The initial stage in the life cycle of a plant-parasitic nematode is the egg stage. In this stage, the nematodes are encapsulated within a protective shell, which provides them with a secure environment for development. After the eggs hatch, juvenile nematodes emerge, which then go through several molts before reaching adulthood. The egg stage is critical because it ensures the survival of the species during unfavorable conditions and allows for population growth.
While the juvenile stage and larval stage are subsequent phases in the life cycle, they occur after the egg has hatched. The adult stage represents the final phase in the life cycle where reproduction occurs, hence it does not represent the initial stage. Understanding the life cycle of plant-parasitic nematodes, starting from the egg stage, is vital for effective pest management strategies in agriculture.