Excerpt from Manual of Survey and Laboratory Methods Used by the Division of Golden Nematode Control

The nematode lives on potato and tomato plant roots, from which it extracts the juices thereby retarding plant growth and reducing crop yield. Following penetration of the root epidermis for feed ing purposes the posterior portion of the fertilized female larva containing the egg.masses extrudes outside the root surface. It develops into a white, lustrous, spherical like cyst which later changes in color to yellow or orange and subsequently to red or brown. The.mature cysts are easily detached from potato roots and remain in the soil where they are difficult to detect. Cysts, or larvae therefrom, are easily disseminated by the movement of seil from infested fields and by natural means such as wind and water flow. This nematode is not an internal parasite of potatoes, and its known ability to survive in the sell for periods ranging up to 8 years in the absence of its primary host makes control by crop rotation most difficult. Nematode population increases will occur in lands planted to potatoes for successive years without rotation and progressive reduction in crop yields may be expected. It is very important that this organism be recognized at an early stage before crop damage becomes apparent. The best method available for the detection of golden nematode is the collection of samples of soil from potato and tomato fields and the microscopic examination of Wash residues of such samples.ersonnel assigned to soil survey activities normally are divided ito crews, each consisting of two or three men, one of whom.is signeted as the crew leader. The number of men assigned to surey a given property or area will vary in accordance with the dis - rict in which they Operate and the scope of such Operations. It ill be found that on the average one man can survey 25 acres per ay; therefore, the crew may be varied from one to several.men de ending upon the type andtsoope of survey to be conducted.

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