Grass gall nematode

Systematic position: The grass gall nematode Anguina graminis belongs to the order Tylenchida and the family Anguinidae. It is a specialized phytoparasitic nematode that induces the formation of galls on the vegetative and reproductive parts of various grass species.

Host plants: This pest primarily affects perennial grasses, including species of Festuca, Poa, and Agrostis. It is particularly problematic in seed production fields, where infestations can lead to significant economic losses and a decrease in the quality of forage seeds.

Biology and life cycle: The life cycle is intricately linked to the growth phases of the host plant. Second-stage juveniles penetrate the meristematic tissues of the plant, triggering the development of galls. Within these abnormal structures, the nematodes feed, molt, and reproduce, eventually emerging to infest new host plants or remaining dormant until favorable conditions return.

Nature of damage: Damage is manifested by stunted growth, twisted and thickened leaves, and the presence of visible galls or swellings. These symptoms occur because the nematode disturbs the normal hormonal balance and vascular structure of the plant, resulting in reduced biomass and inhibited seed head formation.

Control measures: Management strategies focus primarily on sanitation and cultural practices. The most effective approach is the use of nematode-free certified seeds. Integrated pest management should also include crop rotation with non-host species, deep plowing to bury infested plant debris, and the removal of wild grass weeds that act as alternate hosts.

• Strict inspection of imported and domestic seed lots.
• Implementation of multi-year crop rotations.
• Strategic mowing to prevent nematode reproduction in seed heads.