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Pochonia chlamydosporia reduces the multiplication rate of Globodera pallida in potato crops.

This is the first report of the successful use of Pochonia chlamydosporia as a biological control agent against potato cyst nematodes in potato crops under commercial field conditions

Year of Publication2008

Two field experiments were undertaken in 2006 and 2007 at different field sites in Shropshire to assess the effects of the nematophagous fungus Pochonia chlamydosporia and the nematicide fosthiazate on the multiplication rate of potato cyst nematodes Globodera pallida and G. rostochiensis. Treatments consisted of an untreated control, P. chlamydosporia, P. chlamydosporia with the nematicide fosthiazate and fosthiazate on its own. In both experiments significant reductions in the nematode multiplication rate (Pf/Pi) for P. chlamydosporia treated plots were observed when compared with the untreated control. The P. chlamydosporia treatment did not differ significantly from the fosthiazate treatments of Pf/Pi, demonstrating that the biological control agent was as effective as fosthiazate at reducing nematode multiplication. The combined treated did not provide any additional reduction in Pf/Pi but demonstrated that P. chlamydosporia was compatible with fosthiazate. Over the different developmental stages of the juveniles there was evidence of parasitisation of J5 females on the plant root by P. chlamydosporia. Root colonization by P. chlamydosporia tended to be higher in the P. chlamydosporia treatment due to increased levels of juvenile nematodes in roots. The reduction in nematode multiplication rate from P. chlamydosporia treatment lowers the initial nematode population density for the next potato crop, reducing both potential yield loss and the need for a nematicide. Alternately, this lower nematode population density following P. chlamydosporia treatment allows a potato grower to maintain a closer rotation length. The use of P. chlamydosporia could help provide long term control of PCN and would be best used with other management strategies as part of an integrated approach for conventional and organic potato production. This is the first report of the successful use of P. chlamydosporia as a biological control agent against potato cyst nematodes in potato crops under commercial field conditions and represents an important step in the development of biological control for PCN for use as part of an integrated pest management strategy.

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Additional keywords/tags

potato pestsnematodesbiological control
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Supporting the development of the national rural economy.

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