Evaluation of Paecilomyces lilacinus strain 251 for the biological control of the northern root-knot nematode Meloidogyne hapla Chitwood

Abstract The egg-pathogenic fungus Paecilomyces lilacinus strain 251 (PL215) was investigated under different temperature regimes for biocontrol activity against the northern root-knot nematode Meloidogyne hapla. Biocontrol activity by PL251 was affected by temperature and initial nematode inoculum...

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Bibliographic Details
Published in:Nematology : international journal of fundamental and applied nematological research 2006-01, Vol.8 (1), p.69-78
Main Authors: Kiewnick, Sebastian, Sikora, Richard A
Format: Article
Language:English
Subjects:
BIOACTREG
Biological and medical sciences
Biological control
biological control agents
Control
crop yield
Fundamental and applied biological sciences. Psychology
FUNGI
inoculum density
LYCOPERSICON ESCULENTUM
Meloidogyne hapla
nematode control
nematophagous fungi
Paecilomyces lilacinus
Phytopathology. Animal pests. Plant and forest protection
Protozoa. Invertebrates
root galls
root-knot nematodes
Solanum lycopersicum var. lycopersicum
TEMPERATURE
TOMATO
tomatoes
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Summary:Abstract The egg-pathogenic fungus Paecilomyces lilacinus strain 251 (PL215) was investigated under different temperature regimes for biocontrol activity against the northern root-knot nematode Meloidogyne hapla. Biocontrol activity by PL251 was affected by temperature and initial nematode inoculum density. At 20/23°C (night/day) control efficacy reached 71% at a high inoculum density of 10 000 eggs and juveniles (E + J) per 500 cm3 compared to 65% control at the lower inoculum density (5000 E + J/500 cm3). By contrast, average efficacy was 5% and 46% at low and high inoculum levels, respectively, when temperatures were between 19°C and 21°C (night/day). A significant interaction between the factors inoculum density and treatment with PL251 was observed at low temperatures, when only few M. hapla galls and egg masses developed after inoculation with 5000 E + J/500 cm3. When the temperature was favourable for the fungal parasite (25°C), efficacy reached 90%. In glasshouse experiments with unfavourable temperatures for M. hapla development (25°C-33°C), tomato plants repeatedly treated with PL251 showed significantly higher fruit yield (23-102%).
ISSN:1388-5545
1568-5411
1388-5545
DOI:10.1163/156854106776179926