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

Table 2

Significance levels for main effects and their interactions for early and late season reniform nematode reproductive indices (RI), seed cotton yield, and tolerance index (TI) in a field study at the Delta Research and Extension Center in Stoneville, MS, in 2006 and 2007.

Main effect^v	Early season RI^w	Late season RI^x	Seed cotton yield^y	TI^z
Cultivar (C)	0.0357	0.3410	<0.0001	0.0821
Field (F)	0.0038	0.0092	<0.0001	0.0005
𝐶×𝐹	0.1824	0.3114	0.0014	0.1874
Nematicide (𝑁)	0.0594	0.4338	<0.0001	—
𝑁×𝐹	0.3922	0.6995	<0.0001	—
𝐶×𝑁	0.5128	0.7363	0.3237	—
𝐶×𝑁×𝐹	0.1937	0.2647	0.4574	—

^vFixed effects are the main effects of cultivar (C) and nematicide (𝑁) and all interactions of those main effects; random variables are field (𝐹), 𝐶×𝐹, 𝑁×𝐹, and 𝐶×𝑁×𝐹.
^wEarly season RI = Pm/Pi = (midseason reniform nematode count)/(planting reniform nematode count).
^xLate season RI = Pf/Pm = (harvest reniform nematode count)/(planting reniform nematode count).
^ySeed cotton yield taken from the middle two rows of subplots.
^zTI = [(seed cotton yield in nontreated plot)/(seed cotton yield in nematicide-treated plot)]*100.