Pathogenicity and Histopathology of Meloidogyne graminis Infecting 'Tifdwarf' Bermudagrass Roots

Area of Science:

• Plant Pathology
• Nematology
• Horticulture

Background:

• Bermudagrass is a vital turfgrass species.
• Plant-parasitic nematodes can cause significant damage to turfgrass.
• Meloidogyne graminis is a known plant pathogen.

Purpose of the Study:

• To determine the pathogenicity of Meloidogyne graminis on Tifdwarf bermudagrass.
• To understand the histopathological effects of M. graminis infection in bermudagrass.

Main Methods:

• Greenhouse experiment with inoculated and non-inoculated Tifdwarf bermudagrass.
• Measurement of plant weight (roots and tops) and clipping weight.
• Histopathological examination of nematode feeding sites and reproduction.

Main Results:

• Meloidogyne graminis significantly reduced root and top weight by 28.4% and clipping weight by 68.9%.
• Histopathology revealed nematode penetration into the vascular system, leading to giant cell formation.
• Nematodes deposited eggs in the cortex, with M. graminis showing a specific feeding orientation.

Conclusions:

• Meloidogyne graminis is pathogenic to Tifdwarf bermudagrass, causing substantial growth reduction.
• The nematode's feeding behavior and histopathological effects contribute to turf damage.
• Understanding these interactions is crucial for managing nematode-infested bermudagrass turf.