Columbia Lance Nematodes, Rye, and Telone II

Daryl T. Bowman and Osman A. Gutierrez


Columbia lance nematodes (Hoplolaimus columbus Sher.) are an important pathogen on cotton (Gossypium hirsutum L.) in Georgia, South Carolina, and North Carolina. Field screening studies for tolerance or resistance to this nematode have been conducted in North Carolina for four years in one field infested with the nematode. Each year the grower has been planting rye as a cover crop and disking the rye the middle of February to the middle of March depending on soil conditions. In 1993 wet soils prevented any field operations until the middle of April. By this time the rye had grown to six feet (2m) tall. The screening study involved treating two rows of each four-row plot with Telone II (1,3 dichloropropene) and not treating the other two rows. The trial was planted two weeks later. Mid-season nematode counts revealed no difference in nematode numbers between treated and nontreated plots; both were low. Samples one month later (late July) revealed nematode counts starting to rise in the nontreated plots. At harvest time (late October) nematode counts in the nontreated plots had risen to that found at mid-season in previous years. Lint yields revealed no differences between treated and nontreated plots. It is speculated that bacteria decomposition of the rye residue suppressed the Columbia lance nematode population; this phenomenon has been shown relative to root-knot nematodes (Meloidgyne incognita) in a study in Canada in the early 1960s.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pg. 701
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998