Effects of Root-knot Nematodes on Areca catechu

Area of Science:

• Plant Pathology
• Nematology
• Horticulture

Background:

• Betel palm (Areca catechu) is an economically important crop.
• Root-knot nematodes (Meloidogyne spp.) are significant plant pathogens causing substantial agricultural losses worldwide.
• Understanding the susceptibility of Areca catechu to various Meloidogyne species is crucial for crop management.

Purpose of the Study:

• To evaluate the pathogenicity of five common root-knot nematode species/races on betel palm.
• To assess the impact of Meloidogyne spp. on Areca catechu root and shoot development.

Main Methods:

• Areca catechu seedlings were inoculated with Meloidogyne arenaria, M. hapla, M. incognita (races 1 and 3), and M. javanica.
• Plants were assessed at 3 and 9 months post-inoculation for root galling, egg mass formation, fresh root weight, and top weight.
• Data were compared against uninoculated control groups.

Main Results:

• No root galling or egg masses were observed on betel palm inoculated with any of the tested Meloidogyne species/races.
• A significant reduction in fresh root weight was noted at 3 months only with Meloidogyne incognita race 1.
• No significant differences in root or top weight were found between inoculated and control plants at 9 months, or in top weight at 3 months.

Conclusions:

• Betel palm (Areca catechu) exhibits resistance to galling and egg mass formation by the tested Meloidogyne species and races.
• Meloidogyne incognita race 1 may cause a transient, minor reduction in root biomass, but it does not lead to long-term growth impairment.
• Areca catechu is not a suitable host for these common root-knot nematodes, suggesting low susceptibility.