Meloidogyne javanica is a species of plant-parasitic nematodes, commonly known as root-knot nematodes. They are microscopic roundworms that primarily infect the roots of various plants, causing significant agricultural damage. These nematodes create galls or "knots" on the roots, which can hinder nutrient and water uptake, leading to reduced plant growth and yield. This nematode is particularly problematic for crops such as tomatoes, potatoes, and soybeans. Control methods include crop rotation, resistant plant varieties, and chemical treatments. Understanding and managing Meloidogyne javanica is essential for maintaining healthy crops and sustainable agriculture.