Nematodes usually do not cause distinctive diagnostic symptoms on crops. A sound diagnosis of nematode problems is based on examination of above- and belowground symptoms, field histories, and laboratory analyses of soil and/or plant tissues. A determination of nematode population levels can only be accomplished with a nema-tode assay. The soil must be representative of the site to be checked, and great care should go into sample collection. Since the results of the assay are affected by the condition of the nematodes, it is also
very important that samples be handled properly until they are delivered to the lab.
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