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, Ca nada, the cyst stage of the clover cyst nematode, Heterodera trifolii, was found in 43 of 63 sites sampled; however, only 12% of the cysts c ontained eggs. The root lesion nematode, Pratylenchus penetrans, was t he dominant plant parasitic nematode and was found in 56 sites. Extrac tion of cysts from soil was similar using either the Schuiling centrif uge or the Fenwick can method, although the former was more convenient to use. The modified Baermann funnel method was not efficient for det ecting the clover cyst nematode in soil.