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Occurrence of the Clover Cyst Nematode, Heterodera trifolii, in Prince Edward Island Soils.

In a survey of potato and rotational crops on Prince Edward Island, Canada, the cyst stage of the clover cyst nematode, Heterodera trifolii, was found in 43 of 63 sites sampled; however, only 12% of the cysts contained eggs. The root lesion nematode, Pratylenchus penetrans, was the dominant plant parasitic nematode and was found in 56 sites. Extraction of cysts from soil was similar using either the Schuiling centrifuge or the Fenwick can method, although the former was more convenient to use. The modified Baermann funnel method was not efficient for detecting the clover cyst nematode in soil.