<abstract xmlns="http://www.w3.org/1999/xhtml">

The potato cyst nematodes (PCN), <italic>Globodera rostochiensis</italic> (Woll.) and <italic>G. pallida</italic> (Stone), are important pests of potato globally. Due to their extensive damage potential and the challenge of managing them, these nematodes are under strict regulations in many countries; however, despite these regulations, PCN continue to spread into new areas and countries. In Kenya, <italic>G. rostochiensis</italic> was first reported in 2015 and <italic>G. pallida</italic> was reported three years later, both in Nyandarua County. Research was conducted to characterize the biology, pathotype, and virulence of <italic>G. rostochiensis</italic> populations from Kenya in glasshouse and laboratory studies. The development of <italic>G. rostochiensis</italic> was assessed in roots of susceptible potato ‘Désirée’ and resistant ‘Laura’ carrying the H1 resistance gene. The ‘HAR1’ population from Kenya and ‘Ecosse’ from Germany were not able to produce females in the roots of the resistant potato ‘Laura’. The rate of root penetration by <italic>G. rostochiensis</italic> juveniles did not differ (<italic>p</italic> > 0.05) between populations and cultivars. However, in the resistant cultivar, juveniles developed into males only. A total of 736 cumulative degree-days at 6°C base temperature (DD6) were required by ‘HAR1’ to complete the life cycle on ‘Désirée’, whereas ‘Ecosse’ completed the life cycle within 645 DD6. The Kenyan populations lacked obligatory diapause and high numbers of juveniles hatched immediately after maturity. Consequently, the Kenyan populations had the potential to complete up to three reproduction cycles in less than a year. On selected potato cultivars, the populations from Kenya failed to reproduce on 10 out of 13 commercial cultivars tested. The 10 cultivars carried the H1 resistance gene, which suggests that the <italic>G. rostochiensis</italic> populations tested belong to the Ro1/4 pathotype group. The virulence of the <italic>G. rostochiensis</italic> populations from Kenya did not differ from that of the standard reference population ‘Ecosse’ and therefore can be effectively managed with the commercially available potato cultivars carrying the H1 resistance gene.
</abstract>

The potato cyst nematodes (PCN), Globodera rostochiensis (Woll.) and G. pallida (Stone), are important pests of potato globally. Due to their extensive damage potential and the challenge of managing them, these nematodes are under strict regulations in many countries; however, despite these regulations, PCN continue to spread into new areas and countries. In Kenya, G. rostochiensis was first reported in 2015 and G. pallida was reported three years later, both in Nyandarua County. Research was conducted to characterize the biology, pathotype, and virulence of G. rostochiensis populations from Kenya in glasshouse and laboratory studies. The development of G. rostochiensis was assessed in roots of susceptible potato ‘Désirée’ and resistant ‘Laura’ carrying the H1 resistance gene. The ‘HAR1’ population from Kenya and ‘Ecosse’ from Germany were not able to produce females in the roots of the resistant potato ‘Laura’. The rate of root penetration by G. rostochiensis juveniles did not differ (p > 0.05) between populations and cultivars. However, in the resistant cultivar, juveniles developed into males only. A total of 736 cumulative degree-days at 6°C base temperature (DD6) were required by ‘HAR1’ to complete the life cycle on ‘Désirée’, whereas ‘Ecosse’ completed the life cycle within 645 DD6. The Kenyan populations lacked obligatory diapause and high numbers of juveniles hatched immediately after maturity. Consequently, the Kenyan populations had the potential to complete up to three reproduction cycles in less than a year. On selected potato cultivars, the populations from Kenya failed to reproduce on 10 out of 13 commercial cultivars tested. The 10 cultivars carried the H1 resistance gene, which suggests that the G. rostochiensis populations tested belong to the Ro1/4 pathotype group. The virulence of the G. rostochiensis populations from Kenya did not differ from that of the standard reference population ‘Ecosse’ and therefore can be effectively managed with the commercially available potato cultivars carrying the H1 resistance gene.

<article-title xml:lang="en">Biology, pathotype, and virulence of <italic>Globodera rostochiensis</italic> populations from Kenya

Journal of Nematology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Biology, pathotype, and virulence of  populations from Kenya

The potato cyst nematodes (PCN), Globodera rostochiensis (Woll.) and G. pallida (Stone), are important pests of potato globally. Due to their extensive damage...

Biology, pathotype, and virulence of Globodera rostochiensis populations from Kenya

Published Online: Jan 01, 2021

Page range: 1 - 3

DOI: https://doi.org/10.21307/jofnem-2021-003

Keywords
Diapause, Management, Pathotype, Resistance genes, Virulence

© 2021 Authors, published by Sciendo.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Biology, pathotype, and virulence of Globodera rostochiensis populations from Kenya

Published Online: Jan 01, 2021

Page range: 1 - 3

DOI: https://doi.org/10.21307/jofnem-2021-003

KeywordsDiapause, Management, Pathotype, Resistance genes, Virulence

© 2021 Authors, published by Sciendo.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
Diapause, Management, Pathotype, Resistance genes, Virulence