Comparison of Millet and Sorghum-Sudangrass Hybrids Grown in Untreated Soil and Soil Treated with Two Nematicides

A. W. Johnson, G. W. Burton

Abstract


Aldicarb and Bay 68138 (ethyl 4-(methylthio)-m-tolyl isopropylphosphoramidate) were effective in increasing the plant height and yield of millet and sorghum-sudangrass hybrids. Stunting of plants and reduction in yield were inversely proportional to the number of Pratylenchus spp. and Belonolaimus longicaudatus present in the rhizosphere. Millet and sorghum-sudangrass hybrids supported large numbers of Criconemoides ornatus, Pratylenchus spp., B. longicaudatus, and Xiphinema americanum. Funk's sorghum × sudangrass Hybrid 78 was more sensitive to injury by the nematode complex than were Tift 23A × 186 or Gahi-I pearl millet. 'Tiflate' pearl millet was more resistant than other millets or sorghums to injury caused by C. ornatus, Pratylenchus spp., Trichodorus christiei, and B. longicaudatus. Millet and sorghum-sudangrass hybrids are poor summer cover crops because they favor intensive development of P. brachyurus, P. zeae, T. christiei, and B. longicaudatus. Key Words: chemical control, nematodes, Pratylenchus brachyurus, P. zeae.

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