Which nematode is known as the stubby root nematode affecting carrots?

The stubby root nematode, specifically affecting carrots, is known as Paratrichodorus spp. This group of nematodes is characterized by their impact on the roots of various plant species, leading to stunted growth and poor yield. The stubby root nematode affects carrots by invading the root system, resulting in a characteristic stubby appearance and causing significant damage, which ultimately can reduce the quality and marketability of the carrots produced.

Paratrichodorus spp. thrive in certain soil conditions, often in fields that are poorly drained or have high organic matter. Their presence is a concern for farmers as they can lead to economic losses due to reduced root growth and health, making their identification and management critical in carrot production and other susceptible crops.

In contrast, other nematodes listed in the options, such as Longidorus africanus and Meloidogyne javanica, have different characteristics and effects on plants. Longidorus africanus typically targets other host plants, while Meloidogyne javanica is known as a root-knot nematode, which causes galls on roots and affects other crops differently. Verticillium dahliae is a fungal pathogen rather than a nematode,