International Journal of Agronomy / 2012 / Article / Tab 7

Research Article

Cotton (Gossypium hirsutum) Cultivars Exhibiting Tolerance to the Reniform Nematode (Rotylenchulus reniformis)

Table 7

Seed cotton yields in plots with or without nematicide treatment and associated tolerance indices (TI) in a field study at the Delta Research and Extension Center in Stoneville, MS, in 2006 and 2007; data are averaged across four fields.

CultivarSeed cotton yield (kg/ha)tTIv
No nematicide Nematicide applicationu

Croplan Genetics 3520 B2RF2647.2aw2896.9a92.5bx
Deltapine 20B2339.0a2374.1a111.9a
Deltapine 445 BG/RRy2564.0b2872.8a
Deltapine 449 BG/RR2493.6b2814.5a
Deltapine 455 BG/RR2370.4b2561.1a
Deltapine 488 BG/RR2226.9a2486.5a92.1b
DES 119z2045.1a2074.3a100.4ab
DynaGrow 2520 B2RF2623.2a2679.4a100.7ab
Fibermax 960 B2R2164.3a2298.2a99.3b
Phytogen 370 WR2723.1b2982.7a
Phytogen 485 WRF2697.1b2899.4a
Stoneville 5242 BR2840.3a2912.1a99.4b
Stoneville 5599 BR2329.4a2448.4a97.8b

tSeed cotton yield taken from the middle two rows of subplots.
uAldicarb applied in furrow at planting (0.84 kg a.i./ha) plus side dress application at pinhead square (1.17 kg a.i./ha).
vTI = tolerance index = [(seed cotton yield in nontreated plot)/(seed cotton yield in nematicide-treated plot)]*100; values listed only for cultivars meeting tolerance criteria.
wFor each cultivar, mean seed cotton yields followed by the same letter are not significantly different from each other at the 0.05 level based on ANOVA.
xMeans followed by the same letter in the TI column are not significantly different at the 0.10 level based on differences of least squares means.
yControl cultivar with respect to yield.
zTolerant control.