno di pubblicazione

2013

ISSN

0929-1393

ISBN

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Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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