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

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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%).

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/content/journals/10.1163/156854106776179926
2006-03-01
2016-12-07

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