The sugar beet cyst nematode（SBCN）, Heterodera schachtii Schmidt（Rhabditida: Hoplolaimidae）, was first detected in Japan in 2017 and has since been officially controlled using chemical nematicides. Resistant cultivars and cultural practices against SBCN have been investigated, and two radish cultivars have been selected as a trap crop available in Japan. However, there is limited information on the ecology of the SBCN population in Japan. Among its various ecological traits, hatching is particularly important because of its direct impact on the effectiveness of cultural control measures and the survival period of the nematode. In this study, we conducted long-term hatching tests using field-collected SBCN cysts to explore the hatching dynamics of the nematode. Hatching of SBCN second-stage juveniles（J2）continued for 28 weeks, with approximately 85% of J2 emerging within 8 weeks. Our results indicate that the hatching of SBCN under field conditions can continue for a long time.
Yosano et al. (Thu,) studied this question.