نبذة مختصرة : Movement of vermiform stages of Meloidogyne incognita, Rotylenchulus reniformis, Ditylenchus phyllobius, Steinernema glaseri, and Caenorhabditis elegans in response to carbon dioxide was studied in 40- and 72-mm-long cylinders of moist sand inside 38-mm-d acrylic tubes. Meloidog,yne incognita, R. reniformis, and S. glaseri were attracted to CO[sub2] when placed on a linear gradient of 0.2%/cm at a mean CO[sub2] concentration of 1.2%. When CO[sub2] was delivered into the sand through a syringe needle at flow rates between 2 and 130 [mu]l/minute, the optimal flow rate for attracting M. incognita and R. reniformis was 15 [mu]l/minute, and maximal attraction of the two species from a distance of 52 mm was achieved after 29 and 40 hours, respectively. After 24 hours, a total CO[sub2] volume of 20 cm³ was sufficient to induce 96% of all M. incognita introduced to move into the half of the cylinder into which CO[sub2] was delivered and more than 75 % to accumulate in the 9 cm³ of sand volume nearest the source. Results indicate it may be possible to use a chemical or biological source of CO[sub2] to attract nematodes to nematicide granules or biocontrol agents. Key words: behavior, Caenorhabditis elegans, carbon dioxide, chemotaxis, Ditylenchus phyllobius, Meloidogyne incognita, nematode, Rotylenchulus reniformis, Steinernema glaseri.
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