Survey on potato cyst nematodes in England and Wales
A survey has been carried out in England and Wales (United Kingdom) for the presence of potato cyst nematodes (Globodera rostochiensis, G. pallida – both on the EPPO A2 list). The aim was to estimate the proportion of potato fields infested with potato cyst nematodes and to determine the relative abundance of the two species. From 1997 to 1998, soil samples were collected from fields where potato had been grown the previous year. 284 potato growers had agreed to participate to this study. Results showed that potato cyst nematodes were found in 64 % of tested samples (a similar study done in 1996 had given 42 %). G. pallida is the predominant species found in England and Wales: 8% of the populations were G. rostochiensis, 67% G. pallida and 25 % were mixed populations. In most cases, population densities were low (62 % of the infestations had a density of less than 10 eggs g-1 soil). G. pallida was mainly found in the eastern counties of Lincolnshire, Yorkshire and Cambridgeshire where many potatoes are grown. G. rostochiensis was present in eastern and western countries, almost equally, frequently in the same locations as G. pallida. Significant relationships were observed between species of potato cyst nematodes found and the use of resistant and non-resistant potato cultivars. It is concluded that priority should be given to
preventing further spread of these nematodes to potato-growing land and that integrated management strategies (use of resistant cultivars, nematicides, longer crop rotations, and possibly trap cropping) should be recommended to growers.
Sources
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Minnis, S.T.; Haydock, P.P.J.; Ibrahim, S.K.; Grove, I.G., Evans, K.; Russell, M.D. (2002) Potato cyst nematodes in England and Wales – occurrence and distribution.
Annals of applied Biology, 140(2), 187-195.
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