Nothotylenchus acris

Nothotylenchus acris is a plant-parasitic nematode belonging to the order Tylenchida and the family Anguinidae. It acts as an endoparasite, invading the internal tissues of its host plants.

Adult nematodes are microscopic, thread-like organisms, typically measuring less than 1 mm in length. Due to their minute size, they are impossible to identify without laboratory processing.

The biology of this species is highly moisture-dependent. It uses a specialized structure called a stylet to pierce plant cell walls and consume cellular contents, which is its primary nutritional source.

The life cycle encompasses an egg stage, four larval stages, and the adult stage. Development rate is directly proportional to temperature, allowing for multiple generations in a single growing season.

Nothotylenchus acris exhibits remarkable resilience, capable of entering a state of anhydrobiosis (dormancy) to survive environmental stress, making it difficult to eradicate from soil.

The primary host of this nematode is the garden strawberry, although it is capable of infesting various other vegetable and ornamental crops, causing significant yield losses.

The nematode targets the aerial parts of the plant, including leaves, petioles, and flower stalks. By extracting vital fluids, it disrupts the host's normal metabolism and physiological processes.

Infested plants exhibit stunted growth, reduced leaf area, and poor berry quality, which directly impacts the commercial viability of the strawberry crop.

The feeding activity creates necrotic lesions within plant tissues, which often serve as entry points for secondary pathogens such as bacteria and fungi, exacerbating the damage.

Heavy infestations can lead to total crop failure, necessitating the removal of entire beds to prevent further spread across the plantation.

Early signs of infestation include severe deformation of leaves, which often appear crinkled, thickened, and chlorotic, displaying irregular yellowish patches.

Flower stalks become distorted, twisted, or shortened, which leads to bud abortion and a significant reduction in the total number of berries produced per plant.

Stunting of the entire plant, characterized by shortened internodes and a general lack of vigor, is a common indicator of a high nematode population.

• Twisted and brittle petioles and flower stalks.
• Premature dropping of flower buds.
• Reduced plant vigor and overall yield.

Confirming the presence of the pest requires specialized laboratory techniques, such as the Baermann funnel extraction method, to isolate the nematodes from leaf tissue samples.

The primary strategy for management is the use of nematode-free planting material. Always source transplants from certified nurseries that practice strict phytosanitary protocols.

Implement a rigorous crop rotation program. Do not replant strawberries in the same area for at least 4 to 5 years after an infestation has been identified.

Sanitation is critical; all plant debris must be carefully removed and destroyed, as nematodes can survive in soil and decaying matter for extended periods.

Hot water treatment of strawberry crowns (soaking in water at controlled high temperatures) is an effective non-chemical method to disinfest planting material.

Avoid the movement of soil or plant material from infested fields to clean areas. Disinfect all farming equipment thoroughly to prevent mechanical transmission of the pathogen.