Table 2.

Estimated parameters [95% confidence intervals] of the logistic growth model of the progression of disease symptom severity in tomato plants agroinoculated with PepYVMLV and TYLCV-IL DNA-A in single or mixed inoculation with PepYVMLV DNA-B.

Virusa	Parameter estimates for the logit model
	A	B	1 + C
PepYVMLV DNA-A + DNA-B	0.53 [0.46–0.60]	14.46 [14.17–14.74]	8.94 [8.74–9.13]
TYLCV-IL DNA-A	0.38 [0.30–0.46]	16.85 [16.20–17.50]	8.09 [7.69–8.49]
TYLCV-IL DNA-A + DNA-B	0.39 [0.30–0.49]	16.89 [16.17–17.62]	7.85 [7.41–8.29]

A: Slope of the linear phase at the inflection point of the logistic disease progression curve.

B: Time to reach 50% of the symptom severity at the plateau phase.

1 + C: Maximum symptom severity at the final plateau.

^aFor PepYVMLV DNA-A alone, symptom severity does not show a logistic progress curve (see Fig. 2a); thus, parameters A, B and C cannot be calculated in this case.