Colyer P D, Kirkpatrick T L, Caldwell W D, Vernon P R
Louisiana Agricultural Experiment Station, Red River Research Station, P.O. Box 8550, Bossier City 71113-8550.
Arkansas Agricultural Experiment Station, Southwest Research and Extension Center, Hope 71801.
Plant Dis. 1997 Jan;81(1):66-70. doi: 10.1094/PDIS.1997.81.1.66.
Eight cotton cultivars, with and without aldicarb treatment, were evaluated for their effect on the severity of the root-knot nematode-Fusarium wilt disease complex in cotton. A randomized complete block design with a split-plot arrangement of treatments was used with cotton cultivars as the main plots and nematicide treatments as the subplots. Results in 1994 and 1995 were similar. Yield of lint, boll weight, and wilt and root-gall ratings were different among cultivars and between nematicide treatments both years. Increased lint yield and boll weight, and reduced root-gall and wilt ratings were associated with application of aldicarb. Increased lint percentage was associated with application of aldicarb in 1994, but not in 1995. Fiber micronaire, elongation, uniformity, and strength were different among cultivars, but not between nematicide treatments. Fiber length (UHM; Upper-Half Mean) was different among cultivars and was higher in the aldicarb-treated plots in both years. Numbers of Meloidogyne incognita second stage juveniles and eggs extracted from soil samples were lower in the aldicarb-treated plots in July, but not at harvest, both years. Population densities of M. incognita were not different among cultivars, except the mid-season sample in 1995.
对八个棉花品种进行了评估，这些品种有的经过涕灭威处理，有的未经过处理，以研究它们对棉花根结线虫 - 枯萎病复合病害严重程度的影响。试验采用随机完全区组设计，处理采用裂区排列，棉花品种为主区，杀线虫剂处理为副区。1994年和1995年的结果相似。两年间，各品种以及杀线虫剂处理之间，皮棉产量、铃重、枯萎病和根瘤评级均存在差异。涕灭威的施用与皮棉产量和铃重增加以及根瘤和枯萎病评级降低有关。1994年，涕灭威的施用与皮棉百分率增加有关，但1995年并非如此。各品种间纤维马克隆值、伸长率、均匀度和强度存在差异，但杀线虫剂处理之间无差异。纤维长度（上半部平均长度）在各品种间存在差异，且两年中涕灭威处理区的纤维长度均较高。7月时，涕灭威处理区从土壤样品中提取的南方根结线虫二龄幼虫和卵的数量较少，但两年收获时并非如此。除1995年的中期样本外，各品种间南方根结线虫的种群密度无差异。
