A Method for Field Infestation with Meloidogyne incognita

Area of Science:

• Plant Nematology
• Agricultural Engineering
• Crop Science

Background:

• Meloidogyne spp. (root-knot nematodes) cause significant crop damage worldwide.
• Accurate field infestation is crucial for testing nematode management strategies.
• Existing inoculation methods are labor-intensive and require large inoculum quantities.

Purpose of the Study:

• To develop a novel, efficient field inoculation method for Meloidogyne spp.
• To reduce labor and inoculum requirements for creating nematode infestation sites.
• To provide a uniform method for establishing nematode populations in field trials.

Main Methods:

• A drip line system attached to a planter delivered nematode egg suspensions during cowpea planting.
• Inoculum concentrations varied (10^2.12 to 10^4.22 eggs/m row).
• Compared machine application with a traditional hand-inoculation method (10^3.1 eggs).

Main Results:

• A linear relationship was observed between inoculation levels and root galling.
• Machine-applied treatments resulted in greater galling than hand-inoculated treatments.
• The new method demonstrated uniform application and effectiveness at low population levels.

Conclusions:

• The developed field inoculation technique is efficient, requiring minimal inoculum and labor.
• This method ensures uniform nematode infestation at planting time, ideal for field testing.
• It offers a significant improvement over traditional methods for establishing Meloidogyne spp. in research settings.