Biological control of Phytophthora root rot of avocado with microorganisms grown in organic mulches
Braz. j. microbiol
;
31(4): 239-246, oct.-dec. 2000. ilus, tab
Article
Dans Anglais, Portugais
| LILACS
| ID: lil-299817
RESUMO
Organic mulches colonized with microbial biocontrol agents, termed bioenhanced mulches, were tested for their ability to reduce Phytophthora root rot of avocado (Persea americana Mill.). Benomyl-resistant mutants of Gliocladium virens (KA 230-1) and Trichoderma harzianum (KA 159.2) isolated from suppressive soils and selected as efficient antagonists of P. cinnamomi were evaluated for their ability to colonize different mulches under controlled laboratory conditions. Sudangrass and a coarse yardwaste were found to be better substrates than a fine yardwaste, woodwaste or rice hulls for biocontrol agents propagules production. The most suitable conditions for colonization were an optimum temperature of 24 C, a moisture content of 20 ( per cent) for sudangrass and 30 ( per cent) for the coarse yardwaste, and a continuous light exposure during a 15-day incubation period. In the greenhouse, fresh sudangrass and coarse yardwaste colonized with G. virens and used as a surface mulch proved to be the best combination for reducing the population of P. cinnamomi in 4-liter pots containing artificially-infested soil. Healthy avocado roots made up 31-37 ( per cent) of the roots in the G. virens-mulch combinations compared to 0 ( per cent) healthy in infested controls after two months.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Phytophthora
/
Trichoderma
/
Techniques in vitro
/
Lutte biologique contre les nuisibles
/
Lauraceae
/
Eucaryotes
langue:
Anglais
/
Portugais
Texte intégral:
Braz. j. microbiol
Thème du journal:
Microbiologie
Année:
2000
Type:
Article
Pays d'affiliation:
Brésil
/
États-Unis d'Amérique
Institution/Pays d'affiliation:
Embrapa Arroz e Feijão/BR
/
University of California/US
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