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.

Cultivar	Seed cotton yield (kg/ha)^t				TI^v
	No nematicide		Nematicide application^u
Croplan Genetics 3520 B2RF	2647.2	a^w	2896.9	a	92.5	b^x
Deltapine 20B	2339.0	a	2374.1	a	111.9	a
Deltapine 445 BG/RR^y	2564.0	b	2872.8	a
Deltapine 449 BG/RR	2493.6	b	2814.5	a
Deltapine 455 BG/RR	2370.4	b	2561.1	a
Deltapine 488 BG/RR	2226.9	a	2486.5	a	92.1	b
DES 119^z	2045.1	a	2074.3	a	100.4	ab
DynaGrow 2520 B2RF	2623.2	a	2679.4	a	100.7	ab
Fibermax 960 B2R	2164.3	a	2298.2	a	99.3	b
Phytogen 370 WR	2723.1	b	2982.7	a
Phytogen 485 WRF	2697.1	b	2899.4	a
Stoneville 5242 BR	2840.3	a	2912.1	a	99.4	b
Stoneville 5599 BR	2329.4	a	2448.4	a	97.8	b

^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.