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Temperature: a driving factor for Meloidogyne floridensis migration toward different hosts
Diego A H S Leitão1, Elvira M R Pedrosa2, Donald W Dickson1
1Entomology and Nematology Department, University of Florida, Gainesville, FL, 32608.
Journal of Nematology
|August 16, 2021
Summary
Temperature significantly impacts peach root-knot nematode (Meloidogyne floridensis) migration, with cooler temperatures (20°C) promoting faster vertical movement. French marigold did not impede migration but showed reduced nematode penetration.
Area of Science:
- Plant Nematology
- Agricultural Entomology
- Soil Ecology
Background:
- The peach root-knot nematode, *Meloidogyne floridensis*, is an emerging pest threatening peach cultivation.
- Understanding nematode behavior is crucial for developing effective control strategies.
Purpose of the Study:
- To investigate the influence of temperature and host plants (tomato and French marigold) on the vertical migration of *M. floridensis* second-stage juveniles (J2).
- To assess the impact of these factors on J2 penetration into plant roots.
Main Methods:
- Segmented soil columns (14 cm) were used to track J2 migration.
- Columns were maintained at two temperatures (20°C and 26°C) with or without tomato and French marigold.
- Nematode distribution and root penetration were quantified at various time points (3, 6, 9, 12 days after injection).
Main Results:
- *M. floridensis* J2 exhibited optimal vertical migration at 20°C, covering over 13 cm within 3 days.
- Higher temperatures (26°C) delayed long-distance migration, though J2 distribution became similar across temperatures by 12 days.
- Plant presence did not enhance J2 migration; French marigold showed lower J2 root penetration compared to tomato.
Conclusions:
- Temperature is a key factor influencing the speed of *M. floridensis* vertical migration in soil.
- French marigold may offer some resistance to *M. floridensis* penetration, warranting further investigation for its potential as a cover crop or interplant.
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